Journal of Vinyl and Additive Technology最新文献

{"title":"Experimental characterization for uniaxial tensile properties of high‐performance TX30 polyesters","authors":"Longlong Chen, Chengjun Gao, Wujun Chen","doi":"10.1002/vnl.22152","DOIUrl":"https://doi.org/10.1002/vnl.22152","url":null,"abstract":"<jats:label/>Coated fabric is a composite textile consisting of fiber‐based cloth and surface coating. It features advantages such as lightweight, high strength, and multifunctionality, making it highly popular in architectural membrane structures. However, conventional coated fabrics have been facing bottlenecks such as short service life, difficult maintenance, and low dimensional stability. This paper introduces an innovative high‐performance PVC coated polyester named Flexlight Xtrem TX30, which possesses excellent longevity and durable aesthetics. The uniaxial tensile properties of three types of TX30 polyesters in the warp, weft, and 45° directions were comprehensively revealed through monotonic and cyclic tests. First, mono‐uniaxial tensile tests were performed on six specimens for each case. The failure characteristics were observed and strength at different angles was determined. Benefiting from the precontraint technology, the difference in strength between the warp and weft directions for TX30 is less than 5%. Second, uniaxial cyclic tensile tests were conducted on four specimens for each case. The initial tensile behavior exhibited the highest nonlinearity, with an R‐squared value greater than 0.999 for the cubic stress–strain relation. By the 15th cycle, the stiffness increment for all cases is less than 1%, indicating the attainment of material stabilization. Additionally, ratcheting effect and hysteresis loops were observed during the tests. The ratcheting strain and dissipated energy across different cases were thoroughly discussed and compared. In general, the experimental investigations in this study facilitate the understanding of the mechanical characteristics of the novel TX30 polyesters, providing insights for engineering applications and academic research.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>The uniaxial tensile properties of innovative TX30 polyesters were investigated.</jats:list-item> <jats:list-item>The failure mechanism and tensile strength at different angles were identified.</jats:list-item> <jats:list-item>The nonlinear stress–strain relations and cyclic material behaviors were determined.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The role of nano‐Fe2O3 crystal structure on the thermal stability, flame retardancy, and smoke suppression of intumescent flame‐retarded epoxy resins","authors":"Zheng Wei, Jingjing Guan, Long Yan, Guoqing Niu","doi":"10.1002/vnl.22155","DOIUrl":"https://doi.org/10.1002/vnl.22155","url":null,"abstract":"<jats:label/>Nano‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> is well known to has a synergistic effect with intumescent flame retardants in reducing the fire hazard of polymeric materials, but the role of nano‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> geometry on the synergistic effect of the intumescent system has not been thoroughly investigated. In this study, a series of pentaerythritol phosphate melamine salt (PPMS)‐grafted iron oxide with different crystal configurations (PPMS‐α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and PPMS‐γ‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>) were successfully synthesized. The role of nano‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> geometry on the thermal stability, flame retardancy, and smoke suppression of intumescent flame‐retarded epoxy resins (EP) was investigated by thermogravimetric analysis, cone calorimeter test, and smoke density test. The results showed that PPMS‐α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> flame retardant substantially improved the thermal stability and char formation of intumescent flame‐retarded EP compared to PPMS‐γ‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> flame retardant. Additionally, α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> exerts a better role in improving the flame retardancy and smoke suppression properties compared to that of γ‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>. It is notable that the incorporation of 5 wt% α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> as a flame retardant confers a 78.9% reduction in peak heat release rate (PHRR) value and an 81.8% reduction in peak smoke production rate (PSPR) value compared to pure EP. Char residue analysis revealed that α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> performs positively in enhancing the compactness of the char layer, thereby leading to an improved synergistic flame retardant effect.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>Successful synthesis of flame retardants (PPMS‐α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and PPMS‐γ‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>).