Authors: Saeid NajafiShoa Hossein RoghaniMamaqani Mehdi SalamiKalajahi Reza Azimi Meysam GholipourMahmoudalilou
Publish Date: 2016/06/28
Volume: 51, Issue: 19, Pages: 9057-9073
Abstract
Thermal properties of epoxy resin E were improved by its incorporation into silica/siloxane network in the presence of carbon nanotube CNT At first CNT xerogel CNTX/E composite was prepared by curing E in the presence of CNTX Then E is modified with 3isocyanatopropyltriethoxysilane IE or tetraethyl orthosilicate TEOS oligomer TE for its incorporation into a hybrid network of CNTcontaining silica/siloxane network For this purpose a bifunctional modifier of 11′hexane16diylbis33trimethoxysilylpropylurea HDBTMSPU was synthesized CNTX was prepared by incorporation of HDBTMSPUmodified CNT FCNT into silica/siloxane network by using HDBTMSPU and TEOS IE TE FGO HDBTMSPU and TEOS were also used in the preparation of hybrid products Three types of composites were compared in their thermal degradation temperature and char content Functionalization of CNT was confirmed by Fourier transform infrared spectroscopy Xray photoelectron spectroscopy Raman Xray diffraction XRD and thermogravimetric analysis TGA results Xerogel formation was proved by Raman XRD and N2 adsorption and desorption isotherms TGA results showed that the hybrid of IE FCNT and silica/siloxane network shows higher thermal properties Char residue is increased 1754 by only 4 wt loading of FCNT in IE resin IEGX1 Formation of xerogel network around CNT was observed by scanning and transmission electron microscopies
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