Polymer International最新文献_第7页

Reactive melt-grafting of maleic anhydride onto olefin block copolymer toward high-performance polar polyolefin thermoplastic elastomer 将马来酸酐反应性熔融接枝到烯烃嵌段共聚物 (OBC) 上，形成高性能极性聚烯烃热塑性弹性体

IF 3.2 4区化学

Polymer International Pub Date : 2024-03-05 DOI: 10.1002/pi.6627

Yu Kou, Yuqi Ma, Jialiang Li, Shilong Zhang, Jiaxun Cao, Hua Deng, Yanling Zhu, Yongsheng Zhao, Jianbin Qin, Guangcheng Zhang

{"title":"Reactive melt-grafting of maleic anhydride onto olefin block copolymer toward high-performance polar polyolefin thermoplastic elastomer","authors":"Yu Kou, Yuqi Ma, Jialiang Li, Shilong Zhang, Jiaxun Cao, Hua Deng, Yanling Zhu, Yongsheng Zhao, Jianbin Qin, Guangcheng Zhang","doi":"10.1002/pi.6627","DOIUrl":"10.1002/pi.6627","url":null,"abstract":"The block structure of olefin block copolymer (OBC) elastomer gives it good elasticity and heat resistance relative to other polyolefin elastomers. However, the non-polar nature of OBC chains limits its comprehensive properties like dyeing and toughening for polar engineering plastics. In this work, maleic anhydride (MA) and dicumyl peroxide (DCP) were selected as a typical polar monomer and a radical initiator to modify the polarity of OBC elastomer. During the melt-grafting process, the DCP content was tuned to optimize the grafting efficiency while the MA-to-OBC ratio was fixed at 5 wt%. It was found that all the melt-grafting reactions show high efficiency and can be finished in 3 min at 170 °C. With the increase of DCP content, the estimated grafting degree of OBC-g-MA elastomer increases from 0.40% to 1.16% along with increased gel content from 4.27% to 22.44%. A suitable grafting process was obtained with a DCP content of 3.0 wt% by balancing grafting efficiency and final mechanical properties. The optimized OBC-g-MA elastomer with a grafting degree of 0.92% has a mechanical strength of 17.15 MPa, a Young's modulus of 26.35 MPa, elongation of 1564% and strain recovery of 59.73%. Additionally, the contact angle test shows that polar grafting can increase surface hydrophilicity while excessive crosslinking promotes hydrophobicity. Therefore, our work has demonstrated the feasibility of the reactive melt-grafting method to prepare OBC-g-MA elastomer and can also provide a processing reference for other chemical functionalization of polyolefin thermoplastic elastomers. © 2024 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140045452","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

Overview of the challenges and current solutions in organic and hybrid coatings for historical monuments and architecture 历史古迹和建筑涂料面临的挑战和现有解决方案概览

IF 2.9 4区化学

Polymer International Pub Date : 2024-02-28 DOI: 10.1002/pi.6626

Cory B Sims, Joseph C Furgal

引用次数: 0

Designing magnetic catalysts based on gold nanoparticles supported by ethylenediamine tetraacetic acid functionalized amino-modified poly(N-isopropyl acrylamide) for reduction of nitro compounds in water 设计基于 EDTA 功能化氨基改性 PNIPAM 支持的金纳米粒子的磁性催化剂，用于还原水中的硝基化合物

