Abstract:

The short glass fiber (SGF)/polypropylene (PP) foam composites toughened by maleic anhydride grafted ethylene-1-octene copolymer (EOC-g-MAH) were prepared via post-foaming process in designed dies.The influence of EOC-g-MAH content on the cellular morphology, microstructure and mechanical properties of composites were investigated.The results indicated that the outstanding improvement in foaming effect was realized by the addition of EOC-g-MAH with a 35% reduction for average cell size and nearly four-fold increase in cell density.The interfacial adhesion between SGF and matrix was enhanced.More importantly, a novel morphology of EOC-g-MAH particles adhered to the surface of SGF was observed.The impact toughness of the SGF/PP foam composites was improved significantly and the peak value with a 77% increase was obtained when the mass fraction of EOC-g-MAH was added up to 8%.The flexural strength of SGF/PP foam composites was increased first and then decreased. However, the compressive strength exhibited an almost linear decline with the increase of the EOC-g-MAH.

Key words:

聚丙烯, 泡沫复合材料, 增韧, 界面结合

摘要：

采用型内二次发泡工艺制备了马来酸酐接枝乙烯-1-辛烯共聚物(EOC-g-MAH)共混增韧短玻璃纤维(SGF)/聚丙烯(PP)泡沫复合材料，考察了EOC-g-MAH含量对复合材料的泡孔形貌、微观结构和力学性能的影响。结果表明，EOC-g-MAH的引入改善了泡沫体的发泡效果，平均孔径减小约35%，泡孔密度提高近4倍且分布均匀。SGF与基体间的界面结合得到显著增强，且EOC-g-MAH在SGF表面形成了颗粒黏附结构，大幅提高了SGF/PP泡沫复合材料的冲击韧度，并在质量分数为8%时达到最大值，增幅为77%。随着EOC-g-MAH质量分数的增加，SGF/PP泡沫复合材料的抗弯强度先增加后降低，而压缩强度则呈近似线性下降的变化趋势。

关键词:

聚丙烯, 泡沫复合材料, 增韧, 界面结合