橡胶接枝苯乙烯本体共聚合全程动力学研究(Ⅰ)--接枝行为

橡胶接枝苯乙烯本体聚合的研究目前主要集中于预聚阶段接枝动力学和聚合条件对相转变的影响1]. 对于后聚阶段, 即相转变后的接枝行为, 尤其是接枝率与橡胶相内包容物的关系、接枝率与高转化率聚合动力学的关系, 接枝率与橡胶相结构的关系等则研究很少. 这些因素对最终聚合物的性能起着至关重要的作用, 因此, 研究橡胶接枝苯乙烯本体聚合相转变以后接枝率的变化, 并找出橡胶相形态演绎过程的规律很有意义.

Studies on Grafting Kinetics of Bulk Copolymerization of Styrene onto Rubber(Ⅰ)--Grafting Behavior

The difference between apparent grafting ratio and true grafting ratio in bulk graft copolymerization of styrene onto rubber and the change of rubber particle size during the overall polymerization processes were studied. The results show that, the apparent grafting ratio increased mutationally at the phase inversion and trended to level off after the phase inversion, but the true grating ratio increased gradually with the increase of conversion. At the same time, the particle size of rubber phase in the original polymerizing mixtures almost kept constant after the phase inversion. On the contrary, the size increased with the increase of conversion when the samples were dealt with multi-solution-centrifugation.