注塑成型长玻璃纤维/聚丙烯复合材料的冲击韧性

IMPACT TOUGHNESS OF LONG GLASS FIBER REINFORCED POLYPROPYLENE

利用自行研制的连续纤维 /热塑性树脂浸渍装置 ,制备了注塑成型用长玻璃纤维增强聚丙烯粒料。利用Charpy冲击试验 ,研究了界面相容剂 (接枝马来酸酐聚丙烯 )的用量、粒料长度等对注塑试样冲击韧性的影响。试验发现 ,随着接枝聚丙烯含量的增加 ,试样的冲击韧性显著提高。但当接枝聚丙烯含量达到一定程度时 ,冲击韧性反而下降。注塑试样的冲击韧性随长纤维粒料的长度增加和冲击试样模具的浇口尺寸变大而升高。对于平板材料 ,冲击试样所处的位置不同 ,其韧性也有较大的变化。试验还发现 。

By using an impregnation device developed at our laboratory, long glass fiber reinforced polypropylene pellets for injection molding were produced. Composites samples were molded with the pellets by a conventional injection machine. Factors affecting the impact toughness were studied by Charpy test. The impact toughness increased with the addition of grafted polypropylene at first, but it decreased slowly when the grafted polypropylene addition exceeded 5%. Nevertheless, a higher impact toughness was obtained with longer pellets and/or wider runner. As to molded planar samples, the impact toughness variation is dependent on the position where the sample was cut. Annealing was an effective method to improve the impact toughness.