【摘要】 商品涤纶长丝(76分号,24根,无捻)在1克拉力下于160、180、200、220、240、250和260℃进行2秒钟热处理,用小角X光散射和宽角X光衍射研究了各样品的结构,长周期和曲105衍射所得到的晶粒尺寸均随热处理温度T_α的升高而增大,I05衍射弧的方位扫描曲线用计算机进行分峰处理,所用拟合函数为两个高斯函数之和。随着T_α升高,I05弧的宽度下降,但其分离角增大,这说明晶区取向随T_α升高而改善。测定了样品的力学性能,发现纤维的强度与其体积结晶度(D/L)有密切关系.更多还原

【Abstract】 The heat treatment of commerical PET yarn (76 denier, 24 filaments and zero twist) was done for a short time at 160, 180, 200, 220, 240, 250 and 260℃ under low tension. The structure ef the samples has been studied by means of small-angle X-ray scattering and wide-angle X-ray diffraction. The long period and the crystallite size obtained from 105 diffraction increases with the increase in Ta, the heat treatment temperature. After a minimum at about 200℃, the amorphous length increases with Ta. X-ray azimuthal scans of the 105 arcs were resolved through a computer, which fits Gaussian function to the arc profiles, The width of the arc decreases, but the separation angle of 105 arcs increases with the increase in Ta. These assert that there is an increase of crystallite orientation with Ta. The mechanical properties of the samples were tested. The tenacity appeals to depend on the degree of crystallinity (=D/L).更多还原