新型架状硅酸盐改性聚酰胺6的拉伸流变性能及其应用

Extensional rheological properties of PA6 modified by novel framework silicate and its application

为了研究功能化改性聚酰胺6(PA6)纤维的可纺性与加工性能,以新型架状硅酸盐(QE粉)为改性剂对PA6进行共混改性,并以共混改性后的母粒与纯PA6为原料制备得到QE/PA6并列纤维,采用毛细管流变仪对QE/PA6共混物的拉伸流变性能进行研究,利用扫描电镜(SEM)、XL-2纱线强伸度仪对QE/PA6并列纤维的表面形态及力学性能进行表征。研究结果表明:QE/PA6共混熔体为拉伸变稀型流体,共混熔体的拉伸黏度和拉伸应力随着QE粉含量的增加而增大,当拉伸应变速率为421.14/s,QE粉质量分数为1 wt%、2 wt%和3 wt%时,复合材料拉伸黏度较纯PA6分别提高28.26%、46.74%和67.39%;共混熔体的拉伸黏度随温度的升高而下降,QE粉的引入提高了QE/PA6复合材料熔体的拉伸流动活化能,使得拉伸黏度对温度的敏感性提高;采用纺丝、牵伸一步法成功制得QE/PA6并列纤维,QE粉末在纤维表面分布均匀,与纯PA6并列纤维相比,QE/PA6并列纤维同样具有良好的强伸性能。

In order to study the spinnability and processability of functionalized modified polyamide 6(PA6) fibers, a novel framework silicate(QE powder) was used as the modifier to carry out blending modification of PA6. Besides, the QE/PA6 side-by-side fibers were prepared by using the modified masterbatch and pure PA6, and the extensional rheological properties of QE/PA6 blends were studied by capillary rheometer. The surface morphology and mechanical properties of QE/PA6 side-by-side fibers were characterized by scanning electron microscope(SEM) and XL-2 yarn strength tester. The results indicated that the QE/PA6 blend melts belong to extension thinning fluid, and the extensional viscosity and extensional stress of the blend melt increased with the increase of QE content. When the extensional stress rate was 421.14/s and the mass fraction of QE was 1 wt%, 2 wt% and 3 wt%, the extensional viscosity of composites increased by 28.26%、46.74% and 67.39%, respectively, compared with pure PA6. The extensional viscosity of blend melts decreased with the rise of temperature. The introduction of QE powder improved the extensional flow activation energy of QE/PA6 composite melt and the sensitivity of the extensional viscosity to temperature improved. The QE/PA6 side-by-side fibers were successfully prepared by one-step spinning and drawing method. The QE powder was evenly distributed on the fiber and the QE/PA6 side-by-side fiber also has good strength and extension performance, compared with pure PA6 side-by-side fibers.