采用聚四氢呋喃醚二醇(PTMEG,Mn=2 000)、异佛尔酮二异氰酸酯(IPDI)和1,4-丁二醇(1,4-BD)为主要原料合成了非离子水性聚氨酯乳液.采用三羟甲基丙烷聚乙二醇单甲醚(TMPEG,Mn=1200)作为非离子型亲水扩链剂,将重复的(-CH2CH2O-)引入聚氨酯大分子中,作为侧链.采用傅里叶变换红外表征了非离子聚氨酯的结构.使用电子拉力试验机研究了氰羟比R值[n(-NCO)/n(-OH)]、交联剂三羟甲基丙烷(TMP)和后扩链剂乙二胺(EDA)的用量对非离子型水性聚氨酯力学性能和吸水溶胀比的影响.透射电镜(TEM)图片和乳液粒径测试证实了非离子聚氨酯能够很好地分散在水中,并且粒径随TMPEG用量增大而减小.研究结果表明,R值的增大和TMP、EDA用量的提高都使得胶膜拉伸强度增大,而断裂伸长率和吸水溶胀比下降.
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