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Cure Behavior of Epoxy-Cyanate Ester Blend in Composite Systems: Evaluation Studies in Neat Resin Cast by Thermal and FTIR Techniques

Sekhar, Ravi K and Kishore, * and Sankaran, S (2008) Cure Behavior of Epoxy-Cyanate Ester Blend in Composite Systems: Evaluation Studies in Neat Resin Cast by Thermal and FTIR Techniques. In: Journal of Applied Polymer Science, 109 (3). pp. 2023-2028.

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Abstract

The post-cure behavior of a commercially available DGEBA-based epoxy modified cyanate ester resin (1,1-bis (4-cyanato phenyl) ethane) was investigated by thermo analytical techniques and Fourier Transform Infrared (FTIR) spectroscopy. Thermally initiated resin cure was carried out at $170^o C/1 h$ followed by $180^o C/2 h$. Two different post-cure procedures, (PCPs), PCP-I $(210^o C/2 h + 250^o C/1 h)$ and PCP-II $(280^o C/3 h)$, were independently followed for the cured resin material. Dynamic mechanical analysis (DMA) characterization of the resin casts indicated significant lowering of glass transition temperature $(T_g)$, by about $35^o C$ in PCP-II casts in comparison with PCP-I, though the former was post cured at higher temperature. However, the PCP-II specimens recorded considerable enhancement in storage modulus values at room temperature and above till about the $T_g$ region. FTIR spectroscopic studies of the resin cast support the formation of both cyanurate triazine ring $(1563 cm^{-1}$, $1368 cm^{-1})$ and oxazolidinone ring $(1736 cm^{-1})$ for the PCP-I resin cast while in the PCP-II specimens the former, namely the cyanurate formation was found to be absent. The absence of rigid cyanurate triazine rings in PCP-II was further strengthened by the $tan \delta_{max}$ values observed in these resin casts by DMA. The DMA and differential scanning calorimetry gave comparable $T_g$ values for both the PCP-I and PCP-II resin casts.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley and Sons, Inc.
Keywords: Cyanate ester;dynamic mechanical analysis;differential scanning calorimetry;fourier transform infrared spectroscopy;triazine;oxazolidinone;glass transition temperature.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 17 Jul 2008
Last Modified: 19 Sep 2010 04:47
URI: http://eprints.iisc.ernet.in/id/eprint/15075

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