结晶
过冷
材料科学
等温过程
无定形固体
玻璃化转变
热力学
相(物质)
高分子化学
化学工程
聚合物
结晶学
复合材料
化学
有机化学
物理
工程类
作者
S. Iannace,Luigi Nicolais
标识
DOI:10.1002/(sici)1097-4628(19970502)64:5<911::aid-app11>3.3.co;2-n
摘要
Isothermal melt crystallization of poly(L-lactide) (PLLA) has been studied in the temperature range of 90 to 135°C. A maximum in crystallization kinetic was observed around 105°C. A transition from regime II to regime III is present around 115°C. The crystal morphology is a function of the degree of undercooling. At crystallization temperatures (Tc) below 105°C, further crystallization occurs upon heating; this behavior is not detected for Tc above 110°C. The analysis of the heat capacity increment at glass transition temperature (Tg) and of dielectric properties of PLLA indicates the presence of a fraction of the amorphous phase which does not relax at the Tg, and the amount of this so-called rigid amorphous phase is a function of Tc. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 911–919, 1997
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