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

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@SiO 2 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@SiO 2) 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@SiO 2. DSC results confirmed that the value of activation energy decreased with the introduction of MWCNTs in the order of MWCNT@SiO 2 < r-MWCNTs < epoxy. It was found that the thermal conductivity of epoxy composites were significantly enhanced by incorporation of MWCNT@SiO 2, 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.
Authors:
 [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [3] ;  [3]
  1. Shanghai Univ. of Engineering Science, Shanghai (China)
  2. Shanghai Univ. of Engineering Science, Shanghai (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 28; Journal ID: ISSN 2046-2069
Publisher:
Royal Society of Chemistry
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Silica-coated multi-walled carbon nanotube; Epoxy composite; Curing behavior; Physical and mechanical properties
OSTI Identifier:
1378735

Li, Ao, Li, Weizhen, Ling, Yang, Gan, Wenjun, Brady, Michael A., and Wang, Cheng. Effects of silica-coated carbon nanotubes on the curing behavior and properties of epoxy composites. United States: N. p., Web. doi:10.1039/c5ra25182f.
Li, Ao, Li, Weizhen, Ling, Yang, Gan, Wenjun, Brady, Michael A., & Wang, Cheng. Effects of silica-coated carbon nanotubes on the curing behavior and properties of epoxy composites. United States. doi:10.1039/c5ra25182f.
Li, Ao, Li, Weizhen, Ling, Yang, Gan, Wenjun, Brady, Michael A., and Wang, Cheng. 2016. "Effects of silica-coated carbon nanotubes on the curing behavior and properties of epoxy composites". United States. doi:10.1039/c5ra25182f. https://www.osti.gov/servlets/purl/1378735.
@article{osti_1378735,
title = {Effects of silica-coated carbon nanotubes on the curing behavior and properties of epoxy composites},
author = {Li, Ao and Li, Weizhen and Ling, Yang and Gan, Wenjun and Brady, Michael A. and Wang, Cheng},
abstractNote = {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.},
doi = {10.1039/c5ra25182f},
journal = {RSC Advances},
number = 28,
volume = 6,
place = {United States},
year = {2016},
month = {2}
}

Works referenced in this record:

Small but strong: A review of the mechanical properties of carbon nanotube–polymer composites
journal, August 2006