124 / 2024-10-30 22:10:13

Investigation on the Enhanced Dielectric Properties of Graphene Oxide/Thiol-ene Composites

Graphene Oxide (GO),Off-Stoichiometric Thiol-Ene (OSTE),Interfacial Polarization,Dipole Polarization

The graphene oxide/off-stoichiometric thiol-ene (GO/OSTE) composites was prepared via a “click” chemical reaction. Experimental results from SEM, Raman, and XPS analyses demonstrated that GO can be well-incorporated into the OSTE matrix, with covalent crosslinking occurring between the surface functional groups of GO and the OSTE polymer. Thermogravimetric analysis (TGA) results indicated that the GO/OSTE composites exhibit excellent thermal stability below 350 °C. It was found that the dielectric constant, dielectric loss, and electrical conductivity of the GO/OSTE composites is strongly dependent on the GO content and frequency. The dielectric constant of the GO/OSTE composites increases with the increase of GO content, attributed to enhanced interface polarization effects and dipole polarization responses. When the mass fractions of GO is about 0.06 wt%, the measured dielectric constant of the composite material at 10³ Hz is about 23.6, approximately six times than that of the OSTE matrix. At 10⁷ Hz, the electrical conductivity also increases by about ten-fold, likely attributed to the hopping motion of charge carriers under high-frequency electric fields.