</jats:list-item> <jats:list-item>α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and PPMS have superior synergistic flame retardant effect.</jats:list-item> <jats:list-item>α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> remarkably enhances thermal stability and char formation of EP.</jats:list-item> <jats:list-item>Compared to γ‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>, α‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> contributes more to the smoke suppression of EP.</jats:list-item> <jats:list-item>Designing improved EP fire performance based on the role of nano‐Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Use of modifiers ZSM‐5 and bentonite enhancing the hydrolytic and thermal stability of urea‐formaldehyde composites","authors":"Mirjana Ristić, Suzana Samaržija‐Jovanović, Marija Krstić, Tijana Jovanović, Vojislav Jovanović, Gordana Marković, Milena Marinović‐Cincović","doi":"10.1002/vnl.22153","DOIUrl":"https://doi.org/10.1002/vnl.22153","url":null,"abstract":"<jats:label/>This research introduces a new approach using zeolite ZSM‐5 (Z) as formaldehyde (FA) scavenger in urea‐formaldehyde (UF) resins, while simultaneously investigating and comparing the structural influence of Z and bentonite (B) on different properties of UF composite. ZSM‐5 and bentonite were used to modify the in situ synthesized UF resin with a low formaldehyde/urea (FA/U) molar ratio (0.8), to reduce the free FA content in the UF resin. The fillers and modified UF composites were characterized using XRD, FTIR, TGA, DTG, and DTA. The surface of fillers and modified UF resins was observed using SEM. The content of free FA, determined by the sulfite method, for the sample UF/Z composite, was 0.06%, while for the sample UF/B composite was 0.18%. After acid hydrolysis, the content of released FA was similar for both modified resins (4.08% for UF/Z and 4.80% for UF/B). This slight difference indicates a better hydrolytic stability of UF/Z. Analysis of thermal stability showed that UF/Z starts to degrade at a higher temperature, which, together with the values of released FA, indicates that UF resin modified with ZSM‐5 is thermally and hydrolytically more stable compared to the UF/B composite. The obtained results suggest that ZSM‐5 with its microporous structure contributes better to improving the properties of UF resins than bentonite with its layered structure.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>Synthesis of UF resins modified with ZSM‐5 and bentonite.</jats:list-item> <jats:list-item>New approach using ZSM‐5 as a formaldehyde scavenger.</jats:list-item> <jats:list-item>Comprehensive characterization of the fillers and modified UF resins.</jats:list-item> <jats:list-item>UF/Z resin has superior hydrolytic and thermal stability over UF/B resin.</jats:list-item> <jats:list-item>The microporous structure of ZSM‐5 enhances the properties of UF.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of melt‐processing conditions on the electrical conductivity and microwave absorbing properties of composites based on clean scrap poly(vinylidene fluoride/ethylene vinyl acetate copolymer and graphene nanoplatelets","authors":"Debora P. Schmitz, Beatriz S. Cunha, Bluma G. Soares","doi":"10.1002/vnl.22156","DOIUrl":"https://doi.org/10.1002/vnl.22156","url":null,"abstract":"<jats:label/>Clean scrap polyvinylidene fluoride (rPVDF) from industrial reject was compounded with ethylene vinyl acetate (EVA) copolymer and graphene nanoplatelets (GNP) to produce low cost and scalable conductive composites. The effect of the melt processing conditions (temperature, time, and rotor speed) on the electrical conductivity and microwave absorbing (MWA) properties was investigated. All systems presented co‐continuous morphology indicated by scanning electron microscopy (SEM) and selective extraction experiments. The preferential localization of GNP in the EVA phase was evidenced by selective extraction and thermogravimetric analysis (TGA). Higher conductivity value was observed for the composite processed at 210°C for 3 min at a rotor speed of 200 rpm. The MWA performance of monolayer and bilayer composite structures with 2 mm thickness was investigated in terms of minimum reflection loss (RL) and effective absorption bandwidth (EAB). The bilayer system provided the best MWA response with RL = − 43.1 dB (&gt;99.99% of EM attenuation) when prepared at 190°C for 3 min at a rotor speed of 200 rpm. The ecological and environmental importance of finding new applications for plastic waste, and the low cost of the materials and processing make this composite an interesting candidate for MWA purpose.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>Promising application of clean scrap polyvinylidene fluoride (PVDF) in microwave absorbing materials;</jats:list-item> <jats:list-item>Conductivity and absorbing performance are affected by processing conditions;</jats:list-item> <jats:list-item>Co‐continuous structure of rPVDF/EVA blend influenced by graphene nanoplatelets (GNP);</jats:list-item> <jats:list-item>Selective localization of GNP in EVA phase;</jats:list-item> <jats:list-item>Outstanding microwave absorption properties achieved with bi‐layer structure.