Effect of Macromolecular Chain Movement and the Interchain Interaction on Crystalline Nucleation and Spherulite Growth of Polylactic Acid under High-Pressure CO2

• DOI: 10.1021/acs.macromol.9b01601
• Publication Date: 2019-12-18T11:33:12Z
• Authors: Shaojie Li; Taoyi Chen; Xia Liao; Weiqiang Han; Zhihui Yan; Junsong Li; Guangxian Li
• Keywords: Spherulite (polymer physics); Lamella (surface anatomy); Branching (polymer chemistry); Polylactic Acid; Supersaturation; Saturation (graph theory)

Crystallization behavior of polylactic acid (PLA) under CO2 is meaningful due to its effect on foaming during foaming, while present studies mainly concentrated overall crystallization behavior. In this study, the nucleation and spherulite growth PLA crystals was in situ investigated separately. During saturation, sorption diluted molecular chain density, thus increasing mobility weakening interchain interaction, which reduced amount crystal nuclei PLA. On other hand, rate at high temperature increased low attributed enhanced CO2. Thus, controlled by crystalline Besides, restricted lamella branching, resulting an thickness z axis size. Current results revealed tunable interaction adjusted