茂金属催化苯乙烯间规聚合的颗粒形态控制

Aiming at intricate changed multi-phases during the overall processes of syndiotactic polymerization of styrene in the presence of homogeneous metallocene catalysts because of the nucleation and growth of nascent produced semi-crystal, particle morphology of obtained syndiotactic polystyrene(sPS) and crystallization rate were investigated in comparison with the stage matching of polymerization rate, shear force intensity and even polarity and solubility parameter of system. The results have been clarified that addition of complex inert solvents and pretreated sPS seed with kind morphology and particle size or produced sPS seed in situ using semi batch process should be adopted for improvement in polymer morphology and rheology behavior in order to solve a series of the engineering problems such as good removing of reaction heat utilizing latent heat of inert solvent and without sticky residue on the wall of reactor and stirrer. And then, both lower power output of mixer and higher overall conversion can be fulfilled. Moreover, it is the key guidance for scale-up of industrialization.

针对均相茂金属催化的苯乙烯本体间规聚合过程，探讨聚合物原生晶的成核与生长机理，研究初生态结构及结晶速率的调控规律，揭示其与聚合速率、颗粒形态间的内在联系，以改善颗粒的规整性，提高体系的流动、混合和传热能力，减少催化剂活性种被包埋的几率，实现高转化聚合，为工业放大提供关键指导，同时丰富和完善非均相聚合及聚合物结晶理论。