高收缩聚丙烯纤维研究 Ⅰ.纤维热收缩机理

运用Ｘ－光衍射仪、偏光显微镜及其复合测试技术，对高收缩聚丙烯纤维热处理前后超分子结构变化和纤维热收缩机理进行了研究，结果表明：高收缩聚丙烯纤维必须具有大量高取向非晶区，少量结晶区，结晶度低，晶粒尺寸小，近晶型晶胞。纤维热收缩机理是在热处理过程中，高取向的非晶区发生了大量解取向，同时伴随着结晶晶型从近晶向α晶转变，结晶度大幅度提高，晶粒尺寸成倍增长。

HIGH SHRINKING PP FIBERⅠ.THERMAL SHRINKING MECHANISM

he thermal shrinking mechanism of high shrinking PP fiber and change of the super molecular structure in the shrinking process was studied by means of wide angle X ray diffraction and micropolariscope. The results show that there is the super molecular structure of a few percentage of crystal region, small crystalline size, smectic crystal type and a large percentage of high oriented amorphous region. The thermal shrinking mechanism of high shrinking PP fiber was that the disorientation in the amorphous region happened violently in dry heat process, meanwhile, accompanying with the crystal transformation from the smectic crystal type to α crystal type, the great increase for crystallinity, the quick growth for crystalline size, which results in high shrinking behaviour of high shrinking PP fiber.