Iranian Polymer Journal最新文献

{"title":"Sustainable hybrid nanoparticle reinforced low-density polyethylene: emerging materials for engineering applications","authors":"Sefiu Adekunle Bello,&nbsp;Mohammed Kayode Adebayo,&nbsp;Raphael Gboyega Adeyemo,&nbsp;Patricia Abimbola Popoola","doi":"10.1007/s13726-024-01307-8","DOIUrl":"10.1007/s13726-024-01307-8","url":null,"abstract":"<div><p>Nanoparticles are materials that have diameter/dimension between 1 and 100 nm. The term also covers materials as high as 500 nm in diameter or length. Their emergence has given birth to a new set of nanocomposites with more promising properties than the conventional composites. Moreover, polyethylene products generate wastes. Their managements can create wealth and reduce dependence on the virgin polyethylene for green material productions. In this study, <i>Delonix regia</i> pod and eggshell hybrid nanoparticles, up to 12% (by wt), were incorporated into the low-density polyethylene. Properties of the developed hybrid nanocomposites were investigated and compared with those of the existing automobile dashboard cover material properties in literature. Results obtained from mechanical examinations show 332.77, 179.19, 807.32, 63.61, 4.33, 26.61 and 21.35% increases in tensile strength, percentage elongation, tensile modulus, flexural strength, flexural deflection, flexural energy absorbed and hardness, respectively; with consequent reductions in the flexural modulus and impact energy by respective 4.67 and 4.40% at 4% <i>Delonix regia</i> pod, 6% eggshell particles addition to the virgin low density polyethylene. Maximum impact energy of 25.09 J equal to 16.48% increase was noticed at 4% <i>Delonix regia</i> pod 4% eggshell particle addition to the recycled low-density polyethylene. Virgin low-density polyethylene containing 4% <i>Delonix regia</i> pod, 6% eggshell particles having greater tensile strength and impact energy than each of the existing materials for the automobile dashboard cover is confirmed suitable for both upper and lower layers of the dashboard cover. Hence, 4% <i>Delonix regia</i> pod 6% eggshell particles reinforced virgin low-density polyethylene has 28.39 ± 1.42 Nmm⁻² tensile strength; 1137.42 ± 15 Nmm⁻² tensile modulus; 6.24 ± 0.68% tensile elongation; 21.86 ± 0.9 J impact energy; 69.17 ± 3.51 VHN hardness value; 28.11 ± 0.84 Nmm⁻² flexural strength; 7.42 ± 0.8 flexural deformation; 314.41 ± 20.53 Nmm⁻² flexural modulus and 0.30 J flexural energy.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 7","pages":"965 - 980"},"PeriodicalIF":2.4,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973631","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":"Relaxation spectrum of poly(styrene-b-isoprene-b-styrene) triblock copolymer","authors":"Hengyu Luo,&nbsp;Zihao Shang,&nbsp;Hui Han,&nbsp;Haiqing Hu","doi":"10.1007/s13726-024-01328-3","DOIUrl":"10.1007/s13726-024-01328-3","url":null,"abstract":"<div><p>A relatively complete continuous relaxation spectrum <i>H</i>(<i>τ</i>) of poly(styrene-<i>b</i>-isoprene-<i>b</i>-styrene) (SIS) two-phase system was divided into five regions based on the variation of <i>H</i>(<i>τ</i>) strength, which corresponded to: (1) glass transition of PI phase, (2) high elastic state of PI phase, (3) glass transition of PS phase, (4) high elastic state of PS phase, and (5) viscous flow state of the entire SIS molecular chain. Five regions only appeared in SIS1105, because the molecular of SIS1105 experienced glass transition of PI block, PS block, and viscous flow of the whole molecular chain. The stress relaxation of SIS was influenced by the S/I ratios, because the PS microdomains ultimately determined the relaxation characteristics. The stress relaxation of SIS system was also closely related to the viscous flow transition temperature (<i>T</i>_f). When the S/I ratio was low (15/85), forced stress relaxation occurred; when the S/I ratio was high (29/71 and 45/55), the SIS system did not show stress relaxation below the <i>T</i>_f. When the temperature was higher than the <i>T</i>_f, the S/I ratio did not affect the stress relaxation. The relaxation information obtained from the Cole–Cole diagram further verified the analysis of the continuous relaxation spectrum<i> H</i>(<i>τ</i>) and stress relaxation.