Polymer Bulletin最新文献

{"title":"Electrospun silver chloride-loaded PVA nanofibers as a potential antibacterial and electroconductive scaffold for the management of wound infection and healing","authors":"Morteza Abazari, Ali Sharafi, Maryam Hassan, Hamid Reza Moghimi, Sina Andalib, Azadeh Ghaffari","doi":"10.1007/s00289-024-05405-8","DOIUrl":"https://doi.org/10.1007/s00289-024-05405-8","url":null,"abstract":"<p>Recently, designing and fabricating effectual wound dressings have gained a great deal of interest for the proper management of wound infections and biofilms. The present study is focused on the fabricating and characterizing silver chloride-loaded polyvinyl alcohol nanofibers as antibacterial and conductive wound dressing scaffold by electrospinning technique. Polyvinyl alcohol was subjected to the electrospinning process, and silver chloride was incorporated within PVA nanofibers via in situ reaction between silver nitrate and sodium chloride during the fiber-forming process. The obtained silver-free and silver chloride-containing nanofibers were characterized by different techniques, including scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermal gravimetric analysis (DSC and TGA), etc. The gravimetric method and tensile testing were used to determine the porosity and mechanical properties of the fabricated nanofibers. The nanofiber’s in vitro degradation, swelling, and water retention properties were assessed, and their drug loading and release profiles were evaluated by the atomic absorption spectrometry (AAS) method. The wound healing characteristics of the obtained nanofibers, such as antibacterial activity, hemocompatibility, electrical conductivity, and cytotoxicity were evaluated in vitro. The results of this study confirmed that the silver chloride-containing nanofibers exhibit desired physicochemical, morphological, and mechanical properties and could be considered as a potential wound dressing for the management of infectious wounds. On the other hand, the obtained nanofibers showed higher hemocompatibility (less than 5% hemolysis ratio) and cell viability (over 80% after 48 h) as well as appropriate antibacterial activity against two representative strains of Gram-positive and Gram-negative bacteria.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141609293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of activated carbon nanoparticles (ACNPs) on characterization and mechanical properties of polyethersulfone (PES) ultrafiltration membranes","authors":"Mayada Hasheesh, Emad F. El-Kashif, Alaa Mohamed, Modar Saood","doi":"10.1007/s00289-024-05399-3","DOIUrl":"https://doi.org/10.1007/s00289-024-05399-3","url":null,"abstract":"<p>Membrane technologies have developed as one of the main contributors to the resolution of water-related problems. This study seeks to examine the impact of active carbon nanoparticles (ACNPs) on the characterization and mechanical properties of polyethersulfone (PES) ultrafiltration membranes. The PES-AC composites were prepared using the phase inversion technique with a doctor blade by including ACNPs at varied weight percentages (0.01, 0.02, 0.03, 0.04 wt%). Produced membranes were characterized using FTIR, TGA, SEM, and XRD techniques, and the mechanical properties were evaluated using a tensile test, following the guidelines of the ASTM 638M-3 standard, utilizing a uniaxial universal testing machine. SEM images reveal that PES pure membranes consist of a porous bulk layer and dense skin layer. The addition of ACNPs decreased the pore size of the membranes with total thickness varying from 140 to 150 μm. Fourier-transform infrared spectroscopy (FTIR) indicated that with increasing ACNPs concentration, the peak intensities are related to C–C stretching bonds and acidic C–O groups. The XRD analysis showed that with higher ACNPs loading, there are a decrease in the amorphous phase of mixed matrix membranes (MMMs) and the highest intensity (2<i>θ</i> = 12.99°) at 2% ACNPs concentration. The tensile strength of the MMMs increased and reached an ideal value of 3.386 MPa when loaded with 2% ACNPs. Also, the optimum rate of tensile strain with 40% enhancement was achieved with 2% ACNPs compared with the pristine PES membrane.