Effects of silica-coated carbon nanotubes on the curing behavior and properties of epoxy composites

Li, Ao; Li, Weizhen; Ling, Yang; Gan, Wenjun; Brady, Michael A.; Wang, Cheng

doi:10.1039/c5ra25182f

Title: Effects of silica-coated carbon nanotubes on the curing behavior and properties of epoxy composites

Journal Article · Mon Feb 22 00:00:00 EST 2016 · RSC Advances

DOI:https://doi.org/10.1039/c5ra25182f· OSTI ID:1378735

Li, Ao ^[1]; Li, Weizhen ^[1]; Ling, Yang ^[1];

^[2]; Brady, Michael A. ^[3]; Wang, Cheng ^[3]

Shanghai Univ. of Engineering Science, Shanghai (China)
Shanghai Univ. of Engineering Science, Shanghai (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Multi-walled carbon nanotubes (MWCNTs) were coated with silica by a sol–gel method to improve interfacial bonding and dispersion of nanotubes in the diglycidyl ether of bisphenol A (DGEBA) matrix. TEM and FE-SEM measurements showed that the silica shell was successfully coated on the surface of r-MWCNTs (as-received MWCNTs), and that the dispersion of MWCNT@SiO₂ in the epoxy matrix and interfacial adhesion between MWCNTs and epoxy were improved through the silica shell formation. The effects of silica-coated multi-walled carbon nanotube (MWCNT@SiO₂) addition on the curing behavior of epoxy resin, and on the physical and thermomechanical properties of epoxy composites, were studied. FT-IR measurements of different blends at different curing times indicated that the curing reaction was accelerated with the presence of MWCNTs and increased with the content of MWCNT@SiO₂. DSC results confirmed that the value of activation energy decreased with the introduction of MWCNTs in the order of MWCNT@SiO₂ < r-MWCNTs < epoxy. It was found that the thermal conductivity of epoxy composites were significantly enhanced by incorporation of MWCNT@SiO₂, relative to composites with r-MWCNTs, while the values of the glass transition temperature slightly increased, and the high electrical resistivity of these composites was retained overall.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1378735

Journal Information:: RSC Advances, Vol. 6, Issue 28; ISSN 2046-2069

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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