热致液晶高分子微纤的形貌特征和一个模量分析的方法

MORPHOLOGICAL CHARACTERISTIC OF LIQUID CRYSTALLINE POLYMER FIBERS AND A STUDY ON ITS MODULUS

热致液晶高分子微纤的形貌特征和一个模量分析的方法益小苏，沈烈（浙江大学高分子科学与工程学系，杭州，３１００２７）关键词热致液晶高分子，原位复合，弹性模量，注塑由于主链型热致液晶高分子（ＬＣＰ）的高模量、高强度、易取向、低粘度等特性，当将这种高分子以较...

he morphological characteristic such as layer structure, layer thickness and the content as well as the aspect ratio of the in-situ formed liquid crystalline polymer fibers by injection molding was investigated and quantitatively measured. According to the inhomogeneous distribution of the fibers, a three-layer-model was set up. It's very difficult to determine the mechanical properties of the LCP fibers becausethey were in-situ formed and always embedded in the matrix. In this paper, amicromechanical model based on Cox model has been established to determine theYoung's modulus of the fibers. It has been shown that all the shear inducedin-situ fibers seem to have same Young's modulus as material related constant, independent upon the processing conditions, even though the different processing conditions result in significant change of the fiber content and the aspect ratio. Therefore, for in-situ formation of the LCP fibers, shear condition may only influencethe geometric structure, but not the mechanical characteristics.