Open AccessHighly crystallized poly (lactic acid) under high pressure
Author(s) -
Jin Zhang,
DingXiang Yan,
JiaZhuang Xu,
HuaDong Huang,
Jun Lei,
ZhongMing Li
Publication year - 2012
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4769351
Subject(s) - crystallization , crystallinity , lamellar structure , materials science , crystallite , chemical engineering , lactic acid , polylactic acid , high pressure , composite material , polymer , thermodynamics , metallurgy , geology , bacteria , engineering , paleontology , physics
Biodegradable poly (lactic acid) (PLA) usually has a crystallinity less than 10% due to its poor crystallization ability. In this work, we found high pressure could significantly facilitate formation of crystallites of PLA, resulting in a crystallinity high up to 66.3% at pressure and temperature of 300 MPa and 185 ºC. High-pressure induced crystalline reorganization and lamellar thickening led to two melting temperatures in the highly crystallized PLA but without cold crystallization compared to the normal-pressure crystallized PLA. Temperature dependence of high-pressure crystallization of PLA suggested desirable crystallization temperatures for highly crystallized PLA products
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