淡江大學機構典藏:Item 987654321/50505
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    Title: The effect of ionic interaction on the miscibility and crystallization behaviors of poly(ethylene glycol)/poly(L-lactic acid) blends
    Authors: 賴偉淇;Lai, Wei-chi;Liau, Wen-bin;Yang, Ling-yueh
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: blends;miscibility;crystallization
    Date: 2008-12-01
    Issue Date: 2010-08-09 18:23:58 (UTC+8)
    Publisher: Wiley-Blackwell
    Abstract: The effect of end groups (2NH2) of poly(ethylene glycol) (PEG) on the miscibility and crystallization behaviors of binary crystalline blends of PEG/poly(L-lactic acid) (PLLA) were investigated. The results of conductivity meter and dielectric analyzer (DEA) implied the existence of ions, which could be explained by the amine groups of PEG gaining the protons from the carboxylic acid groups of PLLA. The miscibility of PEG(2NH2)/PLLA blends was the best because of the ionic interaction as compared with PEG(2OH, 1OH-1CH3, and 2CH3)/PLLA blends. Since the ionic interaction formed only at the chain ends of PEG(2NH2) and PLLA, unlike hydrogen bonds forming at various sites along the chains in the other PEG/PLLA blend systems, the folding of PLLA blended with PEG(2NH2) was affected in a different manner. Thus the fold surface free energy played an important role on the crystallization rate of PLLA for the PEG(2NH2)/PLLA blend system. PLLA had the least fold surface free energy and the fast crystallization rate in the PEG(2NH2)/PLLA blend system, among all the PEG/PLLA systems studied.
    Relation: Journal of Applied Polymer Science 110(6), pp.3616-3623
    DOI: 10.1002/app.28878
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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