项目名称： 流动场下热塑性聚酰亚胺结构形态调控研究

项目编号： No.51503170

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 陈妍慧

作者单位： 西北工业大学

项目金额： 23万元

中文摘要： 热塑性聚酰亚胺（PI）具有优异的机械性能、耐高低温性能及耐辐射性能等，作为一种重要的特种工程塑料广泛应用于航空航天、武器装备、汽车、电子等领域。目前，PI研究主要关注的是合成阶段对PI分子链结构（如：分子量、分子量分布、功能基团引入等）的调控，比较忽略成型加工阶段PI聚集态结构的调控，以至于在加工过程中PI聚集态结构形态演变机理远不明确，相应的加工理论和技术也有所缺失。基于上述理由，本项目拟采用原位在线检测技术（同步辐射红外光谱、同步辐射X射线衍射）实时跟踪研究在流动场下PI刚性分子链的取向与松弛、预有序、晶核结构的形成、取向晶核生长及结晶动力学过程；重点研究流动场诱导PI聚集态结构的突变，即形成取向晶体结构的临界流动场条件；考察流动场诱导的取向晶体结构对各种物理机械性能的影响，揭示PI聚集态结构与性能的关系，为深化和拓展PI的应用领域奠定理论基础。

中文关键词： 流动场；聚酰亚胺；结构形态

英文摘要： Thermoplastic polyimide (PI), as an important special engineering plastic, have been widely used in aerospace, military weapon, automotive, and electronic fields, due its outstanding mechanical properties, excellent thermal stability, high resistance to radiations, etc. Up to now, most research of PI mainly focus on the manipulation of the molecular chains’ structure (such as molecular weight, molecular weight distribution and introduction of functional groups) in the synthesis stage, which overlook the manipulation of the aggregates’ structure during the processing stage. Therefore, the evolution mechanism of the aggregates’ structure during the processing is far from clarification, which leads to the lack of corresponding theory and technique. In this project, we plan to adopt in situ detection technologies including in situ synchrotron infrared radiation spectrum and in situ synchrotron X-ray diffraction to probe the orientation and relaxation, preorder, the formation and growth of oriented nuclei, and the crystallization kinetics of rigid molecular chains in PI upon shear flow. We will pay a close attention on the transformation of the PI aggregates’ structure upon shear flow, in order to reveal the critical flow field for the formation of oriented crystals. At last, we will study the influence of shear-induced oriented crystals on the mechanical properties, in order to uncover the relationship between the aggregates’ structure and mechanical properties. Our work are promising to give some valuable theory guidelines and technical supports for deepening and broadening the application field of PI.

英文关键词： flow field;polyimide;structure and morphology