反应性微凝胶分散液的流变性能

Rheological properties of reactive microgels solution

为了在实际应用中更好地利用反应性微凝胶分散液的流变特性,采用自稳定分散聚合的方法合成了带有环氧基或羧基的反应性微凝胶,并研究了其在不同溶剂中的流变性能。结果表明,与相应的线形聚合物相比,当相对分子质量一定时,反应性微凝胶分散液的特性黏度较低,对聚合物相对分子质量依赖性较小;随着反应性微凝胶交联度的增加,特性黏度变小。在二甲苯中,随着反应性微凝胶质量分数的增加,分散液逐渐由牛顿流体转变为非牛顿流体,且随着反应性微凝胶质量分数的增加,假塑性增加。在甲苯、苯乙烯(St)或甲基丙烯酸异冰片酯(IBOMA)稀溶液中,反应性微凝胶的官能团种类对特性黏度的影响较弱,官能团种类对高浓度溶液的流变性能有较大的影响。

To apply the theological properties of reactive microgels solution in practical application, reactive microgels with epoxy or carboxyl groups were synthesized by self-stabilized dispersion polymerization. The rheological properties in different solvents of the reactive microgel were studied respectively. The results show that with a given relative molecular mass, the intrinsic viscosity of the reactive microgel is much lower than that of linear polymers, and the viscosity of the microgel depends much less on the relative molecular mass of the polymer. With the increase of the crosslinking degree of the reactive microgel, the intrinsic viscosity decreases. In xylene, the liquid type changes from Newtonian liquid to Non-Newtonian liquid and pseudoplastic increases by increasing the reactive microgels mass fraction. No signifi reactive microgel solutions in toluene, in s cant difference was observed on the intrinsic viscosity measures of dilute tyrene, or in isobornyl methacrylate （IBOMA）. However, the solvent and the functionality of carboxyl or epoxy have relatively higher influence on the rheological properties of concentrated reactive microgels solutions.