结晶是高分子物理的基本问题之一。近年来，人们发现高分子材料在纳米尺度的环境中表现出特殊的结晶行为。阳极氧化铝模板（AAO）具有机械强度高、热稳定性高、尺寸均一可控等突出优点，可提供研究结晶问题的理想环境。目前国际上该方向的研究处于刚起步的阶段。本项目选取一系列不同分子量的单分散聚氧乙烯（PEO）为研究对象，拟在以下方面开展深入研究：（1）研究本体为伸直链晶体的低分子量PEO在直径小于其链伸直长度的AAO孔道中的分子链排列方式；（2）利用纵向声学模式Raman散射测定AAO中PEO片晶厚度，系统研究PEO片晶厚度同过冷度的依赖规律，同传统的结晶模型做对比；（3）综合考察PEO分子量、AAO孔道直径对成核、取向和片晶厚度的影响，建立受限空间中高分子结晶的模型。本项目立足高分子结晶学的基本物理问题，研究结果将加深对高分子结晶本质的理解，并为聚合物一维纳米材料的制备提供理论指导。

Crystallization is one of the basic areas in polymer physics. In recent years, it is found that polymer exhibits unique crystallization behavior in nanoscale geometries. One of the most ideal templates for confined crystallization research is anodic aluminum oxide template (AAO), which has high mechanical strength, high thermal stability, and uniform controllable pore-size. Currently, the crystallization behavior of polymer in nanopores is at the beginning stage. In the present project, monodisperse poly (ethylene oxide) (PEO) is chosen as the model polymer for the investigation of confined crystallization, and the following topics will be investigated: (1) The molecular chain packing mode of bulk extended chain crystal PEO in AAO with pore size smaller than the extended length of PEO chain; (2) Determination of lamellar thickness of PEO in AAO by longitudinal acoustic mode Raman scattering and systematic investigation of the dependence of PEO lamellar thickness on the degree of supercooling, and comparing it with traditional theories; (3) Study the effect of polymer molecular weight and pore size of AAO on the nucleation, orientation and lamellar thickness of PEO. And bulid a model for confined crystallization of polymers. The results of the current project can provide a better understanding on the nature of polymer crystallization, and may obtain a theoretical guidance for the preparation of one dimensional nanomaterials.