</p>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flow enhanced high-filled polyamide composites without the strength-flowability trade-off","authors":"Daeyul Kwon, Seung-Kyu Park, Youngjae Yoo","doi":"10.1007/s00289-024-05419-2","DOIUrl":"https://doi.org/10.1007/s00289-024-05419-2","url":null,"abstract":"<p>Polyamide (PA) composites exhibit excellent properties such as stiffness, impact resistance, chemical resistance, and thermal stability, making them widely used in automotive interiors, engine parts, and bodywork. To leverage these advantages, high-content composite materials that enhance the wettability and interfacial adhesion between polyamide 66 (PA66) and glass fiber are essential. In this study, we synthesized linear and hyperbranched amide-based flow modifiers to improve the flowability of PA66 composites. H-NMR and FT-IR analyses confirmed the successful preparation of these structures. FT-IR analysis confirmed the successful synthesis of flow modifiers, showing characteristic amide peaks at 1650 cm⁻¹ and the absence of -NH₂ peaks at 3300 cm⁻¹. Five flow modifiers were mixed with PA66 in various ratios using a micro-compounder, and viscosity reduction was confirmed by rotational rheometer measurements. Tensile strength and DMA indicated that PA66 composites with flow modifiers showed improved mechanical properties without significant reduction. Notably, PA66 composites with ACDA exhibited a superior viscosity reduction effect while maintaining mechanical strength. The DMA results indicated that the mechanical properties of PA66 composites with flow modifiers showed no significant reduction. The tensile strength of samples with flow modifiers ranged from 208 to 212 MPa, and the elongation at break was between 8.94 and 9.18%. These findings demonstrate that the synthesized flow modifiers improve the viscosity of PA66 composites while maintaining or enhancing mechanical properties.</p>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141609297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing porous electrodes through carbon activation of palm shell with gel activating agent","authors":"Senthil Kumar Kandasamy, R. Ramyea, S. Tharani, Monika Michalska","doi":"10.1007/s00289-024-05414-7","DOIUrl":"https://doi.org/10.1007/s00289-024-05414-7","url":null,"abstract":"<p>Activated carbon derived from biomass offers several advantages, including high surface area, customizable pore sizes, abundance, resilience across temperatures, and cost-effectiveness. This study focuses on exploring the potential of palm shell as a renewable alternative for supercapacitor electrode materials. Specifically, it investigates the utilization of a gel composed of NaOH and PVA for activating carbon. Here, palm shell undergoes chemical activation, and its resulting activated carbon’s structural and physicochemical properties are comprehensively examined using XRD, FTIR, and BET measurements. The investigation delves into the electrochemical properties using cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy of electrodes fabricated from chemically activated carbon derived from palm shells. The activated carbon enhanced a surface area of 216.062 m² g⁻¹ and a pore volume of 0.1468 cm³ g⁻¹, and it is produced through the innovative approach of gel-based activation. This research highlights the potential of palm shell-derived activated carbon as a viable, sustainable, and efficient material for supercapacitor electrodes.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141585815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polycaprolactone, clay and vanadium oxide nanocomposites: development and performance evaluation","authors":"Vinicius Oliveira Aguiar, Maria Inês Bruno Tavares","doi":"10.1007/s00289-024-05396-6","DOIUrl":"https://doi.org/10.1007/s00289-024-05396-6","url":null,"abstract":"<p>In the present work, the development of nanocomposites was carried out by processing the nanofillers viscogel clay B8 and vanadium oxide with the polycaprolactone (PCL) matrix, through a twin-screw extruder. The evaluation of the nanomaterial obtained by X-ray diffraction technique showed that the addition of nanoparticles caused change in the crystallization process and in the crystallinity index, due to the action of them as a nucleating agent. Evaluation of thermogravimetric analysis, it was observed an increase in the thermal stability of nanocomposites containing clay. Analyzing the SEM micrographs, it was observed that there was a good dispersion and distribution of nanofillers in the matrix. The differential scanning calorimetry and X-ray diffraction technique, showed the possibility of nanoparticles are acting as a nucleating agent, in some mixtures there was change in the values of crystallinity index. Through nuclear magnetic resonance analysis, it was evaluated a good homogeneity of the nanofiller in the matrix due to the intermolecular interaction promoting a better dispersion and distribution of the nanoparticle in the polymer.