透氣聚胺酯薄膜的合成及應用

Abstract

此論文主要探討聚胺酯薄膜的合成,物性,應用,及如何利用溫度的改變控制其透水蒸氣性。此論文中,我們在控制其它變數的情況下,一一改變了: 硬鍵含量,親水軟鍵含量,以及異氰酸酯數,並觀察與其相對應的機械性質改變,熱性質改變,切面表面形態改變,及透水蒸氣性質的改變。另外,我們在親水軟鍵含量,異氰酸酯數的這兩組實驗中,找到合理的數據支持聚胺酯薄膜的透水蒸氣性和溫度的關係符合阿瑞尼士方程式,而可藉此方程式預測在某一溫度下的透水蒸氣性,以達到用溫度準確控制聚胺酯薄膜透水蒸氣性能的目的。然而,在此論文發現聚胺酯薄膜在玻璃轉化溫度區間,透水蒸氣性質增加了3200 %,從實驗數據及原子力顯微鏡(AFM)中,我們得知聚胺酯薄膜軟區(Soft Domain)中的聚氧乙烯二醇(PEG)扮演最主要也最關鍵的水蒸氣輸送角色。

The study is about hydrophilic polyurethane film and its properties and applications, and how its water vapor permeability can be controlled via temperature. We varied polyurethane formulations of hard segment concentration, hydrophilic segment concentration, and isocyanate index to see how these variables affect mechanical properties, thermal properties, morphology, and water vapor permeability of the hydrophilic polyurethane film. Also, water vapor permeability at different temperature is found to be temperature dependent following Arrhenius equation. However, the water vapor permeability near glass transition temperature exhibited very different behavior and does not follow the Arrhenius equation. An abrupt 3200 % water permeability increase is observed at the glass transition temperature region. And from the experiment data and AFM (Atomic Force Microscope) we found that polyethylene glycol (PEG) of soft domain plays a critical role in water vapor permeability.