针对聚双环戊二烯(PDCPD)聚合反应过程难以控制和易燃等问题，本项目拟设计含阻燃基元的降冰片烯单体，通过它们与DCPD单体的前端开环易位共聚合反应(FROMP)，将磷氮、硅系和苯基马来酰亚胺阻燃基元引入PDCPD中，实现本征阻燃PDCPD的高效合成。研究降冰片烯单体结构和降冰片烯基元含量，共聚单体比例变化对PDCPD聚集态结构和机械、阻燃性能的影响，探讨其结构与性能之间的关系。重点研究本征阻燃PDCPD燃烧过程中，气相和凝聚相的物理转变和化学反应机理，探讨各阻燃基元逐步和多层次的引入，对PDCPD燃烧过程中裂解产物和炭层结构、组成和性能的影响，阐明阻燃基元间的协效阻燃机制，建立“阻燃共聚单体结构-FROMP工艺-聚集态结构-阻燃和机械性能”之间的构效关系，总结其规律，为高效合成本征阻燃的PDCPD树脂提供理论基础和技术途径。

Polydicyclopentadiene (PDCPD) is kind of a high-performance engineering plastics, but its relatively complex polymerization technology and flammability have greatly limited the application in many fields. Hence, in this project, the norbornene monomer (NB-M) containing flame retardant groups such as phosphorus/nitrogen, silicon and phenyl maleimide will be designed and synthesized, and then subsequent frontal ring-opening metathesis polymerization(FROMP) will be conducted with comonomer dicyclopendiene (DCPD) to prepare a series of intrinsic flame retardant PDCPD materials. The effects of NB-M’s structure and its norbornene group contents as well as its copolymerization feed ratio with DCPD on the aggregation structure of resultant PDCPD and the relationship with mechanical properties and flame retardancy will be investigated. Furthermore, the physical changes and chemical reactions of gas phase and condensate phase during combustion of intrinsic flame retardant PDCPD will be principally studied, and the effects of the gradual and multi-level introduction of flame retardant elements on the structure, composition and properties of pyrolysis products and carbon layers during combustion will also be investigated. Finally, the mechanism of synergistic flame retardancy of different flame retardant elements in PDCPD will be elucidated as well. Eventually, we intend to provide a deeper understanding of fundamental relationships between molecular structure of NB-M, FROMP technique, aggregate structure and flame retardancy and mechanical properties of resulting PDCPD materials. Therefore, this project provides a versatile and energy-efficient strategy for PDCPD materials with high flame retardance and tunable comprehensive physical and mechanical properties, showing both scientific significance and application prospects.