PP/PET共混体系及其合金纤维的研究

Study of the PP/PET Blends and PP/PET Alloy Fibers

用增容剂PP-g-AA增容PP/PET共混体系。研究了增容剂含量、共混物组成、共混时间、共混温度以及螺杆转速对PP/PET相形态的影响。结果表明:增容剂的加入大大改善了PP/PET两相间的相容性,并且增容剂的添加量有一最佳值,为PET质量的50%。随着PET含量的增加,分散相的尺寸有所增加。共混温度和共混时间均有一最佳值。随着螺杆转速的提高,分散相的尺寸减小,分布趋于均一,相容性也得到改善。另外,还制备了PP/PET合金纤维,对其表面处理后以及断面SEM观察均表明分散相PET原位成纤,这些微纤提高了合金纤维的力学性能。测试了合金纤维的力学性能,发现组分比为90/10/5时,合金纤维具有最好的力学性能。

PP-g-AA worked as the compatibilizer for the blends of PP/PET in this paper. The effects of different amounts of comparibilizer, different components, mixing rime, temperature, and shear rates on the blend morphology such as size and size distribution of island component were studied. The SEM pictures showed that the comparibilizer of PP-g-AA remarkably improved the compatibility of PP/PET blends and the best amount of the compatibilizer was 50 % of PET by weight. The dispersion phases increased with the increasing of PP amounts. With the advancement of shear rate, the size of dispersion phases decreased, the distribution tended to uniformity and the compatibility was also improved. PP/PET composite fibers were prepared and the SEM of fiberss surface after saturated in the alkaline solution and fiber＇s fracture surface showed that in-situ microfiber of PET dispersion phase was formed. It was predicted that the formarion of in-situ microfiber would improve the mechanical properties of fibers. The mechanical properties of fibers were tested. The results showed that composite fiber with PP/PET/PP-g-AA of 90/10/5 had good mechanical properties.