环氧化腰果酚增韧改性聚乳酸的性能  

Properties of Epoxidized Cardanol Toughening Polylactic Acid

作　　者：徐铭泽 王浩宇 李东翰 李龙[1,2] 康海澜 方庆红[1,2] XU Mingze;WANG Haoyu;LI Donghan;LI Long;KANG Hailan;FANG Qinghong(College of Materials Science and Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Key Laboratory for Rubber Elastomer of Liaoning Province,Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学材料科学与工程学院,辽宁沈阳110142 [2]沈阳化工大学辽宁省橡胶弹性体重点实验室,辽宁沈阳110142

出　　处：《材料科学与工程学报》2022年第1期135-142,180,共9页Journal of Materials Science and Engineering

基　　金：国家自然基金资助项目(51703133);辽宁省高等学校创新团队支持计划资助项目(LT2016013);辽宁省自然科学基金资助项目(2019-MS-263);沈阳市中青年科技创新人才支持计划资助项目(RC180154)。

摘　　要：随着石油资源的枯竭,生物基可降解高分子材料的研究热度正逐步上升。聚乳酸(PLA)由于其来源广泛,受到了人们的关注,但由于其韧性低,应用范围受限,故有必要寻找一种生物基增韧剂对PLA进行改性。腰果酚(CD)由于其广泛的生物质来源及特殊的化学结构成为这种改性剂可供选择的生物质助剂。本研究利用化学合成的方法制得环氧化腰果酚(ECD),并对产物进行微观结构表征。而后将ECD与PLA熔融共混,成功研制出了一种具有超高韧性的新型聚乳酸塑料,研究了不同ECD含量对PLA热稳定性、结晶性能以及力学性能的影响。研究结果表明:当ECD用量递增时,共混物的玻璃化转变温度、结晶温度和熔融温度都明显降低,说明ECD的加入使PLA分子链的运动能力提高;此外共混物的断裂伸长率和缺口冲击强度得到明显提升,当加入15%ECD时,断裂伸长率由纯PLA的11%提升至453%,提高了约41倍,冲击强度可达9.56 KJ/m^(2),提高了约1.8倍。With the depletion of petroleum resources,the development of biobased and biodegradable polymers has gradually become a hot topic.Polylactic acid(PLA)has attracted widespread attention because of its wide sources.However,it is limited its wide application due to its low toughness,and thus it is necessary to develop a kind of biobased toughening agent to modify PLA.Cardanol(CD)has been used as a novel biobased additive because of its biomass source and special chemical structure.Epoxidized cardanol(ECD)by was synthesized by chemical method,and characterized in this paper.A new type polylactic acid with ultra-high toughness was prepared by melt blending of ECD and PLA.The effects of different ECD contents on the thermal stability,crystallinity mechanical properties and rheological properties of PLA were investigated.With the increase of ECD content,the glass transition temperature,the crystallization temperature and the melting temperature of the blends all decreased,suggesting that the addition of ECD improved the mobility of PLA polymer chains.The elongation at break and impact strength of the blends were significantly enhanced.When the content of ECD is 15%,the elongation at break increases from 11% to 453%,which is about 41 times higher than that of pure PLA.The impact strength can reach 9.56 kJ/m^(2),which is about three times higher than that of pure PLA.

关 键 词：环氧化 腰果酚 聚乳酸 增韧 

分 类 号：TQ321[化学工程—合成树脂塑料工业]