Journal
JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY
Volume 57, Issue 11, Pages 778-790Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10601325.2020.1782228
Keywords
Sulfonic-functionalized graphene oxides; polyethersulfone nanocomposites; dielectric properties; EMI shielding; thermal properties
Categories
Funding
- Defence Research and Development Organization (DRDO) [ERIP/ER/1505006/M/01/1624]
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We have explored the sulfonic-functionalized graphene oxides (S-GOs) as an efficient conductive reinforcement to enhance the dielectric permittivity and electromagnetic interference (EMI) shielding effectiveness of the polyethersulfone (PES). The S-GOs having numerous terminal -SO(3)(-)groups not only promote the homogeneous dispersion for achieving the low percolation threshold, but also induce strong H-bonding and dipole-dipole interactions at the interfaces. As-prepared S-GO nanosheets showed uniform dispersion in PES matrix with strong adhesion with the polymer matrix via non-bonding interactions. The remarkable enhancement of dielectric permittivity of PES upon inclusion of S-GOs could be attributed to the interfacial polarization effect and microcapacitor model. As-prepared nanocomposites exhibited low conductive percolation threshold. The well-wrapped graphene nanosheets by thin PES layer prevented direct contact of graphene nanosheets and consequently decreased the dielectric loss by suppressing the current leakage. The PES/S-GO nanocomposites exhibited significant improvement in thermal stability with high char yield in N(2)atmosphere compared to pure PES. A high EMI shielding effectiveness of 23.5 dB was achieved for the nanocomposite film with 5 wt% graphene loading, which might be originated from the development of conductive network at higher graphene loading. Overall, the as-prepared PES/S-GO hybrid nanocomposite could be used in DC and radiofrequency electronics.
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