以聚四氢呋喃二醇、聚己二酸丁二醇酯二醇、异氟尔酮二异氰酸酯、非离子型亲水单体MO3和液体石蜡等为原料,制备了端基为—NCO基团的聚氨酯预聚体自乳化细乳液,以改进的丙酮/甲苯-二正丁胺法测定细乳液体系中-NCO基团的含量,采用红外光谱表征了自乳化细乳液中水解产物的结构;根据假设建立了细乳液中—NCO基团的水解反应模型,在不同温度和亲水单体MO3用量下对该模型进行了拟合.结果表明:聚氨酯预聚体自乳化细乳液的水解产物为聚氨酯-聚脲共聚物,拟合结果与水解反应模型的假设相符,自乳化细乳液体系中—NCO基团水解反应的表观活化能为60.2kJ·mol-1,且水解反应速率随着亲水链段含量的升高而加快.
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