IF 3.2 4区化学

Polymer International Pub Date : 2024-02-28 DOI: 10.1002/pi.6625

Hadieh Rahbar Kafshboran, Soheila Ghasemi

{"title":"Designing magnetic catalysts based on gold nanoparticles supported by ethylenediamine tetraacetic acid functionalized amino-modified poly(N-isopropyl acrylamide) for reduction of nitro compounds in water","authors":"Hadieh Rahbar Kafshboran, Soheila Ghasemi","doi":"10.1002/pi.6625","DOIUrl":"10.1002/pi.6625","url":null,"abstract":"A novel smart catalyst was developed with amino-modified thermo-responsive poly(N-isopropyl acrylamide) (PNIPAM) grafts on silica-coated magnetic nanoparticles using the conventional free radical polymerization process. By this methodology, the polymer was successfully grafted mainly onto silica-modified iron oxide nanoparticles (Fe3O4@Si). The PNIPAM-grafted Fe3O4@Si was then subjected to ethylenediamine treatment to produce the amino-functionalized support (Fe3O4@Si@PNIPAM-NH2), which was subsequently modified with carboxyl functional groups by using EDTA (ethylenediaminetetraacetic acid) to create Fe3O4@Si@PNIPAM-NH2-EDTA. Au nanoparticles were then decorated on this support through its two amines and four carboxylates. Different methods were used to study this novel catalyst, including inductively coupled plasma, Fourier transport infrared spectroscopy, TGA, dynamic light scattering, SEM, energy-dispersive X-ray analysis, vibrating sample magnetometry, XRD and elemental CHN analysis. The reduction of several aryl-nitro derivatives demonstrated a significant catalytic activity for the as-synthesized gold catalyst (Fe3O4@Si@PNIPAM-NH2-EDTA-Au). The Au catalyst can be successfully removed from the reaction components using a magnetic field and used again in eight successive reduction reactions without significant gold leaching and loss of catalytic activity. © 2024 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004529","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}

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Development of a high-pressure infiltration process for phenol–formaldehyde matrix composites 开发苯酚-甲醛基复合材料的高压渗透工艺

IF 3.2 4区化学

Polymer International Pub Date : 2024-02-26 DOI: 10.1002/pi.6623

Samuel Weiler, Patrick Schwartzkopf, Henry Haffner, K Chandrashekhara

{"title":"Development of a high-pressure infiltration process for phenol–formaldehyde matrix composites","authors":"Samuel Weiler, Patrick Schwartzkopf, Henry Haffner, K Chandrashekhara","doi":"10.1002/pi.6623","DOIUrl":"10.1002/pi.6623","url":null,"abstract":"Phenol–formaldehyde (phenolic) thermosets are known for excellent heat and chemical resistance, high flame retardance, and good mechanical performance. However, phenolics are also known for their high brittleness, and tendency to form voids, due to a condensation reaction forming water during curing. These voids can decrease the mechanical performance of the resultant phenolic composite and introduce undesirable performance characteristics. This work aims to develop a technique that uses high-pressure infiltration to obtain dense phenolic matrix composites, with commercially available resin and fiber reinforcement. The high-pressure system developed in this work is compared to a conventional low-pressure resin infusion technique, and the porosity after each infusion is analyzed. A model of the low- and high-pressure systems was developed, and the predicted time of infiltration was compared to the experimental results. The high-pressure system had 97% less open porosity after infusion than the low-pressure technique, suggesting that it can produce a higher-quality and better-performing phenolic composite than conventional techniques. Also, the mechanical test performed indicates improved performance for the high-pressure injection with a 30.73% increase in ultimate tensile strength in comparison to low pressure, indicating better mechanical performance. © 2024 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139978944","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

An investigation of the microstructure and tribological behavior of polyether ether ketone composites fabricated by extrusion-based additive manufacturing 基于挤压的添加制造法制造的聚醚醚酮复合材料的微观结构和摩擦学行为研究

IF 3.2 4区化学

Polymer International Pub Date : 2024-02-26 DOI: 10.1002/pi.6624

Xiancheng Lv, Shuyan Yang, Xianqiang Pei, Yaoming Zhang, Qihua Wang, Tingmei Wang

