软段对水性聚氨酯结构与性能的影响

Effects of Soft-Segments on the Structure and Properties of Polyurethane Emulsion

摘要: 以低聚物多元醇、异氟尔酮二异氰酸酯(IPDI)、亲水单体二羟甲基丙酸(DMPA)，乙二胺为主要原料，制备了一组不同组成的聚氨酯乳液。通过粘度测定、粒度分析、力学性能和耐水性能测试、原子力显微镜(AFM)分析，研究了软段类型、软段分子量对乳液及其胶膜性能的影响。结果表明，分子结构规整、易结晶的软段合成的聚氨酯树脂力学性能和耐水性能都较好，对聚己二酸酯而言，分子量减小，其合成的水性聚氨酯拉伸强度提高，耐水性能却有很大程度的下降。

Abstract: Ionomer-type polyurethane emulsion was prepared from pelyether or polyester , IPDI, dimethylol propionic acid (DMPA) and ethylene diamine as primary materials. The emulsion characteristics and properties of PU films were studied by means of rotational vis