Md. Masud Rana, Md. Hafezur Rahaman, G. M. Arifuzzaman Khan, Md. Saddam Hossain, Md. Masud Parvez
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.
摘要在c6h5ch3介质中，在130℃、380 mm汞压下，通过接枝缩聚反应制备了L -和D -型低聚乳酸s (OLLA和ODLA)接枝α -纤维素(OLLA - g -纤维素和ODLA - g -纤维素)。对甲苯磺酸(5%的低聚物(乳酸))作为催化剂，过硫酸钾(0.01%的低聚物(乳酸))作为接枝缩聚反应的共催化剂。以八酸锡(c16h30o4sn)为催化剂，乳酸单体L和D为助催化剂，在140℃下开环聚合10 h，制备了聚合度(DP)为6-7的la和ODLA。FTIR分析证实了α -纤维素表面的OLLA和ODLA结合。通过热分析(TG、DTA和DTG)研究了聚乳酸(PLLA)复合材料的热性能。随着接枝纤维素用量的增加，复合材料的降解、熔融和最大失重温度均呈先升高后降低的趋势。TG和DTA结果表明，接枝α -纤维素(接枝纤维素)的掺入可以改善PLLA复合材料的热性能。L -和D -丙交酯开环聚合反应合成低聚(乳酸)s。α -纤维素萃取及低聚乳酸接枝改性。PLLA接枝α -纤维素复合材料的制备。接枝α -纤维素增强复合材料的热性能评价。
{"title":"Effects of <scp><i>L</i></scp>‐ and <scp><i>D</i>‐</scp> form oligo(lactic acid)s grafted cellulose reinforcement on the thermal properties of poly(<scp><i>L</i></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}
Xiaoqi Guo, Yuanwen Zou, Zhongbing Huang, Xiaohui Li
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.
{"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}
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