无机粉体对微发泡聚丙烯复合材料力学行为的影响

Effect of Inorganic Powder on Mechanical Behavior in Microcellular Foam PP

通过改性的不同形状(针状MgSO4晶须、片状云母粉、球形状SiO2)无机粉体材料,以5%含量加入到聚丙烯中,在二次开模条件下制备微发泡PP复合材料;测定PP/无机粉体材料复合体系接触角,联合粘接理论计算液-固界面的黏附功;以异相成核理论和填充增强机理为基础,分析了不同形状的无机粉体材料对微发泡PP材料力学行为的影响规律。结果表明:PP/云母粉复合体系发泡后冲击强度提高比例达到79%,弯曲强度和拉伸强度比纯PP未发泡材料的强度还高,但比相应未发泡PP复合体系有所降低。这充分说明了在材料成本降低基础上综合性能得到提高;片状云母粉是微发泡PP复合材料的理想填料。

Modified inorganic powder materials（one-dimensional MgSO4 whisker, two-dimensional Mica and three-dimensional SiO2） was added into polypropylene with 5% content. The microcellular foam PP composite was made under the condition of twice-open mold. According to the principle of interfacial adhesion, Liquid-solid interface PP composite system was calculated adhesion work by measurements of the contact angle. Taking heterogeneous nucleation theory and reinforcement effect, mechanical behavior of microcellular foam PP composite was analyzed by inorganic powder material, The results showed that PP/Mica composite system showed the maximum impact strength, which is improved by 79.17%. It is not only to reduce cost and but also to effects enhance. So Mica powder is the best two dimension filler on enhancement in foamed PP composites.