论文部分内容阅读
采用开环聚合法合成了一系列具有不同组成的聚(乳酸乙醇酸)(PLLGA)共聚物,并通过红外光谱(FT-IR)、核磁共振氢谱(1HNMR)、凝胶渗透色谱(GPC)、差示扫描量热分析(DSC)、X射线衍射分析(XRD)和拉仲试验,对PLLGA共聚物的化学结构、相结构、热性能、力学性能和形状记忆性能进行了系统研究,并分析了其形状记忆效应的微观机理.研究表明,通过调整PLLGA共聚物的组成,可获得良好的力学性能和形状记忆效应.对PLLGA90/10和80/20,由结晶部分及大分子链之间的缠结点共同作为固定相,无定型部分作为可逆相.而对PLLGA70/30和60/40,仅由大分子链之间的缠结点作为固定相,其无定型部分均作为可逆相.综合而言,PLLGA80/20具有最好的形状记忆效应.
A series of poly (lactic-co-glycolic acid) (PLLGA) copolymers with different compositions were synthesized by ring-opening polymerization and characterized by FT-IR, 1HNMR and GPC, , DSC, XRD and pull-pull test, the chemical structure, phase structure, thermal properties, mechanical properties and shape memory properties of PLLA copolymer were systematically studied and analyzed The micro-mechanism of its shape memory effect was studied.The results show that by adjusting the composition of PLLGA copolymer, good mechanical properties and shape memory effect can be obtained.For PLLGA90 / 10 and 80/20, the crystal structure and macromolecular chains The entangled points work together as the stationary phase and the amorphous part as the reversible phase, while for the PLLGA 70/30 and 60/40, only the entanglement points between the macromolecular chains act as the stationary phase and the amorphous part of the PLLGA as the reversible phase. In terms of, PLLGA80 / 20 has the best shape memory effect.