화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.54, 184-189, October, 2017
Chemical effects of organo-silanized SiO2 nanofillers on epoxy adhesives
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Although thermal and mechanical effects of organo-silanized SiO2 nanofillers (NFs) incorporated into epoxy resins have been actively studied by many researchers, their chemical properties have rarely been reported. In this work, we investigated the chemical effects of organo-silanized SiO2 NFs on epoxy adhesives with (3-glycidoxypropyl) methyldiethoxysilane (GPTMS) and (3-aminopropyl) trimethox- ysilane (APTMS)-functionalized SiO2 NFs. After curing epoxy-functionalized NF (EPOXY-NF) with triethylenetetramine (TETA) hardener, we were able to verify chemical crosslinking of the TETA hardener on EPOXY-NF with X-ray photoelectron spectroscopy, vacuum Fourier-transform infrared spectroscopy, and zeta potential analysis. Similarly, we found that after curing amine-functionalized NF (NH2-NF) with bisphenol A diglycidyl ether (DGEBA) epoxy resin, the resin was chemically crosslinked on NH2-NF as well. Finally, when we evaluated adhesion properties of adhesives composed of DGEBA resin/NH2-NF and TETA hardener/EPOXY-NF on the basis of ASTM D3163, we observed improvements in the shear strength of 79 and 49%, respectively, in comparison with bare SiO2 NF. This suggests that the chemical effects of organo-silanized SiO2 NFs indeed contribute to the adhesion properties of adhesives.
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