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Effects of modified graphene on property optimization in thermal conductive composites based on PPS/PA6 blend

ABSTRACT In this study, reduced graphene oxide sheets (RGO) were previously modified by silane coupling when composited with Poly (phenylene sulfide) (PPS)/polyamide 6 (PA6) blends with a mass proportion of 4:6. Then the blends of RGO/PPS/PA6 were prepared under different mixing sequences, and it was found that the thermal conductivity of composite prepared by two-step blending showed enhanced values for immiscible blends compared with the one-step blending method at the same RGO loading. At the RGO loading of 4.06 wt%, the thermal conductivity of RGO/PPS/PA6 composite reached 0.74 W/(m·K) through the two-step blending method, which is 23.7% higher than that prepared by the one-step blending method. Moreover, great influences on the thermal conductivity and crystallization behavior of RGO were discussed. The thermal conductivity of RGO/PPS/PA6 composite with 36.36 wt% RGO reached 2.83 W/(m·K), which is 10.66 times higher than that of pure PPS/PA6 blend. Especially, based on DSC data, the introduction of PPS phase and RGO was proved to have little effect on the melting behavior of the composites, but a prominent heterogeneous nucleation effect and increased crystallization temperature were observed.