温度自适应调温纤维的熔纺芯核动态光聚合及其热量管理构效关系研究

调温纤维是一类可自动吸释热量并维持温度平衡的功能纤维，在极端环境防护中具有重要应用，但目前调温纤维的熔融纺丝成形却面临众多困难。本课题拟在皮芯纤维熔纺过程中创新性引入动态光聚合，通过功能单体的在线反应克服高分子链微交联结构与纺丝线上纤维结晶与取向不匹配的难题，从而实现一步法熔纺制备温度自适应调温纤维。重点探讨功能单体配比、光聚合强度、温度应力等工艺参数对纤维熔纺成形动力学、芯层光聚合反应动力学及其微结构演变、皮芯界面结构稳定性的影响关系，建立一种皮芯纤维熔融纺丝与光引发在线聚合的成形方法及调控机制，揭示目标纤维在多环境外场下热量传递效率对其聚集体功能表达的影响规律，从而实现对纤维成形方法、纤维微结构和效能表达的有效调控。通过本课题的研究，不仅可以获得高焓值、高温度敏感性的熔纺调温纤维，还能建立一种通用功能纤维的动态光聚合熔纺成形新方法，为推动功能纤维新材料的发展提供理论依据和技术支撑。

Phase change fibers (PCFs)，as a type of functional fibers that can automatically absorb and release heat and maintain temperature balance, have important applications in extreme environmental protection, but currently melt-spun PCFs face serious difficulties. This project intends to prepare melt-spun phase change fibers via photopolymerization of core liquid macromonomers. Following the introduction of dynamic photopolymerization into traditional melt spinning, the disparity between polymer chain micro-crosslinked structure and fiber crystal orientation along the spinning line will be overcome by crosslinking of functional monomers. Detailed investigations on how raw material ratio, photopolymerization and external field temperature stress parameters influence the melt spinning fibre kinetics, core layer microstructure evolution and stability of the core layer interface structure are expected to be conducted. Moreover, establish a molding method and control mechanism of melt-spinning and photo-initiated on-line polymerization of sheath-core fibers, and reveal the effect of heat transfer efficiency of target fibers on the expression of their aggregate functions in multi-environment external fields, so as to achieve fiber forming methods, effective regulation of fiber microstructure and potency. It is finally anticipated that phase change fibers with high enthalpy and temperature sensitivity will be obtained after optimizing and regulating the ratio of raw materials, photopolymerization and the fiber forming process. Therefore, the proposed project will lead to establishment of a new dynamic photopolymer melt spinning molding method to develop a general functional fiber and provide theoretical guidance aimed towards the development of new intelligent fiber materials.