利用预有序熔体结构与β晶成核剂协同调控聚丙烯β结晶的机理研究

The preparation of high content of β-phase and to efficiently control its morphologies are important ways to achieve the functionalization and high performance of isotactic polypropylene (PP). Specially, enjoying the feature that cavitation easily occurs in β-PP during stretching, β-PP can be utilized to prepare functional microporous membranes, which has great value and promising prospect in the areas of new energy materials and medical materials. However, currently the core problem in this field is how to efficiently increase the β-nucleation efficiency. In the preliminary work, we found that by the combination of PP preordered melt structures and β-nucleating agent, a surprising synergetic effect takes place, which greatly increases both the β-nucleation efficiency and β-phase content. However, the related mechanism is still unknown. The aim of this project is to investigate the roles of fusion temperature and the characteristics of β-nucleating agent in the occurrence of the synergetic effect, so as to study its mechanism in detail; Using high temperature FT-IR and high temperature SAXS, the content of preordered structures within the PP melt, as well as their ordered degree and morphology are investigated when the synergetic effect occurs, so as to elucidate the influence of synergetic effect in the β-nucleation efficiency, β-phase content and morphology. The research provides novel idea and method to prepare high content of β-phase, control its morphology efficiently, and achieve the functionalization and high performance of PP, having important theoretical significance and application prospects.

制备形态可控的高含量β晶是实现聚丙烯（PP）功能化和高性能化的重要途径，特别是利用β-PP拉伸形变时易成孔特性可制备PP功能性微孔膜，在新能源材料、医用材料等领域具有重要的研究价值和广阔的发展前景。目前该领域的核心问题是如何提高β晶成核效率。申请人前期研究发现，把PP的预有序熔体结构与β晶成核剂相结合可发生协同作用、在提高β晶成核效率和β晶含量方面取得了较大进展，然而机理有待研究。本项目旨在研究熔融温度和β晶成核剂对协同作用的影响机制，探讨预有序熔体结构与β晶成核剂之间的协同作用机理；采用高温FT-IR、高温SAXS等测试研究协同作用发生时熔体中预有序结构的含量、有序度及形貌，揭示协同作用对β晶成核效率、β晶含量、β晶形态的作用机制，为制备形态可控的高含量β晶、实现β-PP的功能化和高性能化提供新思路和新方法，具有重要的理论意义和应用前景。

制备形态可控的高含量β晶是实现聚丙烯（PP）功能化和高性能化的重要途径，特别是利用β-PP拉伸形变时易成孔特性可制备PP功能性微孔膜，在新能源材料、医用材料等 领域具有重要的研究价值和广阔的发展前景。目前该领域的核心问题是如何提高β晶成核效率。申请人前期研究发现，把PP的预有序熔体结构与β晶成核剂相结合可发生协同作用、在提高β晶成核效率和β晶含量方面取得了较大进展，然而机理有待研究。本项目研究了熔融温度和β晶成核剂对协同作用的影响机制，探讨了预有序熔体结构与β晶成核剂之间的协同作用机理；采用高温SAXS等测试研究协同作用发生时熔体中预有序结构的含量、有序度及形貌，揭示协同作用对β晶成核效率、β晶含量、β晶形态的作用 机制，为制备形态可控的高含量β晶、实现β-PP的功能化和高性能化提供新思路和新方法，具有重要的理论意义和应用前景。