The effect of PEG end group on the membrane structure and properties of PLLA/PEG blends
Date Issued
2005
Date
2005
Author(s)
Chang, Jen-Fang
DOI
zh-TW
Abstract
The study focuses on the effect of PEG with different end groups blending PLLA to prepare membranes by wet casting method. In this work, owning to the miscibility of two polymers, PLLA and PEG were thought as one phase, 1,4-dioxane was the solvent and n-Heptane was the non-solvent. Via the phase diagram, it was realized how liquid-liquid de-mixing and solid-liquid de-mixing varied with the end groups of PEG. The structure of membranes prepared with different end groups of PEG and the concentration of casting solutions can be observed clearly by SEM. The structures of PLLA/PEG(2CH3), (1OH-1CH3), and(2OH) were observed varying with the concentration of casting solutions; nevertheless, the structures of PLLA/PEG(2NH2) were found dissimilar with others. Besides, the viscosity of PLLA/PEG(2NH2) casting solution measured by the Ubbelohde viscosmeter was extreme lower than others. Through the above work, it was found how PEG end groups affected the structures of PLLA/PEG membranes.
Subjects
聚乳酸
聚乙二醇
末端基效應
黏度
摻合物
薄膜
相圖
相轉換法
PLLA
PEG
end groups effect
viscosity
blend
membrane
phase diagram
phase inversion
Type
thesis
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