纤维对微发泡聚丙烯复合材料发泡行为的影响

Effects of the Fiber on the Foaming Behavior of Micro-Foamed PP/Fiber Composites

采用化学发泡法注塑成型工艺制备了微发泡聚丙烯(PP)/纤维复合材料,通过流变理论和纤维与树脂的界面行为,研究了玻璃纤维(GF)、芳纶纤维(AF)和碳纤维(CF)对微发泡聚丙烯复合材料发泡行为的影响。结果表明,纤维的加入可以有效改善微发泡PP材料的泡孔结构,改善效果CF>GF>AF,这归因于纤维的成核能力和PP/纤维复合材料流变性能的综合作用;比表面积越大、长度越短和分散性越好的纤维可以提供更多的成核点位置,从而可以获得具有较小泡孔尺寸和较大泡孔密度的微发泡材料。

The micro-foamed PP composites were prepared by chemically foaming method in a injection molding machine. The effects of aramid fiber（ AF）,glass fiber（ GF） and carbon fiber（ CF） on the foaming behavior of microfoamed PP composites were investigated by the rheology theory and interface behavior between fiber and resin. The results show that short fibers can effectively improve the cell structure of foamed PP materials,and CF 〉GF 〉AF. This is attributed to the nucleation of short fibers and the rheological property of PP / fiber composites; the shorter fibers with higher specific surface area and good dispersion can provide more nucleation sites,and its micro-foamed materials have a smaller cell size and a larger cell density.