中文摘要：

近年来，同轴静电纺丝技术广泛地用于制造各种多功能复合材料，同时聚合物受限结晶行为的研究倍受关注，许多方法被用来制备结晶性聚合物的受限空间。结合这两种研究背景，本文利用同轴静电纺丝技术，制备了聚丙烯腈（PAN）／聚氧化乙烯（PEO）和醋酸纤维素（CA）／PEO两种复合纤维，通过扫描电子显微镜和透射电子纤维镜对复合纤维形态结构分析，发现复合纤维具有皮芯结构，其中PEO作为芯层被包裹在外层PAN或CA中，同时改变静电纺丝时PEO溶液的浓度，复合纤维的直径和PEO芯层的直径也随之改变，从而为结晶性聚合物PEO提供了不同尺寸的受限空间。此外，对复合纤维膜进行了力学性能测试，结果发现CA／PEO复合纤维膜的拉伸性能要优于PAN／PEO复合纤维膜。

英文摘要：

Recently, the coaxial electrospinning are widely utilized to fabricate various multifunctional composite materials. Meanwhile, the confined crystallization of polymers takes much attention and many techniques are applied to prepare confinements for semi-crystalline polymers. Based on the two study backgrounds, in this paper, two kinds of polyacrylonitrile（PAN）/polyethylene oxide （PEO） and cellulose acetate （CA）/PEO composite fibers were fabricated by coaxial electrospinning. With the helps of scanning electron microscopy （SEM） and transmission electron microscopy （TEM）, the morphologies of the composite fibers were analyzed. It was found that the composite fibers were core-sheath structure, where the PEO as the core was embedded in the sheath PAN or CA. Tuning the concentration of PEO during electrospinning process, the diameter of the composite fibers and PEO core was changed, and therefore, different confinements were prepared for the semicrystalline PEO. Moreover, the mechanical properties of the composite fiber membranes were also tested. As a result, the tensile properties of CA/PEO composite fiber membranes were better than those of PAN/PEO composite fiber membranes.