生物质化学工程2025，Vol.59Issue(2)：23-29,7.DOI:10.3969/j.issn.1673-5854.2025.02.004
木质素-聚乳酸-聚己内酯嵌段共聚物对聚乳酸复合膜降解性能的影响
Effect of Lignin-PLA-PCL Block Copolymer on the Degradation Properties of Polylactic Acid Composite Films
摘要
Abstract
Lignin(L),L-propylcaprolactone and ε-caprolactone(ε-CL)were used as raw materials to prepare lignin-poly(lactic acid)-poly(caprolactone)block copolymers(L-PLA-PCL)via ring-opening polymerization,and PLA composite films(L-PLA-PCL/PLA)were prepared by blending with PLA.As a biomass functional filler,L-PLA-PCL increased the tensile strength from 39.2 MPa(PLA)to 41.8 MPa,the elongation at break increased from 2.5％(PLA)to 27.4％,and UV transmittance decreased from 91％(PLA)to 81.4％.The effects of L-PLA-PCL on the mass loss,melting crystallization properties and microstructure of PLA composite films in phosphate buffers with different pH values were investigated.The results showed that the addition of L-PLA-PCL changed the degradation behavior of L-PLA-PCL/PLA,and the degradation rate of PLA films was the highest in phosphate buffer with pH value of 6,with a weight loss rate of 48.13％after 60 d.The degradation of the matrix material mainly occurred in the amorphous region of the films.The L-PLA-PCL/PLA composite film degraded fastest in phosphate buffer with pH value of 8,with a weight loss rate of 39.23％after 60 d.The degradation of the matrix material mainly occurred on the surface of the film.L-PLA-PCL degraded first within the PLA composite film.It causes structural damage to the surface and interior of the L-PLA-PCL/PLA composite film during the degradation process.The L-PLA-PCL/PLA composite film had excellent mechanical properties and UV-shielding properties,and showed a comparable degradation ability to PLA film,which was an ideal degradable biomass composite material.关键词
木质素/聚乳酸/降解/结晶度/微结构Key words
lignin/polylactic acid/degradation/cystallinity/microstructure分类
化学工程引用本文复制引用
郑倩男,王邓峰,刘琳..木质素-聚乳酸-聚己内酯嵌段共聚物对聚乳酸复合膜降解性能的影响[J].生物质化学工程,2025,59(2):23-29,7.基金项目
国家自然科学基金资助项目(22375181) （22375181）
