文献类型：期刊文献

英文题名：Preparation of biodegradable PBST/PLA microcellular foams under supercritical CO2: Heterogeneous nucleation and anti-shrinkage effect of PLA

作者：Chen, Peng[1];Gao, Xiulu[1];Zhao, Ling[1,2];Xu, Zhimei[1];Li, Naixiang[3];Pan, Xiaohu[3];Dai, Junming[3];Hu, Dongdong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]Xinjiang Univ, Coll Chem Engn, Urumqi 830046, Peoples R China;[3]Yizheng Chem Fiber Co Ltd, Sinopec Res Inst, Yizheng 211900, Peoples R China

年份：2022

卷号：197

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20220611593910);WOS:【SCI-EXPANDED(收录号:WOS:000763040900003)】；

基金：The authors are grateful to Natural Science Foundation of Shanghai (20ZR1413700), National Natural Science Foundation of China (21706063), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Poly(butylene succinate-co-butylene terephthalate); Poly (lactic acid); Supercritical CO2; Microcellular foam; Anti-shrinkage

摘要：A series of fully biodegradable poly(butylene succinate-butylene terephthalate) (PEST)/poly (lactic acid) (PLA) microcellular foams were prepared by using supercritical carbon dioxide as the blowing agent. The addition of PLA exhibited a typical "sea-island" morphology, which could not only increase the crystallization temperature of PEST, but also improve the rheological properties of PEST in the low frequency region. The uniform microcellular structure with the smallest cell diameter (7.1 mu m) and the highest cell density (3.5 x 10(10) cells/cm(3)) was successfully prepared with 20 wt% PLA blend at 90 degrees C. PLA mainly played a role of heterogeneous nucleation in the foaming process when the content increased from 0 to 20 wt%. With the further increased content, PLA affected the foaming process by regulating the solubility and diffusion behavior of CO2 in the blends, resulting in severe cell collapse and coalescence. The 80/20 blend of PEST and PLA exhibited the highest expansion ratio of 17 without shrinkage. The existence of PLA could facilitate the formation of open-cell structure and enhance the rigidity of the blends, effectively solving the shrinkage problem of PEST foams. (C) 2022 Elsevier Ltd. All rights reserved.