合成了系列水性聚氨酯分散液 ,就分子链软段中亲水性链段聚乙二醇 (PEG)含量对聚氨酯涂膜结晶性的影响进行了探讨 .结果表明 ,水性聚氨酯膜中存在三种结晶微区 ,每一结晶微区熔融温度均随 PEG含量的变化而变化 ,且软段结晶形态与 PEG、聚己二酸丁二醇酯二醇 (PTAd)结晶形态相同 ,晶胞参数随 PEG含量的增加而增大 ,但较 PEG和 PTAd为小 .A series of water- borne polyurethanes were synthesized,and the effect of PEG content in soft- segment on the crystallization of their cast films was studied.The results indicate that there are three kinds of crystalline domains in the cast film,each of their melting points varies with the PEG content,and the form of the soft- segment crystal is the same as the ones of PEG and PTAd.Moreover,their cell parameters increase with the PEG content and are smaller than those of PEG and PTAd
