确定PTT/PET并列复合纤维卷曲结构的材料参数

通过实测3种不同横截面形状的PTT(聚对苯二甲酸丙二醇酯)/PET(聚对苯二甲酸乙二醇酯)自卷曲纤维的拉伸曲线和两组分在横截面中的面积分布,得到PTT和PET两组分材料的弹性模量比为0.333.由Denton的曲率计算模型推导得到3种特殊截面的自卷曲纤维的曲率表达式,结合实测的卷曲曲率,求得PTT和PET两组分的热收缩率差是在7%～10%之间.最后,用数值模拟方法考查了这3种横截面的自卷曲纤维的卷曲曲率随着两组分收缩率差、弹性模量比的变化关系,得到不同横截面形状及材料参数对PTT/PET自卷曲纤维卷曲曲率的影响.

Determining the Material Parameters of the Crimp Configuration of PTT/PET Side-by-Side Fibers

The elastic modulus ratio of PTT(polytrimethylene terephthalate)and PET(polyethylene terephthalate)components was 0.333 which was obtained by the stress-strain curve of three PTT/PET fibers with different cross-sectional shapes and the area distributions of two components in the cross sections of them.Crimp curvature expressions of the three fibers with special cross-sectional shapes based on the equation of Denton were developed with the measured data about crimp curvature to get the fractional differential shrinkage between PTT and PET components was in the range of 7%-10%.At last.relationships between crimp curvature of fibers and elastic modulus ratio and differential shrinkage ratio of two components were investigated by numerical analysis method.The effect of the cross-sectional shape and material parameters were discussed on the crimp curvature of PTT/PET self-crimping fibers.