Study on dispersion of reduced graphene oxide on physical performance of Polyvinylidene fluoride composites by Hansen solubility parameters
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Poor dispersion of graphene in solvents and polymers remains a critical obstacle in practical application of poly(vinylidene fluoride) (PVDF) composite which loading graphene as filler. In order to inhibit the aggregation of reduced graphene oxide (RGO), two dispersants, polyimide (PI) and polyaniline (PANI), were used to modify RGO via in situ polymerization. The functionalization of reduced graphene oxide was characterized by Fourier transform infrared (FT-IR) and X-ray diffraction (XRD). Hansen solubility parameters (HSPs) theory was an effective way to investigate the compatibility of reduced graphene oxide in various solvents and polymers. Light optical microscope was employed to evaluate actual dispersion of functionalized RGO within the PVDF matrix. From the practical consideration, the dielectric and dynamic mechanical properties of PVDF and the composites were tested by dielectric impedance spectrometer and dynamic mechanical analysis (DMA), which illustrated the dispersion of reduced graphene oxide in poly(vinylidene fluoride) was closely related to physical performance of composites.
KeywordsReduced graphene oxide Functionalization Dispersion Hansen solubility parameters Dielectric properties
This work was financially supported by a grant from “Research Project Supported by Shanxi Scholarship Council of China” (Grant No. 2015-035) and National Natural Science Foundation of China (Grant No. U1607120, U1710117, U1610255).
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Conflicts of interest
The authors declare that they have no conflict of interest.
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