将助剂预混与二次挤出工艺相结合制备含短纤维预发泡粒料,并用型内二次发泡工艺制备了短炭纤维(SCF)、短玻璃纤维(SGF)混杂增强聚丙烯(PP)复合泡沫材料.研究了在纤维总质量分数不变时,SCF与SGF的相对含量、增强纤维与PP的界面性能及泡沫体的表观密度对PP复合泡沫材料的发泡效果和力学性能的影响.结果表明:SGF和SCF的同时加入能够改善PP的高温熔体强度,获得孔径较小且均一的类球形的闭孔PP泡沫体.SGF和SCF混杂增强提高了PP复合泡沫材料的强度和模量,且增强效果高于单一纤维,当纤维总质量分数为15%,且SGF:SCF为1:1时(质量比),PP复合泡沫材料的抗弯强度和抗压强度最高,而SGF:SCF为3:1时,PP泡沫复合材料的冲击韧性和压缩模量达到最大值.泡沫体的表观密度对PP复合泡沫材料的冲击韧性和抗压强度影响显著,当表观密度从0.32 g/cm3增至0.45 g/cm3时,冲击韧性和抗压强度分别从4.29 kJ/m2和6.57 MPa提高到17.87 kJ/m2和20.57 MPa.
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