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Regulated Dielectric Loss of Polymer Composites from Coating Carbon Nanotubes with a Cross-Linked Silsesquioxane Shell through Free-Radical Polymerization

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journal contribution
posted on 12.11.2014, 00:00 by Da Sun, Zheng Zhou, Guang-Xin Chen, Qifang Li
We report a synthetic strategy for coating multiwalled carbon nanotubes (MWCNTs) with cross-linked octa-methacrylate-polyhedral oligomeric silsesquioxane (MA-POSS) by direct, in situ free-radical polymerization in a controlled manner. This strategy resulted in a core–shell structure with an MWCNT center. The shell thickness could be varied from ∼7 nm to 40 nm by choosing different initiators, solvents, and weight ratios of MWCNT and octa-MA-POSS. Coated MWCNT hybrids had controlled electrical performance depending on the coating layer thickness and were well-dispersed in the polymer matrix. POSS-coated MWCNTs were compounded with poly­(vinylidene fluoride) to obtain a composite with high dielectric permittivity and low dielectric loss.