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 10","pages":"1411 - 1422"},"PeriodicalIF":2.4,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140935160","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":"CdSe/polyvinyl alcohol nanocomposite films for packaging: thermal, mechanical, optical and physico-chemical properties","authors":"Sandeep Singh,&nbsp;Sangeeta Garg,&nbsp;Amit D. Saran","doi":"10.1007/s13726-024-01320-x","DOIUrl":"10.1007/s13726-024-01320-x","url":null,"abstract":"<div><p>CdSe nanostructures, well-investigated for their optical properties, have been evaluated here as functional fillers in polyvinyl alcohol (PVA) films, for packaging applications. Polymer-nanocomposite films of PVA and CdSe nanoparticles (nanospheres and nanorods), were evaluated for their thermal, mechanical<b>,</b> optical and physico-chemical properties. Microemulsion-synthesized CdSe were loaded in PVA films by solution casting method. CdSe-PVA films were prepared at varying morphology (spherical to rod-like) of CdSe, by controlling the reaction time (0, 2, 4, 6 and 8 h) at 1% (by weight) loading. The effect of loading of CdSe was also studied at 0.1, 0.5, 1, 5, and 10% (by weight) for the reaction time of 4 h. CdSe nanoparticles were characterized by high-resolution transmission electron microscopy (HR-TEM) and X-ray diffractometry (XRD). The melting point and heat of fusion of CdSe-PVA films (for the reaction time of 4 h) exhibited the maximum values of 216.9 ± 0.73 °C and 6.78 ± 0.24 J/g, respectively, at 1% (by weight) of CdSe, as compared with 209.8 ± 0.52 °C and 3.76 ± 0.1 J/g for plain PVA film. The CdSe-PVA films with spherical CdSe showed the maximum enhancement of 118 and 87.4% for Young’s modulus (MPa) and modulus of toughness (MPa), respectively as compared with PVA films. With increasing load of CdSe, the CdSe-PVA films showed an increase in the two moduli with maximum enhancement of 124 and 57 at 10% (by weight) of CdSe, as compared with PVA films. The optical, colorimetric, chemical resistance, UV-hindrance, water content and antibacterial properties of CdSe-PVA films were also investigated.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 9","pages":"1257 - 1275"},"PeriodicalIF":2.4,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140935008","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":"CO2 separation performance and thermo-mechanical characteristics of mixed matrix membranes composed of polyvinylidene fluoride/hyperbranched polyethylenimine embedded with zinc oxide/graphene oxide filler","authors":"Muhammad Waqas Ahmad,&nbsp;Sana Sahar Shiekh,&nbsp;Aneela Sabir,&nbsp;Rafi Ullah Khan","doi":"10.1007/s13726-024-01321-w","DOIUrl":"10.1007/s13726-024-01321-w","url":null,"abstract":"<div><p>Herein, polyvinylidene fluoride (PVDF)/hyperbranched polyethylenimine (HPEI) blend matrix was infused with graphene oxide–zinc oxide (GO–ZnO) filler to fabricate mixed matrix membranes (MMMs). These membranes were investigated by dynamic mechanical–thermal analysis (DMTA), single and binary gas (CO₂/N₂ and CO₂/CH₄) experiments and for anti-plasticization performance. Varying loading fractions [0.1%, 0.3%, 0.5% and 0.7% (by weight)] of as-synthesised GO–ZnO filler were incorporated into the blend matrix (PVDF/HPEI). Utmost consideration was provided to understand the microstructure of MMMs through DMTA and its influence on gas separation performance. Single gas testing revealed that MMMs exhibited ~ 82% improved CO₂ permeability as compared to the control membrane, at 0.5% (by weight) GO–ZnO filler loading. During binary gas experiments, CO₂ permeability increased by 79%, whereas CO₂/N₂ and CO₂/CH₄ selectivity was enhanced by 136% and 142%, respectively. The highly CO₂-phillic amine moieties of HPEI and the polar oxygen-containing moieties on GO sheets augmented the CO₂ diffusivity and sorption. Amongst various membranes, MMMs loaded with 0.5% (by weight) GO–ZnO tested at various pressures (4, 6, 8 and 10 bars) demonstrated the highest inhibitory effect on the CO₂-induced plasticization. DMTA suggested that GO–ZnO created a robust interfacial adhesion with PVDF/HPEI, forming a rigid microstructure that was propitious in resisting pressure-induced plasticization. With a significant boost in thermo-mechanical attributes and CO₂ separation efficiency, GO–ZnO-loaded MMMs suggest intriguing prospects in CO₂ separation applications.