SPE polymers最新文献

筛选

英文中文

Effects of L‐ and D‐ form oligo(lactic acid)s grafted cellulose reinforcement on the thermal properties of poly(L‐lactic acid) composites L -和D -型低聚乳酸接枝纤维素增强对聚L -乳酸复合材料热性能的影响

SPE polymers Pub Date : 2023-09-18 DOI: 10.1002/pls2.10101

Md. Masud Rana, Md. Hafezur Rahaman, G. M. Arifuzzaman Khan, Md. Saddam Hossain, Md. Masud Parvez

{"title":"Effects of <scp>L</scp>‐ and <scp>D‐</scp> form oligo(lactic acid)s grafted cellulose reinforcement on the thermal properties of poly(<scp>L</scp>‐lactic acid) composites","authors":"Md. Masud Rana, Md. Hafezur Rahaman, G. M. Arifuzzaman Khan, Md. Saddam Hossain, Md. Masud Parvez","doi":"10.1002/pls2.10101","DOIUrl":"https://doi.org/10.1002/pls2.10101","url":null,"abstract":"Abstract L ‐ and D ‐ form oligo(lactic acid)s (OLLA and ODLA) grafted α‐cellulose (OLLA‐g‐cellulose and ODLA‐g‐cellulose) were prepared by the graft polycondensation reaction in C 6 H 5 CH 3 medium at 130°C and 380 mm of mercury pressure. Para‐toluene sulphonic acid (5 wt% of oligo(lactic acid)) was used as a catalyst whereas potassium persulfate (0.01 wt% of oligo(lactic acid)) was used as a co‐catalyst in the graft polycondensation reaction. OLLA and ODLA with a degree of polymerization (DP) 6–7 used in polycondensation reaction were also prepared by ring‐opening polymerization of L ‐ and D ‐lactides at 140°C for 10 h with stannous octoate (C 16 H 30 O 4 Sn) as a motivator, L , and D monomer of lactic acids as co‐motivators. FTIR analysis proved the bonding of OLLA and ODLA onto the α‐cellulose surface. The thermal properties of poly(L‐lactic) acid (PLLA) composites were explored by thermal analysis (TG, DTA, and DTG). Degradation, melting, and maximum weight loss temperature of the composites were increased with the increase of grafted cellulose up to 10% and then decreased. TG and DTA results showed that the incorporation of grafted α‐cellulose (grafted cellulose) can improve the thermal properties of PLLA composites. Highlights Synthesis of oligo(lactic acid)s from L ‐ and D ‐lactides by ring‐opening polymerization reactions. α‐cellulose extraction and graft modification with oligo(lactic acid)s. Preparation of grafted α‐cellulose composite with PLLA matrix. Evaluation of thermal properties of the grafted α‐cellulose‐reinforced composites.","PeriodicalId":488843,"journal":{"name":"SPE polymers","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135207504","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}

引用次数: 1

Magneto‐responsive polydimethylsiloxane films with magnetic powder: Characterization and potential application in the tensile loading system 磁性粉末磁响应聚二甲基硅氧烷薄膜:表征及其在拉伸加载系统中的潜在应用

SPE polymers Pub Date : 2023-09-15 DOI: 10.1002/pls2.10102

Xiaoqi Guo, Yuanwen Zou, Zhongbing Huang, Xiaohui Li

{"title":"Magneto‐responsive polydimethylsiloxane films with magnetic powder: Characterization and potential application in the tensile loading system","authors":"Xiaoqi Guo, Yuanwen Zou, Zhongbing Huang, Xiaohui Li","doi":"10.1002/pls2.10102","DOIUrl":"https://doi.org/10.1002/pls2.10102","url":null,"abstract":"Abstract Magnetic actuation has attracted a growing attention due to its non‐contact performance, rapid response and penetrability. The realization of magnetic actuation requires the participation of magneto‐responsive materials (MRMS), and magneto‐responsive polymers (MRPs) are one of the most widely used MRMs. Here, we report the fabrication, characterization and actuation tests of neodymium‐iron‐boron‐polydimethylsiloxane (NdFeB‐PDMS) magnetic films. The NdFeB‐PDMS magnetic film has great flexibility and elasticity, as well as excellent magnetism. The film also shows exceptional deformation and magnetic controllability under magnetic actuation. Besides, it can be driven under a very low magnetic field down to 1mT, and generate an out‐of‐plane displacement of 2.7 mm under the action of magnetic fields. We focus on the tensile deformation of NdFeB‐PDMS films under magnetic driving and provide a possible design for their potential application in the tensile loading system. Preliminary tests demonstrate that the size of tensile deformation is adjusted by controlling the output signal and amplification factor. Highlights Fabrication of NdFeB‐PDMS magnetic films. Mechanical and magnetic characterizations of NdFeB‐PDMS films. Magnetic actuation tests of NdFeB‐PDMS films. Magnetic field‐induced tensile deformation of NdFeB‐PDMS films. Potential application of NdFeB‐PDMS films in the tensile loading system.","PeriodicalId":488843,"journal":{"name":"SPE polymers","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135395216","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}

引用次数: 0

首页上一页