Polymer International最新文献_第8页

Improved thermal stability and flame-retardant performance of rigid polyurethane foam modified by hydrolyzed keratin-modified polyol and aluminium hypophosphite 用水解角蛋白改性多元醇和次磷酸铝改性的硬质聚氨酯泡沫的热稳定性和阻燃性能得到改善

IF 3.2 4区化学

Polymer International Pub Date : 2024-01-31 DOI: 10.1002/pi.6616

Xu Zhang, Jianwei Wang, Simiao Sun, Chen Xu, Zhi Wang, Hua Xie

{"title":"Improved thermal stability and flame-retardant performance of rigid polyurethane foam modified by hydrolyzed keratin-modified polyol and aluminium hypophosphite","authors":"Xu Zhang, Jianwei Wang, Simiao Sun, Chen Xu, Zhi Wang, Hua Xie","doi":"10.1002/pi.6616","DOIUrl":"10.1002/pi.6616","url":null,"abstract":"Rigid polyurethane foam (RPUF) was prepared using hydrolyzed keratin-modified polyol and aluminium hypophosphite as flame retardants. The effects of aluminium hypophosphite on the thermal stability and flame-retardant properties of hydrolyzed keratin-modified RPUFs were studied by limiting oxygen index (LOI) method, thermogravimetric analysis, pyrolysis kinetic analysis, cone analysis and smoke density analysis. The results showed that RPUF added with 7.5 wt% aluminium hypophosphite (RPUF-HK5-7.5AL) had the highest LOI, which was 26.1%. RPUF-HK5-7.5AL had the highest initial decomposition temperature, the highest T5% at a heating rate of 10 °C min−1 and the highest activation energy. In addition, RPUF-HK5-7.5AL possessed the lowest heat release rate at 50 kW m−2 of 125.10 kW m−2, and the lowest total heat release rate of 5.30 MJ m−2. Results indicated that RPUF-HK5-7.5AL had the best thermal stability and flame-retardant properties. Scanning electron microscopy showed that hydrolyzed keratin and aluminium hypophosphite had a synergistic effect on the flame retardancy of the RPUFs. The current research results provide a useful reference for the preparation of RPUFs with good flame-retardant properties by bio-based modification. © 2024 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":"73 5","pages":"393-409"},"PeriodicalIF":3.2,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139656528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comprehensive performance of polycarbonate films doped with Tb(III) and Eu(III) complexes 掺杂铽（III）和铕（III）络合物的 PC 薄膜的综合性能

IF 3.2 4区化学

Polymer International Pub Date : 2024-01-30 DOI: 10.1002/pi.6614

Fang Wu, Xinfei Zhang, Qi Wang, Dayang Yu, Pan Zheng, Rongli Zhu, Xu Wang, Zejun Pu, Jiachun Zhong

引用次数: 0

THE INFLUENCE OF COMPRESSION MOLDING DURATION ON THE PROPERTIES OF COMPOSITE BRAKE SHOES FOR RAILWAY APPLICATION 压缩成型持续时间对铁路用复合制动蹄性能的影响

IF 3.2 4区化学

Polymer International Pub Date : 2024-01-29 DOI: 10.1002/pi.6615

Janviter Manalu, Johni Jonatan Numberi, Apolo Safanpo, Muhammad Fikri Hibatullah, Deni Fajar Fitriyana, Januar Parlaungan Siregar, Tezara Cionita, Jamiluddin Jaafar, Ahmad Yunus Nasution, Al Ichlas Imran

