Cure behavior of epoxy/MWCNT nanocomposites: The effect of nanotube surface modification
作者： Mohamed Abdalla , Derrick Dean , Pamela Robinson , Elijah Nyairo
DOI: 10.1016/J.POLYMER.2008.05.016
关键词:
摘要: Abstract The effect of carboxyl and fluorine modified multi-wall carbon nanotubes (MWCNTs) on the curing behavior diglycidyl ether bisphenol A (DGEBA) epoxy resin was studied using differential scanning calorimetry (DSC), rheology infrared spectroscopy (IR). Activation energy ( E a ) rate constants k obtained from isothermal DSC were same for neat fluorinated MWCNT system (47.7 and 47.5 kJ/mol, respectively) whereas samples containing carboxylated MWCNTs exhibited higher activation (61.7 kJ/mol) lower constant. Comparison energies, constants, gelation vitrification times all suggests that cure mechanisms sample are similar but different sample. This can be explained by difference in how react with compared to nanotubes. Although two systems have reaction mechanisms, both degrees conversion as calculated spectroscopic data, glass transition temperature T g ), predictions based data. mechanism may attributed differences nanotube dispersion; is more uniformly dispersed matrix heterogeneously hinder mobility reactive species disrupt stoichiometry local scale.
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