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 9","pages":"1277 - 1292"},"PeriodicalIF":2.4,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140935094","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":"Investigating the impact of epoxy Borassus flabellifer fiber-based composites for UAV landing gear","authors":"Tamilselvan Ganesan,&nbsp;Niresh Jayarajan,&nbsp;Devi Ramachandran","doi":"10.1007/s13726-024-01323-8","DOIUrl":"10.1007/s13726-024-01323-8","url":null,"abstract":"<div><p>This study assesses the impact of raw and alkali-treated Borassus Flabellifer (BF) fibers in an epoxy composite. It examines mechanical properties such as tensile strength, elongation, and impact resistance to gauge load-bearing capacity and resilience to sudden forces in “unmanned aerial vehicle” (UAV) landing gear. Attenuated total reflectance for Fourier transform infrared (ATR-FTIR) were taken to confirm the composition of fiber before and after alkali treatment. Scanning electron microscope (SEM) analysis probes the composite microstructure, shedding light on fiber-matrix interaction and overall morphology. Energy dispersive X-ray analysis (EDX) offers insights into elemental composition, aiding comprehension of element distribution and fiber-epoxy matrix interplay. Thermogravimetric analysis (TGA) showed the thermal stability of the prepared epoxy composites. Water absorption properties are evaluated to gauge resistance to moisture, vital for durability in humid or wet conditions. These findings provide vital data on mechanical properties, SEM microstructure, EDX elemental composition, and water absorption for UAV landing gear applications. The comprehensive investigation of deformation results indicated that Borassus Flabellifer (BF) composite performed exceptionally well for UAV landing gear applications, surpassing banana/epoxy, sisel/epoxy, and coir/epoxy composites. With a landing gear deformation of 1.50 mm under 100 N load, these outcomes underscore the potential for enhancing sustainability in UAV designs. The findings of this study can pave the way for the development of more environmentally friendly and sustainable UAVs to address the critical needs of the rapidly growing UAV industry.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 10","pages":"1395 - 1409"},"PeriodicalIF":2.4,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884579","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":"Hybridization of woven kenaf and unidirectional glass fibre roving for unsaturated polyester composite","authors":"Thinesh Sharma Balakrishnan,&nbsp;Mohamed Thariq Hameed Sultan,&nbsp;Farah Syazwani Shahar,&nbsp;Suhas Yeshwant Nayak,&nbsp;Ain Umaira Md Shah,&nbsp;Tamer Ali Sebaey,&nbsp;Adi Azriff Basri","doi":"10.1007/s13726-024-01319-4","DOIUrl":"10.1007/s13726-024-01319-4","url":null,"abstract":"<div><p>This is a study on the mechanical properties of kenaf/glass-reinforced polyester composites intended for use in structural profiles with a wall thickness by max. 6 mm. Mechanical properties such as tensile, compression, bending and interlaminar shear stress were investigated by comparing the hybrid variants with the pure fibreglass variant. According to the study, woven kenaf/unidirectional glass roving (WK/UG) alternate recorded the highest tensile properties among hybrid samples. It demonstrated a decrement of about 8.2% of the tensile strength (404.54 MPa) and 10.7% of tensile modulus (24.54 GPa) compared to conventional fibreglass samples. Alternating WK/UG samples demonstrated higher compressive strength (417.15 MPa) compared to other hybrid specimens, recording a slight decrease at 6.09% compared to pure fibreglass composites. The highest bending properties were also observed in hybrid alternate WK/UG samples among other hybrid laminates with only a decrement of 4.13% in modulus of rupture (456.33 MPa) and 1.9% in modulus of elasticity (14.49 GPa) when compared to the control specimen. The ILSS of hybrid composites 2WK/3UG/2WK (30.97 MPa) and WK/UG alternate (34.90 MPa) showed good agreement with the pure fibreglass (42.33 MPa) composites. Using SEM images, tensile fractured specimens were examined to comprehend composites’ failure mechanism and interfacial adhesion. Overall, woven kenaf/unidirectional glass roving alternate sequence is chosen as a potential alternative in developing structural profiles for moderate load-bearing structural applications. In contrast, 3WK/UG/3WK with a higher kenaf to glass ratio demonstrate potential in low load-bearing structural profile applications.