{"title":"An investigation of the microstructure and tribological behavior of polyether ether ketone composites fabricated by extrusion-based additive manufacturing","authors":"Xiancheng Lv, Shuyan Yang, Xianqiang Pei, Yaoming Zhang, Qihua Wang, Tingmei Wang","doi":"10.1002/pi.6624","DOIUrl":"10.1002/pi.6624","url":null,"abstract":"Carbon fiber reinforced polyether ether ketone (CF/PEEK) composites are widely used as tribo-materials in the aerospace and automotive industry. To amplify the industrial utilization of extrusion-based additive manufacturing fused deposition modeling in fabricating CF/PEEK tribo-composites, the composites' microstructure–property relationship was studied with respect to carbon fiber content varying between 5 wt% and 30 wt%. This revealed that the incorporation of carbon fibers helped enhance the mechanical strength of PEEK greatly with an optimal content of 5 wt%, at which the composite material exhibited the highest crystallinity as well as the best mechanical performance. Tribological tests indicated that CF/PEEK composites were more suitable for high speed and heavy load conditions especially for 20 wt% CF/PEEK, which was associated with the establishment of high quality transfer films covered on counter steel surfaces. The present work provides a simple and low cost way of fabricating high performance PEEK composites used as tribo-materials. © 2024 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139978805","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

The effect of hybrid thermal fillers on thermal conductivity of carbon fiber reinforced polybutylene terephthalate composites 混合热填料对碳纤维增强聚对苯二甲酸丁二醇酯复合材料导热性的影响

IF 3.2 4区化学

Polymer International Pub Date : 2024-02-20 DOI: 10.1002/pi.6622

Zafer Yenier, Yoldas Seki, Sibel Aker, Ferhat Öner, Lutfiye Altay, Mehmet Sarikanat

{"title":"The effect of hybrid thermal fillers on thermal conductivity of carbon fiber reinforced polybutylene terephthalate composites","authors":"Zafer Yenier, Yoldas Seki, Sibel Aker, Ferhat Öner, Lutfiye Altay, Mehmet Sarikanat","doi":"10.1002/pi.6622","DOIUrl":"10.1002/pi.6622","url":null,"abstract":"The use of functional polymeric composites with superior thermal properties, capable of replacing conventional polymers, has increased in recent years, particularly in the electrical-electronics sector where thermal management is crucial. Carbon fiber (CF) polymer–matrix structural composites have relatively high in-plane thermal conductivity but low through-plane conductivity. In order to further enhance the through-plane and in-plane conductivity of CF-reinforced polybutylene terephthalate (PBT) composite, a hybrid loading approach was employed, incorporating synthetic graphite (SG), boron nitride (hBN), aluminium nitride (AlN) and graphene (G) in composite formulations. It was found that the in-plane conductivity of PBT-20CF-20SG-3G and the through-plane conductivity of PBT-20CF-20SG-3AlN are 69% and 25% higher, respectively, than those of PBT-40CF. However, the mechanical properties of hybrid composites exhibit lower values compared to those of CF-reinforced PBT composites. The tensile strength value of PBT-40CF is about 33% and 57% higher than those of PBT-20CF-20SG-3G and PBT-20CF-20SG-3AlN. Moreover, the flexural strength of PBT-40CF is about 48% and 38% higher than those of PBT-20CF-20SG-3G and PBT-20CF-20SG-3AlN, respectively. The density value of PBT-40CF is lower than that of the composites of PBT-20CF-20SG. From TGA it was observed that the thermal stability of PBT-40CF is comparable to that of the composites PBT-20CF-20SG. From the conducted study, it can be proposed that the hybrid combination of SG, hBN, AlN and G can be utilized to achieve higher thermal conductivity values, instead of relying solely on CF in the composites. © 2024 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/pi.6622","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139923381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and properties of PC/PCTG blends with excellent optical properties and solvent resistance 具有优异光学性能和耐溶剂性的 PC/PCTG 混合物的制备与性能

IF 3.2 4区化学

Polymer International Pub Date : 2024-02-20 DOI: 10.1002/pi.6620

DaYang Yu, Jiachun Zhong, Fang Wu, Pan Zheng, Yu Xiang, Rongli Zhu, Xu Wang, Mengjie Yue, Zejun Pu

