Cure behavior of epoxy resin/montmorillonite/imidazole nanocomposite by dynamic torsional vibration method |
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Authors: | Xu Weibing He Pingsheng Chen Dazhu |
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Affiliation: | a Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China b Department of Polymer Science and Engineering, Hefei University of Technology, Hefei, Anhui 230026, China |
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Abstract: | Flory’s gelation theory, the non-equilibrium thermodynamic fluctuation theory and the Avrami equation have been used to predict the cure behavior of epoxy resin/organo-montmorillonite (Org-MMT)/imidazole intercalated nanocomposites at various temperatures and Org-MMT loadings. The theoretical prediction is in good agreement with the experimental results obtained by a dynamic torsional vibration method. The results show that the addition of Org-MMT reduces the gelation time tg and increases the rate of the curing reaction, the value of the kinetic constant k. The half-time t1/2 of cure after the gel point decreases with increasing of cure temperature, and the value of n is around 3 at lower temperature (<90 °C) and decreases to ∼2 as the temperature increases. The addition of Org-MMT has no obvious effect on the apparent activation energy of the cure reaction. There is no special curing process required for the formation of an epoxy resin/Org-MMT/imidazole intercalated nanocomposite. |
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Keywords: | Epoxy resin Montmorillonite Nanocomposite Cure Gel time Avrami equation |
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