</p>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141609296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of reinforcing polymeric material with recycled sugarcane bagasse wastes as fiber natural reinforcement","authors":"D. Saber, M. A. El-meniawy, A. H. Abdelnaby, A. M. Abdelhaleim","doi":"10.1007/s00289-024-05409-4","DOIUrl":"https://doi.org/10.1007/s00289-024-05409-4","url":null,"abstract":"<p>In the present work, sugarcane bagasse (SCB) fibers were used as natural reinforcement to low-density polyethylene matrix to benefit from and get rid of unexploited Egyptian natural resources in bio-composites applications. The samples were prepared by injection molding processes using various fiber content (10 wt%, 20 wt% and 30 wt%). The fibers were treated chemically with 3% sodium hydroxide (NaOH) to improve compatibility and adhesion with the matrix. Maleic anhydride was added as a coupling agent to improve interfacial adhesion. The mechanical properties such as tensile and flexural tests were performed according to ASTM standards. The chemical resistance of fabricated composites was also examined. The results indicated that the alkali treatment modified the fiber surface and increased the interaction between the fiber and the matrix. They also showed that adding the coupling agent improved the interfacial adhesion between the fibers and the polyethylene. Additionally, the results showed that the maximum improvement of the fabricated composites with various fiber loadings was found at the 30 wt% treated coupled composites with tensile strength (17.5 MPa) and flexural (19.6 MPa). This reflected an enhancement in tensile strength by 41% and flexural strength by 72% at 30 wt% fiber compared to the neat polymer, respectively. The results also indicated that chemical resistance decreased with increasing fiber content. But it was found that the chemical resistance for aqueous solution 3.5 wt% Nacl was enhanced when the coupling agent was used. The greatest improvement in the resistance was observed for coupled treated SCB composite, followed by coupled untreated SCB composites. This reflected that the addition of maleic anhydride (MAPE) along with the composites improved the chemical resistance of the composites for aqueous solution 3.5 wt% Nacl.</p>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of SrAl2O4: Eu, DY @ polymer composite membrane using eugenol as a cross-linking agent to minimize nanoparticle agglomeration","authors":"Yurong Chen, Xue Zhan, Shuo Hong, Dehui Yuan, Jiaming Liang, Wenyu Li, Zefeng Wang","doi":"10.1007/s00289-024-05415-6","DOIUrl":"https://doi.org/10.1007/s00289-024-05415-6","url":null,"abstract":"<p>Long afterglow nanoparticles, a type of luminescence material, may gradually release stored light energy even after the excitation light has stopped. The modification of polymer membranes by introducing long afterglow nanoparticles via an inorganic particle mixtures, broaden their uses in biomedicine field. In this study, a new membrane modification approach was employed to reduce the loss of physical–mechanical performance, caused by inherent strontium aluminate inorganic particle aggregation. Moreover, eugenol, a cross-linking agent, was used to interact with acrylate monomers to form locally cross-linked compounds using an ex situ approach that improves strontium aluminate particle dispersion. Furthermore, the soap-free emulsion polymerization method used, regulates the degree of cross-linking in the membrane, hence addressing nanoparticles agglomeration. Results showed that the cross-linked structure of the membrane produced improves the heat stability and the hydrophobicity of the material produced while also increasing the nanoparticles dispersion as evidenced by the XRD study. Nevertheless, membranes with cross-linking agents outperformed in water droplet trials by not breaking or whitening the droplets. Furthermore, the generated membranes exhibit high antibacterial activity, making them attractive for paramedical applications such as protective membranes applied on the top of the skin or on the surface areas of sensors, microneedles and metal fasteners.