{"title":"Preparation and properties of PC/PCTG blends with excellent optical properties and solvent resistance","authors":"DaYang Yu, Jiachun Zhong, Fang Wu, Pan Zheng, Yu Xiang, Rongli Zhu, Xu Wang, Mengjie Yue, Zejun Pu","doi":"10.1002/pi.6620","DOIUrl":"10.1002/pi.6620","url":null,"abstract":"Blends of polycarbonate (PC) and poly(1,4-cyclohexylene dimethylene terephthalate glycol) (PCTG) were synthesized using a twin-screw extruder. Four distinct PC/PCTG blends were produced with PCTG constituting 10%, 20%, 30%, and 40% of the total weight. Comprehensive evaluations were performed to investigate their thermal properties, solvent resistance, light transmittance, mechanical characteristics, and melt flow index. Differential scanning calorimetry and thermogravimetric analysis demonstrated a single glass transition temperature in the PC/PCTG blends, indicating high compatibility. The incorporation of PCTG was observed to affect the blends' thermal stability. The data revealed a progressive increase in solvent resistance, light transmittance, and melt flow index with increasing PCTG content. The light transmittance of the blend reached 87.5%, and the melt flow index was recorded at 124.2 g (10 min)−1. Mechanical tests showed that the tensile and bending strengths were relatively stable with the addition of PCTG, but there was a noticeable reduction in notched impact strength as the proportion of PCTG increased. © 2024 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139923009","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}

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Chlorinated plastics offer unique opportunities and challenges in upcycling 氯化塑料为升级再造提供了独特的机遇和挑战

IF 3.2 4区化学

Polymer International Pub Date : 2024-02-19 DOI: 10.1002/pi.6621

Ali Al Alshaikh, Jason E. Bara

引用次数: 0

Achieving performance-advantaged polydicyclopentadiene via sequential ring-opening metathesis polymerization and radical reaction 通过顺序 ROMP 和自由基反应实现性能优越的聚双环戊二烯

IF 3.2 4区化学

Polymer International Pub Date : 2024-02-16 DOI: 10.1002/pi.6619

Qingyan Zhan, Fei Huangfu, Po Yang

引用次数: 0

Reduction of mesoporous poly(ether ether ketone) materials, preserving pore size 还原介孔聚醚醚酮材料，保持孔径大小

IF 3.2 4区化学

Polymer International Pub Date : 2024-02-09 DOI: 10.1002/pi.6618

Sagiv Weintraub, Gary Gellerman, Andrii Bazylevich, Ben Bikson

{"title":"Reduction of mesoporous poly(ether ether ketone) materials, preserving pore size","authors":"Sagiv Weintraub, Gary Gellerman, Andrii Bazylevich, Ben Bikson","doi":"10.1002/pi.6618","DOIUrl":"10.1002/pi.6618","url":null,"abstract":"Poly(ether ether ketone) (PEEK) is an important high-performance engineering polymer that is used extensively in numerous engineering applications that require chemical, solvent and thermal resistance. These attributes make PEEK attractive for the preparation of porous materials and membranes. Chemical modifications of preformed porous PEEK materials can expand the utilization of PEEK in a range of applications. It is desirable to carry out chemical functionalization without affecting the preformed porous structure or the degree of polymer crystallinity responsible for the sought-after properties. We report here on the heterogeneous functionalization of preformed mesoporous PEEK materials with hydroxyl groups using sodium borohydride as a reducing agent in a poly(ethylene glycol)/tetrahydrofuran solvent mixture. The pore structure of functionalized materials was characterized, and the degree of modification with functional groups was measured as a function of reaction protocol. The methodology was applied to the preparation of porous PEEK materials in the form of beads and hollow fibers that differed in semicrystalline morphology and pore structure. The degree of surface modification by –OH groups in reduced PEEK (PEEK-OH) porous materials was determined quantitatively by measuring the carbocation adduct concentration formed upon the dissolution of PEEK-OH in sulfuric acid using UV–visible spectroscopy. Bis(4-(4-methoxyphenoxy)phenyl)methanone was used to optimize the reaction condition protocol. The degree of crystallinity and pore structure of the functionalized articles were largely preserved following modification. © 2024 Society of Industrial Chemistry.","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139770695","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