PP-g-MAH预浸渍玻璃纤维毡对GMT界面改性的作用

采用含有马来酸酐接枝聚丙烯(PP–g–MAH,简称MPP)的聚丙烯(PP)树脂对玻璃纤维(GF)毡预浸渍,进行增强体改性,通过直接浸渍工艺、增强体预浸渍工艺、累加浸渍工艺等不同工艺制备GF毡增强PP热塑性复合材料(GMT)。对不同工艺制备的GMT界面形态进行了扫描电子显微镜分析,并测定了预浸渍处理后GF的疏水性,研究了预浸渍工艺中MPP的用量对GMT拉伸、弯曲、冲击等力学性能的影响。结果表明:采用含MPP的PP树脂进行增强体预浸渍改性的方法,改性树脂对GF的包覆效果良好,经预浸渍改性法处理的GF,其疏水性增强;并可以获得与PP/MPP改性树脂直接浸渍GF毡时相似的界面改性效果和相近的GMT力学性能;样品界面改性效果相近的情况下,增强体预浸渍改性方法所需的MPP用量明显少于改性树脂直接浸渍时的用量。

Effect of PP-g-MAH Pre-impregnate Glass Fiber-mat on Interfacial Modiifcation of GMT

The glass fiber-mat reinforcement was modified by pre-impregnating using polypropylene (PP) resin containing maleic anhydride grafted polypropylene (PP–g–MAH,MPP for short), the glass fiber-mat reinforced thermoplastic composites (GMT) were produced according to direct-impregnating (d-GMT), pre-impregnating (p-GMT) and multi-impregnating (pm-GMT) technology respectively. The interfacial morphology of GMT prepared by different technology were investigated by scanning electron microscope. The hydrophobic property of pre-impregnated glass fiber was also revealed. The effect of MPP content in pre-impregnation technology on mechanical properties of GMT was studied by testing the tensile,flexural and impact properties. The rusults show that the GMT prepared by MPP/PP pre-impregnated glass fiber-mat (p-GMT) share the similar mechanical properties and interfacial morphology to the GMT whose MPP/PP resin is the whole matrix. However,the dosage of MPP of p-GMT is much smaller than that of the later one.