高聚物的凝胶化理论已有不少报道,但对聚氨基甲酸酯系统需提出特定的模型.本文根据聚氨基甲酸酯形成过程中存在的各种反应,建立了新的凝胶化模型.经过统计处理,即假设中心官能团重现系数等于1作为凝胶化临界条件,导得了聚氨基甲酸酯体系的凝胶化数学关系式.其简化模型所得凝胶化条件与文献中导得结果完全相同. Many reports have been made on the theory of gelation of polymers, but a specific model has to be proposed for the polyurethane system.In this paper, based on the various reactions existing in the formation of polyurethane, a new gel After statistical processing, which assumes that the central functional group reproducibility coefficient is equal to 1 as the critical condition of gelation, which leads to the gelation of polyurethane system mathematical relationship between the gelation conditions obtained by the simplified model and the literature The result is exactly the same.