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 9","pages":"1231 - 1244"},"PeriodicalIF":2.4,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13726-024-01319-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced interfacial properties of carbon fibers reinforced epoxy or PP composites using modified graphene oxide with two different polymer brushes","authors":"Haifeng Cui,&nbsp;Qing Zhang,&nbsp;Huihuang Ma,&nbsp;Xiaodong Zhou","doi":"10.1007/s13726-024-01309-6","DOIUrl":"10.1007/s13726-024-01309-6","url":null,"abstract":"<div><p>Carbon fibers (CFs) can usually only be used to reinforce polar (or non-polar) resins, and if they are to be used for reinforcing with another polymer type, they need to be surface-modified, which will inevitably damage the surface of the carbon fibers and thus reduces the overall performance of the composite. In this work, graphene oxide was first prepared and modified, and then two polymer brushes, polystyrene (PS) and hydroxypropyl polyacrylate (PHPA) were grafted onto its surface in a one-step process. This approach reduced the damage caused to the CFs surface by multiple treatments and improved the interfacial adhesion between CFs and different resin matrices. An electrophoretic deposition method was used to deposit the modified GO on the surface of CFs, which can form strong interaction between CFs and a variety of resins. The results showed that different molecular chains have been grafted on the surface of GO, and then the latter was uniformly deposited on the surface of CFs, improving their surface toughness. Additionally, when the suspension concentration was only 1 mg/mL, the interfacial shear strength (IFSS) of CF/epoxy and CF/PP increased by 52.0% and 26.5%, respectively. This means that a small amount of GO can significantly improve the interfacial properties of carbon fiber reinforced composites (CFRCs). Therefore, they can be applied to aerospace, wind energy and other industries to effectively improve the interfacial bonding between fiber and resin, after surface modification.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 8","pages":"1143 - 1156"},"PeriodicalIF":2.4,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884574","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":"Innovative lightweight concrete: effect of fiber, bacteria and nanomaterials","authors":"Hatice Elif Beytekin,&nbsp;Öznur Biricik Altun,&nbsp;Ali Mardani,&nbsp;Filiz Şenkal Sezer","doi":"10.1007/s13726-024-01313-w","DOIUrl":"10.1007/s13726-024-01313-w","url":null,"abstract":"<div><p>It was reported that various studies have been carried out to increase the strength, permeability and durability performances of lightweight concrete (LC) mixtures. Extensive research was carried out on the production of sustainable and ecologic LC. In this context, the use of various innovative materials and methods have been demonstrated. In this direction, increasing the service life of concrete produced by the use of fiber, nanomaterials and self-healing with bacteria is one of the applied methods. In this study, the effects of the use of fiber, nanomaterials and bacteria on the workability, unit weight, strength, toughness, modulus of elasticity, impact resistance, permeability, drying-shrinkage, freeze–thaw, high temperature resistance, thermal conductivity performance of LC mixtures have been compared in detail. It was reported that workability, specific gravity, permeability, thermal conductivity and drying-shrinkage values decrease, while strength, high temperature resistance, freeze–thaw resistance and toughness performance increase with the addition of fiber and nanomaterials to LC mixtures. While it was emphasized that the strength and permeability performance and elasticity modulus values of the mixtures increased with the addition of bacteria. In addition, the use of fiber has insignificant effect in terms of the modulus of elasticity.