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采用熔体浸渍包覆长玻璃纤维装置制备了长玻纤增强聚丙烯(PP/LFT)复合材料,通过双螺杆挤出机制备了同等配比的短玻纤增强聚丙烯(PP/SFT)复合材料。研究了增容剂含量、预浸料颗粒长度以及加工工艺对玻纤增强聚丙烯(PP/GF)复合材料力学性能的影响。结果表明:PP/LFT复合材料的力学性能明显优于PP/SFT复合材料,其拉伸强度及缺口冲击强度分别可达115.0 MPa和42.4 kJ/m~2;增容剂马来酸酐接枝聚丙烯(PP-g-MAH)的加入明显改善了GF与PP间的界面黏结强度,进一步提升了复合材料的力学性能,相比之下,增容剂对PP/SFT复合材料的性能提升效果更为明显;提高预浸料颗粒长度有利于复合材料纤维保留长度和力学性能的提升;适度提高加工温度,可进一步提高浸渍效果和复合材料的力学性能。
A long glass fiber reinforced polypropylene (PP / LFT) composite was prepared by melt impregnation and coating of long glass fiber. The PP / SFT composite with the same ratio was prepared by twin screw extruder material. The effects of compatibilizer content, prepreg particle length and processing technology on the mechanical properties of PP / GF composites were studied. The results show that the mechanical properties of PP / LFT composites are obviously better than those of PP / SFT composites. The tensile strength and notched impact strength of PP / LFT composites reach 115.0 MPa and 42.4 kJ / m ~ 2, respectively. The addition of propylene (PP-g-MAH) significantly improves the interfacial bond strength between GF and PP and further enhances the mechanical properties of the composites. In contrast, the effect of compatibilizer on PP / SFT composites is more improved Is obvious; improve prepreg particle length is conducive to the composite fiber retention length and mechanical properties; moderate increase processing temperature, can further improve the impregnation effect and the mechanical properties of composites.