连续有序PP横晶在微纳层状受限空间里的构筑及其性能研究

在层状受限空间里构筑连续有序横晶是实现PP基微纳材料高性能和功能化的有效途径。本项目首次利用微纳层共挤出的限位效应将α或β成核剂定向分布在PP膜的特定区域，形成PP层和PP/成核剂层交替排列的连续层状结构，在层状受限空间里构筑连续有序的α或β横晶。深入研究α和β横晶在不同尺度层状受限空间（微米级到纳米级）里的结晶行为，实现PP横晶结构和形态的可调控。在此基础上，进一步研究α和β横晶的增强增韧机制，以及α和β横晶的气体阻隔性能和拉伸成孔性，制备高性能和功能化的PP基微纳材料。本申请项目针对PP横晶的研究的现状和发展趋势，围绕基本科学问题开展微纳层共挤出PP膜加工-结构-性能之间相互关系的研究，将为构筑连续有序PP横晶提供新思路和新方法、加深对PP横晶基本性质的理解、为实现PP基微纳材料的高性能和功能化提供新理论，具有重大的理论和现实意义。

It has been well established that fabricating the successional and orderly transcrystallization in the confined layered space is one of simple and efficient approaches to achieve the high performance and multi-functional micro- and nano-materials based on polypropylene matrix. We firstly take advantage of the confinement effect of layer-multiplying coextrusion to compel α or β nucleating agent to be selectively distributed in the particular layer. In this multiplied composites, the alternating multilayer composites consist of polypropylene layer and nucleating agent filled-polypropylene layer, and numerous α or β-transcrystallization are generated in this particular confined layer. We aim to gain the tunable structure and morphology of PP- transcrystallization through deeply investigating the crystallization behavior of α or β-transcrystallization in different confined scale gap (micro-scale or nano-scale). Based on the above research, the reinforcement and toughening mechanism of α and β-transcrystallization and will be further probed. Also the behavior of gas barrier and microporous membrane by stretching will be investigated in order to attain the high performance and multi-functional micro- and nano-materials based on PP matrix. The project has been based on the current research and future development trend of PP transcrystallization. The fundamental investigation about the relationship among processing-structure-performance of PP films prepared by layer-multiplying coextrusion will be focused on the basic and key scientific issues. This research will offer a new meaningful idea and method to fabricate continues and orderly PP-transcrystallization, to deepen the fundamental understanding of the behavior of PP-transcrystallization, and to provide the novel theory in terms of high performance and multi-functional micro- and nano-materials based on PP matrix. We truly believe this research will be of great theoretical and practical significance.