Regulated dielectric loss of polymer composites from coating carbon nanotubes with a cross-linked silsesquioxane shell through free-radical polymerization

Da Sun; Zheng Zhou; Guang-Xin Chen; Qifang Li

doi:10.1021/am503633t

Regulated dielectric loss of polymer composites from coating carbon nanotubes with a cross-linked silsesquioxane shell through free-radical polymerization

ACS Appl Mater Interfaces. 2014 Nov 12;6(21):18635-43. doi: 10.1021/am503633t. Epub 2014 Nov 3.

Authors

Da Sun¹, Zheng Zhou, Guang-Xin Chen, Qifang Li

Affiliation

¹ Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education and ‡College of Material Science and Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.

PMID: 25337905
DOI: 10.1021/am503633t

Abstract

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.

Keywords: carbon nanotubes; composites; dielectric loss; free-radical polymerization.

Publication types

Research Support, Non-U.S. Gov't