通过引入三羟甲基丙烷(TMP)交联剂和丙烯酸羟乙酯(HEA)偶联剂,采用种子乳液聚合法制备了系列阳离子聚氨酯-聚丙烯酸酯(PUA)分散液.系统分析了TMP和HEA用量对分散液粒径、流变行为以及胶膜力学性能的影响.单独引入TMP,分散液粒径增加,储能模量增加,损耗模量减小,相容性增加,胶膜的断裂强度增加,断裂伸长率下降;但过量的TMP会导致损耗模量和弹性急剧增加,分散液出现相分离行为,稳定性下降.单独引入适量HEA,分散液粒径减小,分散液由粘性向粘弹性行为转变,同时由牛顿流体转变为假塑性流体,乳胶粒间相互作用增强,分散液呈现反触变性.同时引入TMP和HEA,固定TMP用量为0.4％,随着HEA用量的增加,分散液从正触变性转变为复合触变性,黏度增加,乳胶粒间的相互作用增加,假塑性和触变性增强,胶膜的力学性能得到明显改善.
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