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing flexibility and durability of PVC with liquid epoxidized natural rubber: Innovative UV treatment to mitigate plasticizer migration","authors":"Jin Jing Liew, Nurul Hayati Yusof, Desmond Teck‐Chye Ang","doi":"10.1002/vnl.22147","DOIUrl":"https://doi.org/10.1002/vnl.22147","url":null,"abstract":"<jats:label/>This manuscript elucidates the preparation and utilization of liquid epoxidized natural rubber (LENR) with 50 mol% epoxidation level (LENR50) as a polymeric plasticizer for poly(vinyl chloride) (PVC), and further immobilization of the plasticizer in the plastic matrix through subsequent ultraviolet (UV)‐curing treatment. The plasticizing effect induced by LENR50 at 50 wt% loading was evident with a reduction of <jats:italic>T</jats:italic><jats:sub>g</jats:sub> from a high of 72.0 to 11.4°C. Positive enhancements were also documented in the mechanical properties of the LENR50‐plasticized PVC, specifically the big improvement in elongation at break and elastic modulus, from 106% to 430%, and from 646 to 7 MPa, respectively. The UV‐treated PVC/LENR film also exhibited superior resistance to migration compared with formulations with conventional plasticizers such as di‐2‐ethylhexyl phthalate (DEHP) and triethyl‐2‐acetyl citrate (ATEC). A similar outcome was recorded in the leaching resistance test, where LENR50 had the best resistance to leaching in four different solvents (water, soap solution, ethanol, and toluene). The LENR50‐plasticized PVC film recorded the lowest weight loss following 24 h immersion in both hydrophilic and lipophilic solvents. The findings from this study suggest that LENR50 could serve as an efficient bio‐based polymeric plasticizer for PVC.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>LENR as bio‐based polymeric plasticizer for PVC.</jats:list-item> <jats:list-item>Significant reduction in <jats:italic>T</jats:italic><jats:sub>g</jats:sub> and elastic modulus of PVC plasticized with LENR.</jats:list-item> <jats:list-item>UV treatment improved tensile strength and elongation at break of LENR/PVC film.</jats:list-item> <jats:list-item>UV‐treated PVC/LENR has superior plasticizer migration and leaching resistance.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sulfated cellulose nanocrystal isolated from waste cotton fabrics by deep eutectic solvent and its application in polymer nanocomposite films","authors":"Lebin Zhao, Yutong Zhang, Yu Pan, Chaohong Dong, Xiujuan Huang, Gangqiang Zhang, Kaitao Zhang","doi":"10.1002/vnl.22154","DOIUrl":"https://doi.org/10.1002/vnl.22154","url":null,"abstract":"<jats:label/>The growing utilization of textiles raises concerns about the ecological hazards of textile production methods and discarded textiles. The recycling and reusing of waste cotton materials align with the sustainable development of society. In this study, sulfated cellulose was synthesized by sulfating waste cotton using a deep eutectic solvent (DES). After nanofibrillation with ultrasonication, sulfated cellulose nanocrystal (SCNC) with an average width of 10.83 nm and an average length of 129.40 nm was produced. The thermal properties of the synthesized SCNC were significantly enhanced compared to the pristine cellulose, with a notable reduction of 87.1% in the peak heat release rate, as well as an 86.6% reduction in the total heat release. Additionally, when utilized as a reinforcement in poly(vinyl alcohol) (PVA) films, SCNC demonstrated a substantial rise in yield strength (from 62.3 to 94.8 MPa) and Young's modulus (from 2.7 to 4.4 GPa) of the PVA films. Furthermore, the incorporation of SCNC into composites increased the thermal stability while maintaining the high transparency (with light transmission higher than 84%), which has good potential for application in the electronic packaging field.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>SCNC were successfully prepared from waste cotton using DES.</jats:list-item> <jats:list-item>Extracted S<jats:ext-link xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"https://www.sciencedirect.com/topics/chemistry/cellulose-nanocrystals\">CNC</jats:ext-link> were characterized using TEM, FTIR, XRD, TGA and MCC.</jats:list-item> <jats:list-item>SCNC enhanced the yield strength and thermal stability of PVA composites.</jats:list-item> <jats:list-item>Transparent and mechanically robust PVA‐based nanocomposites were created.