Reactive processing of poly(lactic acid)/poly(ethylene octene) blend film with tailored interfacial intermolecular entanglement and toughening mechanism

作     者：Wenjun He Lin Ye Phil Coates Fin Caton-Rose Xiaowen Zhao Wenjun He;Lin Ye;Phil Coates;Fin Caton-Rose;Xiaowen Zhao

作者机构：State Key Laboratory of Polymer Materials Engineering of ChinaPolymer Research Institute of Sichuan UniversityChengdu 610065China School of EngineeringDesign and TechnologyUniversity of BradfordBradfordUK 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第98卷第3期

页      面：186-196页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by the National Natural Science Foundation of China(No.51773122 and No.51933007) the International Scientific and Technological Cooperation Project of Sichuan Province(No.2020YFH0084) 

主　　题：Poly(lactic acid)/poly(ethylene octene)(PLA/POE)blend film Reactive processing Tailored interfacial intermolecular interaction Long-chain branched structure Toughening mechanism 

摘      要：In order to obtain a uniform and effectively toughened poly(lactic acid)film by blending with low content of poly(ethylene octene)(POE)with high elasticity,the tailored interfacial intermolecular interaction and entanglement between the two phases of the PLA/POE blend was innovatively constructed via the facile reactive melt blending process through the reaction of the epoxy/anhydride groups grafted on the POE chains with the end groups of PLA chains(PLA/GPOE-MPOE).It was observed that POE domains were embedded tightly in PLA matrix with a fuzzy interface and abundant interface transition area,and the impact fractured surface of the blend showed an obvious plastic deformation with less occurrence of fibrillation of PLA matrix or interfacial *** with neat PLA and directly blended PLA/POE blends,the PLA/GPOE-MPOE blend exhibited much higher complex viscosity/storage modulus,much lower tanδvalues in the terminal region,and obvious strain-hardening *** deviation in viscoelastic behavior of PLA/GPOE-MPOE from linear PLA indicated the enhanced molecular entanglement between the long-branched chains,resulting in an enhancement of the stretching ability during biaxial drawing of the *** PLA/GPOE-MPOE films with draw ratio as high as 7×7 were obtained through biaxial stretching,which showed much higher tensile strength and the elongation at break than that of neat PLA and PLA/POE *** work provides a facile method for fabricating toughening PLA films with application potentials.