{"title":"THE INFLUENCE OF COMPRESSION MOLDING DURATION ON THE PROPERTIES OF COMPOSITE BRAKE SHOES FOR RAILWAY APPLICATION","authors":"Janviter Manalu, Johni Jonatan Numberi, Apolo Safanpo, Muhammad Fikri Hibatullah, Deni Fajar Fitriyana, Januar Parlaungan Siregar, Tezara Cionita, Jamiluddin Jaafar, Ahmad Yunus Nasution, Al Ichlas Imran","doi":"10.1002/pi.6615","DOIUrl":"https://doi.org/10.1002/pi.6615","url":null,"abstract":"Railway brake shoes from composite materials are currently being developed and researched. Previous investigations have demonstrated the successful fabrication of brake shoes utilizing the hand lay-up method. However, it was observed that the resulting density did not meet the specified range of 1.7 to 2.4 g/cm3 defined by INKA (Indonesian Railway Company) Ltd. The purpose of this study was to examine the effect of compression molding duration on the characteristics of composite brake shoe. The composite manufacturing process was carried out using the compression cold molding method with a variation of pressing time for 20 minutes, 25 minutes, and 30 minutes and a pressing load of 20 MPa. The findings indicated that prolonging the duration of compression molding led to enhanced mechanical and physical properties of the brake shoe specimens. Utilizing a compression molding duration of 30 minutes provided the best possible outcomes in terms of density, hardness, flexural strength, thermal resistance, and coefficient of friction, which are 1.89 g/cm3, 80.20 Shore D Hardness, 34.15 MPa , 503.67o C, and 0.38, respectively. The research findings demonstrate that the composite brake shoes manufactured have effectively fulfilled the physical, mechanical, and thermal criteria established by INKA Ltd. Unfortunately, the railway brake shoe sample failed to meet the specified coefficient of friction requirements as the resulting coefficient of friction exceeded 0.27.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":"157 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139582226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of aramid fibers modified by glycidyl polyhedral silsesquioxane assisted with supercritical carbon dioxide on the properties of aramid fiber-reinforced styrene butadiene rubber composites 超临界二氧化碳辅助缩水甘油聚硅氧烷改性芳纶纤维对芳纶纤维增强丁苯橡胶复合材料性能的影响

IF 3.2 4区化学

Polymer International Pub Date : 2024-01-29 DOI: 10.1002/pi.6613

Yang Li, Caiwen Shi, Xiaoli Pan, Le Yang, Chun Zhang

{"title":"Influence of aramid fibers modified by glycidyl polyhedral silsesquioxane assisted with supercritical carbon dioxide on the properties of aramid fiber-reinforced styrene butadiene rubber composites","authors":"Yang Li, Caiwen Shi, Xiaoli Pan, Le Yang, Chun Zhang","doi":"10.1002/pi.6613","DOIUrl":"10.1002/pi.6613","url":null,"abstract":"The weak interfacial adhesion of aramid fibers (AFs) in rubber composites can be improved by modifying their surface structure. Herein, modified AFs with a high grafting rate were prepared by modification using glycidyl polyhedral silsesquioxane (POSS) assisted with supercritical carbon dioxide (scCO2). X-ray photoelectron spectroscopy confirmed the chemical bonding between AFs and glycidyl POSS. Thermogravimetric analysis and scanning electron microscopy images showed that POSS was grafted uniformly and the surface roughness enhanced obviously. After grafting the rubber with 5 wt% glycidyl POSS assisted with scCO2, the surface grafting rate reached 12.26% and surface crystal spacing increased. The grafted layer on the modified AF surface was uniform, and the tensile strength of the modified fiber increased by 7.98%. Short AF-reinforced carbon black/styrene butadiene rubber (AF/CB/SBR = 2/50/100 phr) composites were prepared to investigate the adhesion strength between modified AFs and SBR. The reduction in tan δ of the composites confirmed the improvement in the interfacial adhesion strength. The tensile strength and modulus at 100% elongation of the composites increased by 15.13% and 25.77%, respectively, and the relative interface slip increased by 23.26%. Moreover, the cutting resistance of the composites showed a dramatic improvement, particularly for grafting with 5% glycidyl POSS assisted with scCO2. © 2024 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":"73 6","pages":"454-463"},"PeriodicalIF":3.2,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140488636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shape memory polylactic acid/modified Eucommia ulmoides gum thermoplastic vulcanizates based on excellent interfacial adhesion and co-continuous structure 基于优异界面粘合力和共连续结构的形状记忆聚乳酸/改性杜仲胶热塑性硫化弹性体

IF 3.2 4区化学

Polymer International Pub Date : 2024-01-23 DOI: 10.1002/pi.6612

Yan Wang, Xianqiang Pei, Qianyao Pei, Zhancheng Zhang, Yaoming Zhang, Qihua Wang, Tingmei Wang

