共混顺序对石墨烯微片在PP/PA6/SEBS共混物中的选择性分布和迁移的影响

研究了聚丙烯(PP)/聚酰胺6(PA6)/氢化苯乙烯-丁二烯嵌段共聚物(SEBS)/石墨烯微片(GNPs)纳米复合材料在不同共混顺序下的微观形貌、导电及导热性能,分析了GNPs在复合体系中的选择性分布和迁移及其对复合材料性能的影响.结果表明,在PP/PA6/SEBS/GNPs共混体系中,GNPs在界面张力的作用下趋向于...

Effect of Blending Sequence on Selective Distribution and Migration of Graphene Nanoplatelets in PP/PA6/SEBS Blends

In this work,the morphology,and electrical and thermal conductivities of polypropylene(PP)/polyamide 6(PA6)/styrene-ethylene-butylene-styrene copolymer(SEBS)/graphene nanoplatelets(GNPs)nanocomposites were investigated in terms of different blending sequences.The selective distribution and migration of GNPs in the matrix and their effects on the properties of nanocomposites were analyzed.The results indicated that in PP/PA6/SEBS/GNPs blending system,GNPs were more easily distributed in the PA6 phrase during the melt mixing process regulated by thermodynamic factors.When GNPs were added into PP at first and then blended with PA6,GNPs migrated from the PP phrase to the interface of cocontinuous PP/PA6 blending domain.This facilitated the construction of thermal conductive paths at the blend interface,resulting in an enhancement in thermal conductivity of the nanocomposites.As a result,the nanocomposites achieved a thermal conductivity of 0.83 W/(m·K)with the addition of 7 wt% GNPs.Moreover,the addition of SEBS improved the interfacial compatibility between the PP and PA6 phrases and therefore eliminated the surface gaps between the two phrases.