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.

摘要

在这项研究中，当与聚苯硫醚 (PPS)/聚酰胺 6 (PA6) 共混物以 4:6 的质量比例复合时，还原氧化石墨烯片 (RGO) 之前通过硅烷偶联进行了改性。然后在不同的混合顺序下制备了 RGO/PPS/PA6 的共混物，发现两步共混制备的复合材料的热导率在相同的 RGO 下与一步共混方法相比显示出更高的值加载。在 RGO 负载量为 4.06 wt% 时，通过两步共混法制备的 RGO/PPS/PA6 复合材料的热导率达到 0.74 W/(m·K)，比一步共混制备的热导率高 23.7%方法。此外，还讨论了对 RGO 的热导率和结晶行为的重大影响。含有36.36 wt% RGO的RGO/PPS/PA6复合材料的热导率达到2.83 W/(m·K)，是纯PPS/PA6共混物的10.66倍。特别是，基于 DSC 数据，证明 PPS 相和 RGO 的引入对复合材料的熔融行为几乎没有影响，但观察到显着的异相成核效应和结晶温度升高。