{"title":"Shape memory polylactic acid/modified Eucommia ulmoides gum thermoplastic vulcanizates based on excellent interfacial adhesion and co-continuous structure","authors":"Yan Wang, Xianqiang Pei, Qianyao Pei, Zhancheng Zhang, Yaoming Zhang, Qihua Wang, Tingmei Wang","doi":"10.1002/pi.6612","DOIUrl":"10.1002/pi.6612","url":null,"abstract":"Towards the goal of developing renewable, biocompatible and intelligent polymer materials, natural Eucommia ulmoides gum (EUG) was modified via epoxidation and then the epoxidized EUG (EEUG) was compounded with another sustainable and biobased polymer, polylactic acid (PLA), to develop shape memory thermoplastic vulcanizates (TPVs) through reactive blending. The prepared PLA/EEUG TPVs displayed not only enhanced toughness but also greatly improved shape recovery ability, which was generated from the co-continuous phase structure and excellent interfacial adhesion induced by in situ compatibilization during reactive blending. It is shown that dicumyl peroxide content exerted little influence on the toughness of the TPVs. However, heat-triggered shape memory effects of the TPVs were significantly affected by the dicumyl peroxide content with a decrease in deformation ratio (Δε) from 163.51% to 128.36% and an increase in shape recovery ratio (Rr) from 73.32% to 91.93%. The findings of the present study offer an idea for the industrialization of biocompatible and smart materials for biomedical applications. © 2024 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":"73 6","pages":"435-445"},"PeriodicalIF":3.2,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139561265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ductile poly[(3-hydroxybutyrate)-co-(4-hydroxybutyrate)]-based blends derived from biomass 基于生物质的延展性聚[(3-羟基丁酸)-共(4-羟基丁酸)]混合物

IF 3.2 4区化学

Polymer International Pub Date : 2024-01-17 DOI: 10.1002/pi.6610

Guoqiang Wang, Xiang Chi

引用次数: 0

Simply stated, the world must consume less plastic! 简而言之，世界必须减少塑料消费！

IF 3.2 4区化学

Polymer International Pub Date : 2024-01-05 DOI: 10.1002/pi.6602

Timothy E. Long

引用次数: 0

Evaluation of ferroelectric profile of poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) thin films by positive-up–negative-down and fatigue measurement 通过正-上-负-下和疲劳测量评估 PVDF-TrFE 薄膜的铁电曲线

IF 3.2 4区化学

Polymer International Pub Date : 2023-12-22 DOI: 10.1002/pi.6609

G Hassnain Jaffari, Musfira Aqeel

{"title":"Evaluation of ferroelectric profile of poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) thin films by positive-up–negative-down and fatigue measurement","authors":"G Hassnain Jaffari, Musfira Aqeel","doi":"10.1002/pi.6609","DOIUrl":"10.1002/pi.6609","url":null,"abstract":"Organic polymers are of interest due to their numerous promising potential applications in the area of energy harvesting and sensing. In this context, piezoelectric and ferroelectric polymers are subject to intense research; however, it is challenging to understand polarization switching in such systems. The focus of the present study is to thoroughly evaluate the finer details of polarization reversal in poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) thin films. The intrinsic features arising from the true values of (switching) polarization and extrinsic features associated with the presence of non-switching contributions, i.e. leakage current and linear dielectric component, have been investigated using the positive-up–negative-down technique. These contributions are quantified and discussed. Furthermore, fatigue endurance has been examined by repeated switching cycles. Increase in polarization increases is associated with the improved crystallinity and enhancement of the β-phase. However, a higher degree of crystallinity, for extended numbers of repeated cycles of the bipolar electric field, resulted in degradation of the (switching) polarization. Fatigue significantly affects the leakage and ferroelectric components while the paraelectric contribution remains almost constant. The underlying mechanism of such trends are discussed in terms of hysteresis losses. © 2023 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":"73 4","pages":"261-269"},"PeriodicalIF":3.2,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138946631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of fibre loading on the density, voids, dimensional resilience, tensile characteristics and thermomechanical behaviour of bamboo fibre and bio-epoxy composites 纤维负载对竹纤维和生物环氧复合材料的密度、空隙、尺寸回弹性、拉伸特性和热机械行为的影响

IF 3.2 4区化学

Polymer International Pub Date : 2023-12-22 DOI: 10.1002/pi.6608

M. Chandrasekar, K. Senthilkumar, Hassan Fouad, Mohammad Jawaid, Mohamed Hashem, Ahmad Safwan Ismail, Naheed Saba, Ramzi Khiari

