多相多组分聚烯烃产品在聚合过程中的结构调控

The focus of this project is gas-phase (co)polymerization of olefins catalyzed using spherical porous supported Ziegler-Natta catalysts and olefin slurry (co)polymerization with supported living coordination polymerization catalysts. An atmosphere switching polymerization reactor technology will be used for experimental study and their results will be applied to theoretical analysis and process modeling development. The model will include formation of molecular and particle (i.e. agglomerate) structures of the multiphase and multicomponent polymer, and their control mechanism by catalyst and atmospheric conductions such as monomer concentrations and residence times. The effects of catalyst and reactor space-time structure on molecular and aggregation structures of the produced polymers, the quantitative relations between molecular and aggregation structures, and the relationship between the polymer structures and their mechanical and physical properties will be explored. The formation mechanism of these meso-scale problems as well as their evolution and stabilization conditions will be established. It will offer theories and examples to help establish of research paradigms for the multiphase and multicomponent polymer product engineering and application of mesoscopic science into the research of multiphase polymerization. Furthermore, it will provide significant technical guidelines for the transition and upgrade of the Chinese polyolefin industry.

本项目拟针对球形多孔Ziegler-Natta催化剂催化的烯烃气相（共）聚合过程和负载型活性配位聚合催化剂催化的烯烃淤浆（共）聚合过程，以实验、理论分析和建模计算为手段，利用自创的气氛切换反应器技术和以聚合动力学为基础的过程模型化技术，研究多相多组分聚烯烃产品的分子结构和原生聚集态结构的形成机理，以及催化剂、反应器内“气氛”周期性“切换”（反应物浓度与停留时间的变化）等对这两重结构的控制机制，阐明催化剂和反应器时空结构对聚合物分子结构、原生聚集态结构的影响规律，聚合物分子结构与原生聚集态结构的关系，以及这两重结构与产品机械物理性能的关系，揭示这些介尺度问题的形成机制、演化规律和稳定条件，为多相多组分聚合物产品工程研究范式的建立和多相聚合过程中介尺度研究方法的应用提供理论与实践基础，并为我国聚烯烃工业的转型升级提供重要的技术指导。

本项目较深刻地阐明了负载型球形Ziegler-Natta催化剂、均相茂金属催化剂和反应器时空结构对聚烯烃分子结构、聚烯烃原位合金（即原生聚集态）结构的影响规律；这两层次结构的相互关系，以及它们与相应产品的机械物理性能的关系；揭示了它们的形成机制、演化规律和稳定条件。在各种均聚和共聚反应动力学研究的基础上，创建了基于反应器内单体组分可控切换，基于气相组成瞬间在线检测，以及基于串级催化与序贯聚合的聚合产物分子与原生聚集态结构调控新技术；为多相多组分聚烯烃产品的工程研究和烯烃聚合过程研究提供了理论基础及方法。创制了iPP/(B-co-P)原位合金、HDPE/LLDPE（POE）原位合金、CPOE热塑性弹性体等高性能聚烯烃新品种。