聚合物多元醇分散体的流变特性

聚合物多元醇分散体(以下简称分散体)是接枝聚醚多元醇、聚醚多元醇和乙烯基单体聚合物的混合物,直接用于制备高回弹、高负载和阻燃的软质和半软质聚氨酯泡沫体,是新一代聚醚多元醇产品1].分散体用于聚氨酯工业中各种产品的生产,除要求有良好的稳定性外,其最为重要的指标是粘度应小于3000mPa·s和乙烯基单体聚合物的含量(固含量)应大于40%.但分散体的粘度,随固含量的增加呈指数性增加2].近年来,已有既具高固含量和良好稳定性,又有较低粘度的分散体的研究报道3].本文在不同的反应条件下,合成了分散体,测定了其流变特性和体系中微粒的大小…

Rheological Behavior of Polymer-Polyol Dispersions

A series of polymer-polyol dispersions have been prepared from polyether polyol and poly(styrene-acrylonitrile). The rheological behavior and particle size of the dispersions have been measured. The flow curves of the dispersions indicated the non-Newtonian behavior of shear thickening to shear thinning. The particle size in dispersions are affected by macromer content, temperature and stirring rate in preparation.