Preparation And Thermoelectric Properties Of Graphene / Polyphenylene Sulfide Composites

Poly(p-phenylene sulfide) (PPS) is a kind of engineering plastic with the highest cost performance. Its excellent properties such as high temperature resistance, corrosion resistance had found application in aerospace and electronics. There exist drawbacks that limit its application, such as low electric conductivity and thermal conductivity. Our work introduced functionalized GO as nano fillers to fabricate PPS-based composites and discussed the influence on the properties, such as crystallization behaviour, electrical conductivity and thermal conductivity of PPS. The main contents are as follows:Firstly, Na2S was introduced to prepare reduced GO (referred as RGO-Na2S), which was compared with the reduction process using N2H4 as reducing agent. FT-IR, XRD, XPS, Raman spectra, SEM and HRTEM characterization indicated a better reduction process by Na2S, during which the structural defects were restored. TG-MS was used to deduce the reduction mechanism.Secondly, two kinds of functionalized GO were prepared, namely hexadecylpyridinium bromide functionalized GO and CNTs/TiO2 modified GO. The chemical structure of composites was systemtically characterized.Thirdly, RGO-Na2S was introduced as nanofillers to prepare PPS-based composites by using the melt blending method. The dispersion was studied by analysis of HRTEM. On basis of that, the effect of the compatibility of RGO-Na2S and PPS on the properties of PPS was investigated. It was concluded that the optimal filler content is 0.5%, apparentely enhancing the thermal stability, crystallization behavior and conductivity. In addition, the filler dispersion was investigated with different contents of RGO-Na2S.Lastly, Py-C16-GO and TiO2-CNTs-GO was introduced as nano fillers to prepare PPS-based composites (5%) by using the solution blending method. The characterization results indicated the good dispersion of nano fillers in PPS, which enhanced the thermal stability, crystallization behavior and higher conductivity of PPS. A filler content of 5%increased the electrical conductivity to 4.32×10-5 S/m and 6.53 ×10-5 S/m, respectively. At the same time, the thermal conductivity increased to 0.1793 W/m·K and 0.1393 W/m·K, respectively.