Studies on the structure-property relationship of a biodegradable polymer blend system, PEG/PLLA
Date Issued
2004
Date
2004
Author(s)
Lai, Wei-Chi
DOI
zh-TW
Abstract
The effect of end groups (2OH, 1OH-1CH3, 2CH3 and 2NH2) of poly(ethylene glycol) (PEG) on the miscibility, crystallization behaviors and morphology of binary crystalline blends of PEG/poly(L-lactic acid) (PLLA) were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and so on. The focus of this study was on the structure-property relationship of PEG/PLLA blends. In this system, the thermo-oxidative degradation of PEG and PEG/PLLA blends occurred after aging in air at 80℃ for a period time. Besides, the PEG(2NH2)/PLLA blend system was a special case because of the existence of ionic pairs. From the results of DSC analysis, a single glass-transition temperature was observed with a weight ratio of 10/90. The equilibrium melting point of PLLA decreased with the increasing PEG. A negative Flory interaction parameter
Subjects
結晶動力學
形態學
摻合物
相容性
分解性質
聚乳酸
聚乙二醇
Crystallization
Morphology
Degradation
PLLA
PEG
Blends
Miscibility
Type
thesis
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