功能化丙烯腈低聚物的分子设计及其增塑熔纺PAN研究

熔纺聚丙烯腈(PAN)是一种绿色环保、高效低成本的PAN原丝制备方法，增塑是实现PAN熔纺的有效途径之一。功能化丙烯腈低聚物(LAN)既具有在加工过程中的增塑效果，又可减少PAN碳化时的缺陷，有望成为熔纺PAN的一种新型增塑剂。.本项目拟从功能化LAN的分子结构设计和LAN协同增塑PAN共聚物两方面出发，围绕可熔纺PAN流变性能和高效热稳定化展开研究，实现高丙烯腈含量PAN共聚物的熔融纺丝。(1)设计合成具有增塑和促环化的双功能性LAN，优化功能单体和链转移剂，调控分子链结构，研究其构效关系，建立调控机制。(2)研究功能化LAN协同增塑PAN共聚物的熔纺成型，明确作用机制，阐明协同增塑机理及预氧化机理。.本项目旨在协调PAN共聚物可熔纺性与环化之间的矛盾，研究和构建功能化LAN协同增塑PAN共聚物熔融纺丝新方法，丰富熔纺PAN基碳纤维加工成型的科学基础，探索熔纺PAN基碳纤维新的技术路线。

Melt-spinning polyacrylonitrile (PAN) is a green, efficient and low-cost method for the preparation of PAN fiber. Plasticizing is one of the ways to realize the melt-spinning of PAN. The functionalized acrylonitrile oligomer (LAN) is expected to be a new type of melt-spinning plasticizer for PAN, which can not only have the plasticizing effect in the melt process but also reduce defects in the carbonization process of PAN..In this project, the molecular structural design of the functionalized LAN and its collaborative plasticized melt-spinning technology of PAN were studied. The unification of melt-spinnability rheological properties and high effective thermal stabilization of PAN were studied. The melt-spinning of PAN copolymer with high acrylonitrile content was realized in the end. The first step was to design the bifunctional LAN with plasticization and cyclization-motivated effect. The functional monomer and chain transfer agent were optimized, and the molecular chain structure of LAN was regulated. The structure-property relationship and the regulation mechanism of the LAN were established. Second, the melt-spinning process of PAN copolymer with a functionalized LAN was investigated. The interaction between PAN copolymer and plasticizer molecules was investigated. Moreover, the synergistic plasticizing mechanism and thermal stabilization mechanism were also studied..The aim of this project is to coordinate the contradiction between the melt-spinnability and the cyclization of PAN copolymer. It is to establish a new way for the collaborative plasticized melt-spinning technology of PAN copolymer with a functionalized LAN. In the end, the scientific basis and a new route of melt-spinning PAN-based carbon fiber will be developed.