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advances in brake friction materials: A comprehensive review of ingredients, processing methods, and performance characteristics","authors":"Vijay Raghunathan, G. Sathyamoorthy, Vinod Ayyappan, Rapeeporn Srisuk, D. Lenin Singaravelu, Sanjay Mavinkere Rangappa, Suchart Siengchin","doi":"10.1002/vnl.22149","DOIUrl":"https://doi.org/10.1002/vnl.22149","url":null,"abstract":"<jats:label/>The crucial significance of brake friction materials lies in ensuring automobile safety and performance. This drives the ongoing development of these materials to meet rigorous criteria. Recent developments in friction materials have improved the effectiveness of braking systems, resulting in increased safety and comfort. Modern society has increasingly adopted environmentally friendly friction materials, replacing conventional alternatives. The advancements in brake friction material development primarily focus on improving braking performance while simultaneously reducing environmental pollution caused by dangerous substances in brake pads. Understanding the different formulations of brake pads and the impact of the materials used is essential due to the complex and expert‐dependent nature of the brake pad manufacturing process. This review aims to fill knowledge gaps surrounding the basic formulations of brake pads and provide insights to researchers on the impact of different ingredients in creating friction brake pads. This research not only highlights the influence of various components on the friction and wear characteristics of brake pads but also addresses the importance of a comprehensive understanding of their fundamentals. The novelty of this review is justified by the lack of up‐to‐date, thorough reviews on brake friction materials, particularly in light of the recent advancements in the field. This review focuses on the developments and innovations in brake friction materials over the last 15 years. It aims to bridge the knowledge gaps regarding the basic formulations of brake pads and provide valuable insights into the influence of various components on their friction and wear characteristics. By addressing both the performance improvements and environmental considerations, this review offers a timely and essential resource for researchers and practitioners in the automotive industry.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>Exploration of various ingredients used in the brake friction composites.</jats:list-item> <jats:list-item>Ingredients influence on the various characteristics of brake friction composites.</jats:list-item> <jats:list-item>Different formulations and its usage in the brake friction composites.</jats:list-item> <jats:list-item>Recycled materials usage in the friction composites‐waste to wealth approach.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antimicrobial and antioxidant functionalization of cellulosic fabric via mushroom and neem oil treatment: A step toward sustainable textiles","authors":"Joykrisna Saha, Most. Refat Ara, Arnob Dhar Pranta, Md. Shebbir Hossain","doi":"10.1002/vnl.22150","DOIUrl":"https://doi.org/10.1002/vnl.22150","url":null,"abstract":"Nowadays, the demand for protective clothing for specific activities has been fueled by consumer's attitudes toward hygiene and their active lifestyles. The aim of the present work is focused on creating protective textiles that are safe for the environment. This study uses mushroom–neem oil and neem oil to test their antioxidant properties to make cotton fabric that resists bacterial growth. Pad dry cure is used to create antimicrobial fabric with mushroom–neem oil and neem oil with citric acid (1%) as a cross‐linking agent. The antibacterial activity against Escherichia coli and antioxidant activity by DPPH assay were assessed by applying mushroom–neem oil and neem oil separately to cotton knitted fabric at 120, 130, 140, and 150°C. FTIR and EDS were used to study the incorporation of mushroom–neem oil and neem oil on cotton fabric surfaces. Both the treated and untreated fabric surface morphology were examined using scanning electron microscopy. An increase in curing temperature was found to change the comfort characteristics of the treated fabric. The analysis also found that antimicrobials reduced thermal conductivity. Most importantly, increasing the curing temperature improved all comfort properties. Notably, fabric treated with mushroom neem oil is more comfortable than fabric treated with neem oil.\u0000Cotton fabrics with mushroom–neem and neem oil showed antibacterial activity.\u0000Neem oil‐treated fabrics had better antioxidant properties than mushroom–neem oil.\u0000Higher curing temperatures reduced thermal conductivity and improved comfort.\u0000Mushroom–neem oil samples have superior physical properties.\u0000Bioactive material treatments can reduce chemical and environmental impact.