合成了一系列水性聚氨酯,并用红外光谱、差示扫描量热仪对乳液胶膜进行表征,考察了软段组成、DMPA含量及n(-NCO):n(-OH)比值对产物微相分离的影响.实验结果表明:聚醚型产物的微相分离程度高于聚酯型产物.提高DMPA用量,软段Tg移向低温区,说明体系的微相分离程度加大.随着n(-NCO):n(-OH)比值的增大,软段Tg也移向低温区,软硬段的微相分离程度增大.
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