绿色包装材料聚乳酸的降解行为研究进展OA

Polylactic acid(PLA),as a green packaging material to address white pollution,has attracted considerable attention regarding its degradation behavior and environmental value.The article reviews the degradation mechanisms of PLA,which are dominated by hydrolysis,and indicates that the degradation process is influenced by multiple factors,including its own structure and external environmental conditions.The degradation of PLA is governed by three key factors:The hydrolytic reactivity of the ester bonds in the polymer backbone,the crystalline-to-amorphous ratio(dictated by monomer stereoregularity),and the molecular weight and its distribution.The degradation of PLA involves multiple mechanisms,including hydrolysis,microbial enzymatic degradation,photodegradation,and thermal degradation.Modification approaches such as copolymerization and blending can effectively intervene in the degradation rate.PLA can achieve a degradation cycle under industrial composting conditions and eventually undergo complete mineralization without generating permanent microplastics.PLA has significant environmental potential in the packaging field,but the controllability of its degradation efficiency and the compatibility with backend treatment systems remain key directions for future research and practice.