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Thermal properties of anhydride-cured bio-based epoxy blends

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Abstract

Epoxidized palm oil (EPO) (0–12 wt%) was added into petrochemical-based epoxy blends (diglycidyl ether of bisphenol-A (DGEBA)/cycloaliphatic epoxide resin/epoxy novolac resin) to develop a thermal curable bio-based epoxy system. The thermal behaviors of the EPO, epoxy blends (EB), and bio-based epoxy blends (EB/EPO) were characterized using differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMT) and thermo-mechanical analysis (TM). The glass transition temperature (T g) and storage modulus (E′) of the EB/EPO system was reduced with the increasing of the EPO loading. This is attributed to the plasticizing effect of the EPO. It was found that epoxy blends with higher loading of EPO possessed higher coefficient of thermal expansion (CTE) and tanδ value. This is due to the increase of the free volume and chain flexibility in the three-dimensional network of the epoxy blends. The internal thermal stresses of the EB/EPO were decreased as the increasing loading of EPO, owing to the reduction of crosslink density, modulus of elasticity, and T g in the epoxy blends.

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Acknowledgements

The authors would like to express their appreciation to Universiti Sains Malaysia for the research grant and Cape Technology Sdn Bhd for their technical support.

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  1. School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia

    S. G. Tan & W. S. Chow

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  1. S. G. Tan
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  2. W. S. Chow
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Correspondence to W. S. Chow.

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Tan, S.G., Chow, W.S. Thermal properties of anhydride-cured bio-based epoxy blends. J Therm Anal Calorim 101, 1051–1058 (2010). https://doi.org/10.1007/s10973-010-0751-7

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