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以甲基丙烯酸乙酰乙酸乙酯(AAEM)为酮单体,己二酰肼(ADH)、碳酸二酰肼、草酸二酰肼和丁二酸二酰肼为肼单体,采用原位聚合法制备了系列阴离子酮肼交联改性聚氨酯-聚丙烯酸酯(PUA)分散液.通过透射电镜和动态光散射研究了乳胶粒的尺寸和微观形貌;系统分析了不同肼单体对乳胶膜的力学性能、断面微观形貌、耐水性和热性能的影响.研究结果表明,肼单体的引入可综合提高乳胶膜的吸水性、交联密度、力学性能和热性能,乳胶膜断裂由脆性断裂转变为韧性断裂.采用不同肼单体所制PUA分散液的粒径及其分布随着肼单体亲水性的增加而降低.4种肼单体中碳酸二酰肼的反应活性最高,己二酰肼的反应活性最低.采用碳酸二酰肼所制PUA乳胶膜的力学性能、耐水性和热性能最佳,其热分解活化能最高.而采用己二酰肼所制PUA乳胶膜的综合性能较差.

参考文献

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