以不同烷氧基取代的Percec型苯甲醇树形分子作为封端剂,制备3种具有相同亲水链段但末端疏水尾链数不同的聚氨酯缔合增稠剂(HEURs):HEUR-1C10(单尾)、HEUR-2C10(双尾)和HEUR-3C10(三尾).通过红外光谱和凝胶渗透色谱对HEURs的结构和相对分子质量进行了表征,并采用应力控制型流变仪研究了不同HEUR添加量的纯丙乳液的稳态及动态剪切行为.结果发现:二取代和三取代树形分子封端的HEUR-2C10和HEUR-3C10的增稠效果明显好于普通单疏水尾链封端的HEUR-1C10.这表明在亲水链段相同时,短而多的疏水链有利于增加有效网链密度,使得相邻胶束和乳液粒子之间产生更多的桥连,形成更强的疏水网络结构.本研究为新型高效聚氨酯增稠剂的制备与应用提供了有益的借鉴.
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