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采用PP-g-MAH与PA66进行共混改性,通过双螺杆挤出机制备改性尼龙66粒料,熔融纺丝后制备初生纤维。研究PP-g-MAH含量对共混物料流动性能,初生纤维热性能和拉伸性能的影响。研究结果表明,随着PP-g-MAH含量的增加,PA66/PP-g-MAH共混物样品的熔体流动速率逐渐减小,流动性变差;初生纤维的结晶度(Wc),熔点(Tm)和断裂强度先增大后减小。当PP-g-MAH含量为10%(质量分数,下同)时,结晶度,熔点和断裂强度达均达到最大值。其中结晶度为37.8%,熔点为263.87℃,断裂强度为4.31CN/dtex。
PP-g-MAH and PA66 were blended and modified. The modified nylon 66 pellets were prepared by twin-screw extruder and the nascent fibers were prepared by melt spinning. The effects of PP-g-MAH content on the flowability of the blends, the thermal properties and the tensile properties of the nascent fibers were investigated. The results showed that the melt flow rate of PA66 / PP-g-MAH blends decreased with the increase of PP-g-MAH content, and the fluidity became worse. The crystallinity (Wc), melting point (Tm) and fracture strength first increased and then decreased. When the PP-g-MAH content is 10% (mass fraction, the same below), the crystallinity, melting point and breaking strength reach the maximum. The crystallinity was 37.8%, the melting point was 263.87 ℃ and the breaking strength was 4.31CN / dtex.