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Materials 2015, 8(10), 7032-7040; doi:10.3390/ma8105357

Characterization and Curing Kinetics of Epoxy/Silica Nano-Hybrids

1
Department of Chemical and Materials Engineering, National University of Kaohsiung, No. 700, Kaohsiung University Rd., Nan-Tzu Dist., Kaohsiung 811, Taiwan
2
Department of Applied Chemistry and Materials Science, Fooyin University, 151 Jinxue Rd., Daliao Dist., Kaohsiung 831, Taiwan
3
Department of Electrical Engineering, National University of Kaohsiung, No. 700, Kaohsiung University Rd., Nan-Tzu Dist., Kaohsiung 811, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Teen-Hang Meen
Received: 31 August 2015 / Revised: 2 October 2015 / Accepted: 10 October 2015 / Published: 16 October 2015
(This article belongs to the Special Issue Selected Papers from ICASI 2015)
View Full-Text   |   Download PDF [2563 KB, uploaded 16 October 2015]   |  

Abstract

The sol-gel technique was used to prepare epoxy/silica nano-hybrids. The thermal characteristics, curing kinetics and structure of epoxy/silica nano-hybrids were studied using differential scanning calorimetry (DSC), 29Si nuclear magnetic resonance (NMR) and transmission electron microscopy (TEM). To improve the compatibility between the organic and inorganic phases, a coupling agent was used to modify the diglycidyl ether of bisphenol A (DGEBA) epoxy. The sol-gel technique enables the silica to be successfully incorporated into the network of the hybrids, increasing the thermal stability and improving the mechanical properties of the prepared epoxy/silica nano-hybrids. An autocatalytic mechanism of the epoxy/SiO2 nanocomposites was observed. The low reaction rate of epoxy in the nanocomposites is caused by the steric hindrance in the network of hybrids that arises from the consuming of epoxide group in the network of hybrids by the silica. In the nanocomposites, the nano-scale silica particles had an average size of approximately 35 nm, and the particles were well dispersed in the epoxy matrix, according to the TEM images. View Full-Text
Keywords: sol-gel technique; nanocomposite; differential scanning calorimetry (DSC); autocatalytic mechanism sol-gel technique; nanocomposite; differential scanning calorimetry (DSC); autocatalytic mechanism
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MDPI and ACS Style

Yang, C.-F.; Wang, L.-F.; Wu, S.-M.; Su, C.-C. Characterization and Curing Kinetics of Epoxy/Silica Nano-Hybrids. Materials 2015, 8, 7032-7040.

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