芳纶纤维对化学发泡聚丙烯泡孔演化过程的影响

Effects of Aramid Fiber on Chemical Foaming Process of Polypropylene

采用可视化装置观察芳纶纤维(AF)填充聚丙烯(PP)化学发泡过程,系统地研究了AF含量及纤维改性对化学发泡PP发泡行为的影响。结果表明:在PP发泡过程中,泡孔的不规整度随AF含量的增加而增大,并且泡孔的生长均受到AF的限制,导致泡孔发生形变,同时表现出明显的沿着平行于AF的方向生长的规律;经表面改性的AF能有效抑制泡孔沿纤维表面的迁移生长,在进入泡孔的过程中,泡孔呈现出先变形后恢复的规律。

The effects of the different content of aramid fiber（AF） and fiber modification on chemical foaming process of polypropylene（PP） were investigated by the visualization system. The results show that the bubbles in the foaming process of PP irregular degree increase with the increase of AF content. The growth of the bubble is limited to AF, resulting in deformation of the bubble, and the growth direction of the bubble is along parallel to the AF obviously. The modified AF can effectively inhibit the migration and growth of the bubble along the fiber surface. The bubbles present deformation and then recovery when the modified AF bore into the bubble in the foaming process.