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 9","pages":"1327 - 1350"},"PeriodicalIF":2.4,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13726-024-01313-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140610091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Grafted barley husk/poly (vinyl alcohol)/starch composite films: effect of fatty acid chain length and grafted barley husk loading","authors":"Aanchal Mittal,&nbsp;Sangeeta Garg,&nbsp;Shailendra Bajpai","doi":"10.1007/s13726-024-01311-y","DOIUrl":"10.1007/s13726-024-01311-y","url":null,"abstract":"<div><p>The effect of incorporation of barley husk (BH) grafted with different fatty acids (lauric acid: LBH; palmitic acid: PBH; arachidic acid: ABH) on the physicochemical properties of cross-linked PVA/starch based composite films was studied at different loadings (0.2–2)%. Surface morphology of the films showed that grafted BH dispersed well within the matrix as compared to BH enabling them to provide the greatest reinforcing effect. Composite films containing grafted BH showed higher tensile strength, water resistant properties, thermal stability as well as barrier properties compared to composite films containing BH. At optimum loading (1%), tensile strength of the composite film, containing ABH, was 22.9 MPa, and 23.5% and 31.6% higher than films containing LBH (17.4 MPa) and PBH (18.54 MPa), respectively. Composite films prepared with ABH exhibited the highest values of water contact angle, water vapor, and oxygen permeability among all composite films owing to the incorporation of longest hydrophobic aliphatic chain and provides more hindrance for transmission. The activation energy values of thermal degradation for composite film directly indicate their thermal stability were calculated as 203.37, 222.62 and 366.52 kJ at 1% loading of LBH, PBH, and ABH, respectively. Thus, composite film containing ABH at 1% showed maximum improvement in physicochemical properties followed by composite films containing 1% PBH and LBH. This study provides the alternatives for choosing the most effective composite film, which can be a nature-friendly substitute for non-degradable packaging films and it may help to maintain the circular economy.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 8","pages":"1171 - 1187"},"PeriodicalIF":2.4,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140592840","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":"Structural modification and encapsulation process of palygorskite for development of flame retardant additives: study of their thermal and mechanical properties in PLA/EVA blends","authors":"Saul Sánchez-Valdes,&nbsp;Gerardo Pozos-Sanchez,&nbsp;Jose Alberto Rodríguez-Gonzalez,&nbsp;Jorge Enrique Rivera-Salinas,&nbsp;Jorge Alonso Uribe-Calderon,&nbsp;Mario Valera-Zaragoza,&nbsp;Gabriela Yolatzin. Romero-Zúñiga,&nbsp;Ernesto Hernandez-Hernandez,&nbsp;Eedgar Cabrera-ALvarez,&nbsp;L. Da Silva","doi":"10.1007/s13726-024-01318-5","DOIUrl":"10.1007/s13726-024-01318-5","url":null,"abstract":"<div><p>In this work, we described the structural modification of palygorskite (Pal) and its use in the preparation of flame retardant (FR) additives. Theses FR additives were prepared by an encapsulation process involving in situ polymerization reaction between melamine and diisocyanate. The structural modification of Pal and the encapsulation process were characterized by FTIR and SEM techniques. These FR additives were incorporated into polymer blends of poly(lactic acid) (PLA) and ethylene vinyl acetate (EVA) by melt mixing. The compounds obtained from mixing FR additives and PLA/EVA were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), cone calorimetry, limiting oxygen index (LOI), and plastics flammability standard (UL 94, HB). The incorporation of FR additives showed a significant change in the thermal properties of the PLA/EVA composites. We observed a marked reduction in the peak heat release rate during cone calorimetry tests and significant increase of LOI value. A reduction in the horizontal burn (HB) rate was also observed in the UL-94 test. The results obtained confirmed the notable increase in thermal stability and FR characteristics of the PLA/EVA composite, which was attributed to the formation of a homogeneous protective carbon layer on the surface of the composite samples. This composite showed excellent FR characteristics with good mechanical properties, which is a good option to obtain flame retardant composites with better performance. These results demonstrated that this methodology is a promising way to meet the growing demand for high-performance materials with flame retardant characteristics, using composites with sustainable and ecological materials.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"33 9","pages":"1189 - 1201"},"PeriodicalIF":2.4,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140592839","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}