Synthesis of Water Soluble Hyperbranched Polyurethanes Using Selective Activation of AB<sub>2</sub> Monomers
作者:Steve P. Rannard、Nicola J. Davis、Ian Herbert
DOI:10.1021/ma0489218
日期:2004.12.1
The synthesis of a novel water-soluble hyperbranched polyurethane is described. The synthetic strategy involves a new approach to hyperbranched polymerization through the selective activation of the A functionality of the unprotected of AB2 monomer. 1,1‘-Carbonyl diimidazole is added at room temperature to an amino-diol monomer with the corresponding selective formation of an active carboxamide and
描述了新型水溶性超支化聚氨酯的合成。合成策略涉及通过选择性活化未保护的AB 2单体的A官能团来进行超支化聚合的新方法。在室温下将1,1'-羰基二咪唑添加到氨基二醇单体中,从而选择性地形成活性羧酰胺,并且在羟基B官能团上没有可检测到的反应。活性单体自缩合形成支化度等于0.6和M n达11000 Da的超支化聚氨酯。已经进行了一系列模型反应以确认聚合机理,并且理想情况下使用了支化的模型分子来指定15个超支化聚合物的N NMR光谱。反应条件已经改变,并且讨论了影响聚合的因素。