</p>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing multi-micro/nanolayer polymers: synthesis, characterization, and impact of modified clay in ABS/PA6 blends","authors":"Souad Nekhlaoui, Radouane Boujmal, Marya Raji, Hamid Essabir, Mohammed Ouadi Bensalah, Rachid Bouhfid, Abou el kacem Qaiss","doi":"10.1007/s00289-024-05408-5","DOIUrl":"https://doi.org/10.1007/s00289-024-05408-5","url":null,"abstract":"<p>This study focuses on utilizing montmorillonite (MMT) to induce a multi-micro/nanolayer morphology in PA6/ABS blend polymers by mitigating phase retraction and coalescence. Both untreated and modified MMT were incorporated at weight contents ranging from 1 to 5 wt% to manipulate morphology through selective localization at the interface. The nanocomposites' morphology was analyzed, and the cooperative effects were correlated with their structural, thermal, rheological, and mechanical characteristics. Structural analysis revealed that intercalation resulted in the appearance of novel bands, particularly in CTAB-modified MMT, which adopted a tilted monolayer arrangement. SEM results demonstrated excellent distribution and dispersion of exfoliated modified MMT, effectively suppressing coalescence and promoting a finer multilayer morphology. Compared to nanocomposites based on unmodified MMT, the ones based on CTAB-modified MMT exhibited superior thermal stability. Furthermore, the stiffness of the blend matrix increased with clay content, and the nanocomposites stabilized with modified MMT showed enhanced strain-to-failure properties.</p>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation and characterization of chitin and chitosan from different parts of desert locust (Schistocerca gregaria)","authors":"S. Elkadaoui, J. Desbrieres, Y. El Hachimi, A. Hamdaoui, A. Tolaimate","doi":"10.1007/s00289-024-05411-w","DOIUrl":"https://doi.org/10.1007/s00289-024-05411-w","url":null,"abstract":"<p>In this work, chitin was extracted using a single step of deproteinization from the whole locust and its different morphological parts (thorax, legs, abdomen, head and wings). All chitins present an α structure with contents of 10 to 12% and high degrees of acetylation (DA) (92–96%). Physicochemical differences are observed among the chitins from the different parts, particularly in terms of crystallinity indexes (54–72%), molar masses Mv (537,000–672,000 g·mol⁻¹) and surface morphology (fibrous or porous). The N-deacetylation of chitins from the different parts was carried out using KOH in an anhydrous medium (Broussignac process). Other tests using NaOH in an aqueous solution (Kurita process) were also applied to the chitin from the legs. The results show that it is possible to valorize the desert locust by preparing highly deacetylated chitosan (4–14%) with remarkably low to relatively high Mv (11,000–123,000 g·mol⁻¹), depending on the process used.</p>","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of antibacterial properties and sustained release of Centella Asiatica extract from Fe-MOF-reinforced gelatin-based hydrogels","authors":"Sepideh Hezari, Ali Olad, Azita Dilmaghani","doi":"10.1007/s00289-024-05416-5","DOIUrl":"https://doi.org/10.1007/s00289-024-05416-5","url":null,"abstract":"<p>The goal of this study is to investigate the antibacterial activity and sustained release of Centella Asiatica (CA) extract loaded in gelatin-based hydrogels, reinforced with MIL-53(Fe) (Fe-MOF) for the potential use as wound dressing. To induce antibacterial activity to the designed wound dressing, CA-extract was incorporated within the nanocomposite hydrogels. FT-IR analysis showed the distinctive peaks related to the Fe-MOF and CA-extract, with little shift, for hydrogel samples, which confirm the successful synthesis of nanocomposite hydrogels containing Fe-MOF and CA-extract. GC-mass analysis showed the antibacterial potential for CA-extract because of the presence of phenol, caryophyllene, and propanoic acid. SEM micrograph demonstrates the presence of Fe-MOF enhancing the porous of hydrogels. The antibacterial activity of prepared nanocomposite hydrogels was investigated by disk diffusion method revealing the significant inhibition zone growth for <i>Basillus</i>, <i>Staphylococcus</i>, and <i>Streptococcus</i>, as gram-positive and <i>E. coli</i>, <i>Klebsiella</i>, and <i>P. aeruginosa</i> as gram-negative bacteria and the \"<i>Candida albicans</i> as fungi. Also, the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined by the micro-broth dilution method. The results showed that the nanocomposite hydrogel has a MIC values of 3.125 mg/ml and 6.25 mg/ml against both groups of bacteria. Cytotoxicity results obtained from MTT tests showed that the prepared hydrogels are biocompatible. The immunohistochemistry-stained hydrogel images revealed that the growth of cells on the CA-extract containing hydrogels was significantly increased in comparison to neat hydrogels.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":737,"journal":{"name":"Polymer Bulletin","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}