南京工业大学学报（自然科学版）2025，Vol.47Issue(6)：651-659,9.DOI:10.3969/j.issn.1671-7627.2025.06.004
增韧聚乳酸共聚物的制备及其降解性能
Preparation and degradation performance of toughened polylactic acid copolymers
摘要
Abstract
Designing and preparing poly(L-lactic acid)(PLLA)with high toughness and faster degradation rate holds substantial theoretical and practical significance.In this study,a highly flexible polyester macromolecule(FPM)of saturated aliphatic structure was synthesized via esterification polycondensation.With FPM as the initiator,L-lactide(L-LA)was subjected to ring-opening polymerization to obtain a PLLA prepolymer,which was subsequently chain-extended to yield a high-molecular-weight PLLA copolymer,designated as PLLAFPM.The structure and properties of PLLAFPM were characterized using Fourier transform infrared spectroscopy(FTIR),proton nuclear magnetic resonance(1H-NMR),tensile testing,and degradation experiments.Results show that FPM samples(FPM1,FPM2,and FPM3)with weight-average molecular weights(Mw)of 9 023,14 962,and 24 050 g/mol,respectively,were successfully synthesized.The corresponding PLLAFPM copolymers(PLLAFPM1,PLLAFPM2,and PLLAFPM3)exhibited intrinsic viscosities of 1.91,1.89,and 1.78 dL/g and elongation at break of 103％,116％,and 148％,respectively.The elongation at break increased with increasing FPM molecular weight,whereas tensile strength decreased.Compared to PLLA,PLLAFPM copolymers exhibited a significantly accelerated degradation rate,which also increased with the molecular weight of FPM.Regulating the molecular weight of FPM enables simultaneous control of the toughness and degradation properties of PLLAFPM,providing a feasible strategy for the industrial production of high-toughness PLLA.关键词
聚乳酸/柔性聚酯大分子/扩链改性/嵌段共聚/力学性能/降解性能Key words
polylactic acid/flexible polyester macromolecule/chain-extension modification/block copolymerization/mechanical properties/degradation properties分类
化学化工引用本文复制引用
祝夫昊,齐倩倩,钟润连,王庆国..增韧聚乳酸共聚物的制备及其降解性能[J].南京工业大学学报（自然科学版）,2025,47(6):651-659,9.基金项目
国家自然科学基金(51773104) （51773104）
山东省重点研发计划(2017GGX20138) （2017GGX20138）
