Graphene oxide as a Pickering emulsifier for poly(glycidyl methacrylate) composite particles and their suspension rheology under applied electric fields

초록

Electro-responsive smart poly(glycidyl methacrylate) (PGMA)/graphene oxide (GO) composite particles were synthesized using Pickering emulsion polymerization, in which the GO sheets simultaneously performed two roles, as a shell in a core-shell structure and a solid Pickering emulsifier. While the morphology of the synthesized PGMA/GO particles was examined via both transmission electron microscopy and high-resolution scanning electron microscopy, their chemical structural bonding and thermal stability were examined using Fourier transform infrared spectroscopy and thermo gravimetric analysis, respectively. The electrorheological (ER) features of PGMA/GO particle-based ER fluids dispersed in a silicone oil were studied by a rotational rheometer with various electric fields supplied by a high-voltage power generator. The experimental flow curve of the shear stress fitted well with the Bingham fluid model. To obtain additional information about the relationship between their ER behaviors and dielectric properties, the dielectric spectra were examined using a LCR meter and found to fit well with the Cole-Cole equation.

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