中国塑料2026，Vol.40Issue(1)：7-15,9.DOI:10.19491/j.issn.1001-9278.2026.01.002
聚乳酸水热全量解聚特性研究
Study on fully hydrothermal depolymerization characteristics of poly(lactic acid)
刘冠宇 1胡方圆 1王胤翔 1李爱民1
作者信息
- 1. 大连理工大学环境学院,辽宁 大连 116024
- 折叠
摘要
Abstract
This study investigates the degradation behavior of polylactic acid(PLA)plastic tableware and pure PLA un-der specific hydrothermal conditions(190℃).The physical and chemical changes in PLA before and after hydrothermal treatment were characterized using multiple analytical techniques,including mass loss measurements,scanning electron microscopy,high-performance liquid chromatography,and Fourier-transform infrared spectroscopy(FTIR).The kinet-ics of lactic acid generation and the evolution of macrostructure during hydrothermal depolymerization were systematically analyzed.Results indicated that solid-phase degradation of PLA reached completion(100%).The presence of lactic ac-id in solution significantly accelerated the hydrolysis of PLA without compromising the final lactic acid conversion yield(>90%).In contrast,common additives in PLA tableware,such as talc,cellulose,and other formulation compo-nents,moderately enhanced the initial hydrolysis rate but ultimately suppressed the lactic acid conversion efficiency.No-tably,polyethylene glycol exhibited a strong inhibitory effect on PLA hydrolysis.FTIR analysis revealed that hydrolysis proceeded primarily through cleavage of ester bonds,generating terminal—OH and—COOH groups.Consequently,the concentration of degradation products containing hydroxyl groups increased markedly,whereas the abundance of car-bonyl-containing species remained largely unchanged.关键词
聚乳酸/化学回收/水热降解/塑料单体Key words
polylactic acid/chemical recovery/hydrothermal degradation/plastic monomers分类
化学化工引用本文复制引用
刘冠宇,胡方圆,王胤翔,李爱民..聚乳酸水热全量解聚特性研究[J].中国塑料,2026,40(1):7-15,9.
