A Facile Strategy to Enhance the Formation of Stereocomplex Crystallites in Poly(L-lactic acid)/Poly(D-lactic acid) Blend with High Molecular Weights  

作　　者：Chan-Na Zhong Ya-Dong Liu Juan Tang Wei-Shuo Chen Shuang-Cheng Li Jun Shao Hao-Qing Hou 

机构地区：[1]College of Chemistry&Chemical Engineering and Nanofiber Engineering Center of Jiangxi Province,Jiangxi Normal University,Nanchang,330022,China [2]Key Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun,130022,China [3]National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education,Jiangxi Normal University,Nanchang,330022,China

出　　处：《Chinese Journal of Polymer Science》2023年第7期1115-1122,共8页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51403089 and 21574060);the Major Special Projects of Jiangxi Provincial Department of Science and Technology (No. 20114ABF05100);the Project of Jiangxi Provincial Department of Education (No. GJJ170229);the China Postdoctoral Science Foundation (No. 2019M652282);the Postdoctoral Science Foundation of Jiangxi Province (No. 2018KY37);the Technology Plan Landing Project of Jiangxi Provincial Department of Education (No. GCJ2011-243);the Science Foundation for Excellent Young Scholars of Jiangxi Province (No. 20202ZDB01003);the Science foundation of Jiangxi Province (No. 20202BAB203008)

摘　　要：Blending of poly(levorotatory-lactic acid) (PLLA) and poly(dextrorotatory-lactic acid) (PDLA) produces the stereocomplex crystallites (PLA SC), which present higher melting temperature and mechanical properties than that of neat PLLA or PDLA. However, in the PLLA/PDLA blends with higher molecular weights, the phase separation occurs and the SC exhibits weak memory after melting, which lead to a small amount of SC together with a large amount of homochiral crystallites (HC) develop during crystallization from the melt. In this study, a small content of graphite oxide was blended with PLLA and PDLA to form ternary blends, and it was exciting to find that the formation of SC was enhanced gradually with the content of graphite oxide. The SC exclusively developed when 2 wt% graphite oxide was incorporated into the PLLA/PDLA, and the crystallinity with ∼50% was received even during fast cooling from the melt (−50 ℃/min). The acceleration formation of SC was speculated due to the interaction between PLA molecular chains and the hydroxyl groups on the surface of graphite oxide and the obstruction of proliferation of graphite oxide.

关 键 词：Poly(lactic acid)stereocomplex Graphite oxide Crystallization behavior Melt memory 

分 类 号：TB332[一般工业技术—材料科学与工程]