β成核剂和PET纤维对PP力学性能的影响

Effcet of β-Nucleating Agent and PET Fiber on Mechanical Properties of PP

为提升聚丙烯(PP)韧性同时保持较大的刚性,以PP为基体,通过添加β-成核剂、PET纤维以及PP-gMAH制备复合材料,并研究复合材料的晶型结构及力学性能。结果表明:PP主要形成α-晶,加入β-成核剂则主要形成β-晶,且具有较大的冲击强度。加入PET纤维,可提高PP和β-PP的拉伸性能,随着PET纤维的增加,复合材料的拉伸强度逐渐提高,但冲击强度和断裂伸长率明显下降。相对而言,β-PP复合材料的冲击强度是PP复合材料的2倍,同时能保持较大的拉伸强度和弹性模量。经PP-g-MAH增容,可同时提高PP和β-PP复合材料的拉伸强度和冲击强度。因此,可在PP中添加β-成核、PET纤维和PP-g-MAH制备高强高韧的复合材料。

To enhance the toughness of polypropylene （PP） while maintaining great rigidity, β-nucleating agents, PET fiber and PP-g-MAH were simultaneously added into PP, and the crystal structure and mechanical performance of composite were studied. The results showed that,PP mainly formed into α-crystal,while into g-crystal after adding β-nucleating agents, which had greater impact strength. PET fiber improved the tensile strength and modulus of PP and β-PP, and they gradually improved with PET fiber,while the impact strength decreased. Comparatively speaking,the impact strength of β-PP composites was 2 times higher than that of PP composites while had high tensile strength and elastic modulus. Interestingly,the tensile and impact strength of PP and β-PP composites could be simultaneously improved by the compatibilizer PP-g-MAH. Thus,the PP composites with high strength and high toughness could be prepared by adding g-nucleation, PET fiber and PP-g-MAH into PP.