用溶剂溶胀平衡法测定了聚氨酯单一网络的单位体积内有效交联链的数目和交联点间平均分子量。
The number of effective crosslinking chains per unit volume (ve) and the average molecular weights between crosslinks (Mc) were determined by means of equilibrium swelling measurement.
当反应程度达到60%左右后，由于交联程度增加，分子质量迅速增大，分子间扩散较慢，进入反应的第二阶段，主要由扩散作用控制固化速率。
When the curing extent was about 60 percent, the molecular weight raised rapidly and diffusion control was incorporated to describe the cure in the latter stages.
NCO与水的反应、多异氰酸酯难于在多元醇中的分散均匀以及组份间分子链扩散交联不充分，是研究水性双组份聚氨酯的关键问题。
The reaction between -NCO and water, dispersion of polyisocyanates in polyols, and complete diffusion among different kinds of molecules are key problems to be solved in 2k-WPU.
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