文献类型：期刊文献

英文题名：Study on the long-range chain degradation behavior of polylactic acid promoted by nanometer zinc oxide

作者：Yang, Le Qin, Yin Li, Yang Wang, Bangsheng Chen, Huabi Luo, Zhu

第一作者：杨亮

通信作者：Luo, Z[1]

机构：[1]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550025, Peoples R China;[2]Guizhou Univ, Coll Mat & Met, Dept Polymer Mat & Engn, Guiyang 550025, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Univ, Coll Mat & Met, Dept Polymer Mat & Engn, Guiyang 550025, Peoples R China.

年份：2024

卷号：39

外文期刊名：MATERIALS TODAY COMMUNICATIONS

收录：;EI(收录号：20241815995554);Scopus(收录号：2-s2.0-85191295381);WOS:【SCI-EXPANDED(收录号:WOS:001235991300001)】；

基金：This work was financially supported by Science and Technology Plan Project of Guizhou Province (Qian Ke He JiChu ZK [2022] 185) , the Youth Science and Technology Project of Guizhou Provincial Education Department (Qian Jiao He KY [2022] 354) , the Special Project of Academic New Seedling Cultivation and Innovation Exploration of Guizhou Institute of Technology (GZLGXM-23) and High-level talents start-up funding project of Guizhou Institute of Technology (2023GCC006) .

语种：英文

外文关键词：Polylactic acid; Long-range degradation; Statistical method; Molecular weight testing; Nano-ZnO

摘要：Polylactic acid (PLA) is known for its degradative properties. Since PLA possesses a long chain macromolecular structure, its degradation behavior and characteristics have been the focus of research. In the presence of Lewis acid, the carbonyl oxygen in the ester group of PLA molecular chain can coordinate with it and be activated, so as to break the ester group and cause PLA degradation. However, there is still a lack of research strategies on the evolution of the remote structure of PLA chains, and there were few studies on the long-range degradation of PLA molecular chain in the effect of Lewis acid. In this work, a statistical method, combined with molecular weight testing, was proposed to investigate the long-range degradation behavior of PLA molecular chains. Results showed that in the presence of nano-ZnO, the long-range degradation of PLA molecular chain in solution was initially carried out in the form of terminal group biting-back and exchanging within 4 hours, and the molecular chain with new terminal-group was still long enough after degradation, gradually shortened over time. PLA began to degrade obviously after 8 h reaction. This chain scission method can provide a reaction platform for some reactions such as long-chain branching, which can be utilized to prepare PLA with special molecular chain topology and explore the mechanism of PLA chain structure transformation.