{"title":"Influence of fibre loading on the density, voids, dimensional resilience, tensile characteristics and thermomechanical behaviour of bamboo fibre and bio-epoxy composites","authors":"M. Chandrasekar, K. Senthilkumar, Hassan Fouad, Mohammad Jawaid, Mohamed Hashem, Ahmad Safwan Ismail, Naheed Saba, Ramzi Khiari","doi":"10.1002/pi.6608","DOIUrl":"10.1002/pi.6608","url":null,"abstract":"This paper investigates the influence of bamboo fibre loadings (30, 40, 50 and 60 wt%) on the physical, tensile and dimensional behaviour of short-bamboo-fibre-reinforced bio-epoxy matrix composites. Water absorption, thickness swelling, density, void content, tensile and thermomechanical analysis were determined. The findings indicated that higher fibre loading led to elevated water absorption and increased thickness swelling in bamboo fibre composites. The order of thickness swelling and water absorption behaviour was bio-epoxy < B-30 < B-40 < B-50 < B-60. Similarly, the measured density of composites increased with respect to fibre loading. However, the void content decreased when the fibre loading was >40 wt%. Concerning tensile characteristics, it was observed that all composite materials displayed lower tensile strength compared to the bio-epoxy matrix. However, there was a notable enhancement in the elasticity of the composites. As an example, B-60 exhibited the highest Young's modulus at 7.33 GPa. The analysis of the fracture behaviour of tension-tested samples was conducted using images obtained from SEM. The coefficient of thermal expansion was increased drastically as fibre loading increased. This indicated that the dimensional change was higher. Thus, it is desirable to have lower fibre loading to obtain better dimensional stability under the influence of temperature. © 2023 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":"73 5","pages":"378-384"},"PeriodicalIF":3.2,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138946642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Poly(vinylidene fluoride) ultrafiltration membranes tailored with zirconium-based MOF-801 for water treatment applications 使用锆基 MOF-801 定制的聚偏氟乙烯超滤膜用于水处理应用

IF 3.2 4区化学

Polymer International Pub Date : 2023-12-18 DOI: 10.1002/pi.6607

Laila Rameesha, Dipak Rana, Alagumalai Nagendran

{"title":"Poly(vinylidene fluoride) ultrafiltration membranes tailored with zirconium-based MOF-801 for water treatment applications","authors":"Laila Rameesha, Dipak Rana, Alagumalai Nagendran","doi":"10.1002/pi.6607","DOIUrl":"10.1002/pi.6607","url":null,"abstract":"Highly hydrophilic and antifouling poly(vinylidene fluoride) (PVDF) ultrafiltration membranes are developed with excellent permeation using a zirconium-based metal–organic framework (MOF-801). MOF-801 is synthesized by a solvothermal method using zirconium(IV) oxychloride octahydrate (ZrOCl2⋅8H2O) and fumaric acid. The chemical functionality of MOF-801 is studied by Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) whereas surface morphology and elemental composition are probed by scanning electron microscopy (SEM)/energy-dispersive X-ray analysis (EDX). The PVDF/MOF-801 membranes are characterized in terms of FTIR, XRD, FESEM/EDX and atomic force microscopy. The performance of the hybrid PVDF/MOF-801 membranes in terms of pure water flux and antifouling ability is found to be improved compared with bare PVDF membranes. The wettability of the membranes is measured by water contact angle and found to be 76.7° for bare PVDF membrane, which decreases upon the addition of MOF-801 to 55.1° due to the increase in surface hydrophilicity. A notable increase in roughness of 226.29 nm and a porosity of 67.91% is observed for the addition of 2 wt% MOF-801 in PVDF membrane matrix. The flux recovery ratio of the hybrid membrane is increased from 66.4% to 89.6% and from 68.3% to 85.2% for bovine serum albumin (BSA) and humic acid (HA) separation, respectively. In addition, the reversible and irreversible fouling performance during the rejection of BSA (93%) and HA (88%) indicates the enhanced antifouling property of the PVDF/MOF-801 membranes. A zone of inhibition test evidences the outstanding antibiofouling activity of the PVDF/MOF-801 membranes against E. coli and S. aureus. Overall results demonstrated the suitability of hybrid PVDF/MOF-801 membranes for water and wastewater treatment. © 2023 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":"73 5","pages":"368-377"},"PeriodicalIF":3.2,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138824837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0