\u0000","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141924125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication and dielectric spectroscopy analysis of FeGaInS4/PVA composite materials","authors":"Zeynab Addayeva, Yashar Azizian‐Kalandaragh, Namiq Niftiyev, Goncha Eyvazova, Faik Mammadov, Mahammad Babanly, Mahammad Baghir Baghirov, Mustafa Muradov","doi":"10.1002/vnl.22148","DOIUrl":"https://doi.org/10.1002/vnl.22148","url":null,"abstract":"<jats:label/>The control of dielectric permittivity and conductivity is a crucial factor in the development of certain electronic components. Materials based on layered structures and polyvinyl alcohol (PVA) show great potential for applications in supercapacitors. Therefore, the creation of polymer composites based on layered semiconductors and the determination of their physical properties is significant. In this investigation, a composite comprising 1 wt% FeGaInS<jats:sub>4</jats:sub> dispersed in PVA was synthesized through mechanical mixing, where the FeGaInS<jats:sub>4</jats:sub> crystal was incorporated into the PVA matrix. This study explores the physical characteristics of this composite for the first time. The structure of the composite was analyzed using x‐ray diffraction (XRD). Electrical properties and conductivity mechanisms were examined using a dielectric spectrometer. It was determined that the hopping model conductivity mechanism predominates in the FeGaInS<jats:sub>4</jats:sub>/PVA nanocomposite. For the 1 wt% FeGaInS<jats:sub>4</jats:sub>/PVA composite, system parameters were calculated at a temperature of 313 K and a frequency of 5 × 10<jats:sup>3</jats:sup> Hz. The parameters found are <jats:italic>s</jats:italic> = 0.814, potential barrier height <jats:italic>W</jats:italic><jats:sub>M</jats:sub> = 0.868 eV, hopping length <jats:italic>R</jats:italic><jats:sub>ω</jats:sub> = 14.7 × 10<jats:sup>−10</jats:sup> m, and the concentration of pairs of states between, which charge carriers hop <jats:italic>N</jats:italic> = 1.396 × 10<jats:sup>26</jats:sup> m<jats:sup>−3</jats:sup>.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>1 wt% FeGaInS4 composite synthesized via mechanical assembly.</jats:list-item> <jats:list-item>Small crystals boost dielectric constant by 1.5× via interfacial polarization.</jats:list-item> <jats:list-item>The system parameters are defined: <jats:italic>s</jats:italic> = 0.814, <jats:italic>W</jats:italic><jats:sub>M</jats:sub> = 0.868 eV, <jats:italic>R</jats:italic><jats:sub>ω</jats:sub> = 14.7 × 10<jats:sup>−10</jats:sup> m.</jats:list-item> <jats:list-item>Electrical conduction is multifaceted; conductance hopping dominates.</jats:list-item> <jats:list-item>Loss tangent decreases due to interfacial polarization effects.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and characterization of a designed poly(ionic liquid‐modified graphene oxide) nanocomposite: Evaluation of nitrate removal from water and antimicrobial properties","authors":"S. Mojtaba Amininasab, Mona Nasseri, Bita Soleimani, Marjan Hassanzadeh, Zahed Shami","doi":"10.1002/vnl.22139","DOIUrl":"https://doi.org/10.1002/vnl.22139","url":null,"abstract":"<jats:label/>Addressing the global challenge of water contamination, this study introduces a novel nanocomposite adsorbent—poly(ionic liquid‐modified graphene oxide) (PIL‐MGO)—designed to remove nitrates efficiently from water and combat microbial threats. Leveraging modified graphene oxide and vinyl imidazolium‐based ionic liquid, this research synthesizes an adsorbent via a facile and cost‐effective approach. The performance of PIL‐MGO was rigorously analyzed through a series of characterizations, including Frontier transform infrared spectroscopy, field emitting scanning electron microscopy, energy dispersive X‐ray spectroscopy, and thermogravimetric analysis, revealing its robust structural composition and thermal stability. In our experimental exploration, the adsorbent showcased a remarkable nitrate removal efficiency of up to 97.53%, under optimal conditions of an initial pH of 5, room temperature, initial nitrate concentration of 30 mg/L, a contact time of 30 min, and an adsorbent dosage of 40 mg, with a significant selectivity for nitrate ions over competing anions. Moreover, regeneration of the adsorbent up to 7 cycles indicated only a marginal decline in adsorption efficiency. Furthermore, PIL‐MGO demonstrated considerable antimicrobial properties against bacteria and fungi, indicating its dual utility in water purification and microbial inhibition. These findings suggest that the synthesized nanocomposite holds great promise for addressing environmental and health‐related challenges posed by water pollutants. This study not only underscores the capabilities of PIL‐MGO but also paves the way for further advancements in adsorbent technologies.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>A novel nanocomposite was synthesized based on vinyl imidazolium ionic liquid and modified graphene oxide.</jats:list-item> <jats:list-item>This newly developed nanocomposite was evaluated as an adsorbent for the removal of nitrate ions from water, demonstrating high removal efficiency.</jats:list-item> <jats:list-item>The adsorbent exhibited notable selectivity for nitrate ions, effectively distinguishing them from competing anions such as chloride, bicarbonate, sulfate, and phosphate.</jats:list-item> <jats:list-item>The adsorption kinetics of the nanocomposite were best described by the pseudo‐second‐order kinetic model, and the adsorption isotherm aligned well with the Langmuir model.</jats:list-item> <jats:list-item>Investigation of the nanocomposite antimicrobial activity displayed considerable inhibitory effects against both bacteria and fungi.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}