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Research Article

Thermomechanical behavior of epoxy resins modified with epoxidized vegetable oils

Fan‐Long Jin

Department of Chemical Engineering, Jilin Institute of Chemical Technology, Jilin City 132022, People's Republic of China

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Soo‐Jin Park

Corresponding Author

E-mail address:sjpark@inha.ac.kr

Department of Chemistry, Inha University, Nam‐gu, Incheon 402‐751, South Korea

Department of Chemistry, Inha University, Nam‐gu, Incheon 402‐751, South Korea
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First published: 22 January 2008
Cited by: 61

Abstract

Biobased epoxy materials were prepared from diglycidyl ether of bisphenol A (DGEBA) and epoxidized vegetable oils (EVOs) (epoxidized soybean oil and epoxidized castor oil) with a thermally latent initiator. The effects of EVO content on the thermomechanical properties of the EVO‐modified DGEBA epoxy resins were investigated using several techniques. Differential scanning calorimetry indicated that the cure reaction of the DGEBA/EVO systems proceeded via two different reaction mechanisms. Single and composition‐dependent glass transition temperature (Tg) mechanisms were observed for the systems after curing. The experimental values of Tg could be explained by the Gordon–Taylor equation [Gordon M and Taylor JS, J Appl Chem 2:493 (1952)]. The thermal stability of the systems decreased as the EVO content increased, due to the lower crosslinking density of the DGEBA/EVO systems. The coefficient of thermal expansion of the systems was found to increase linearly with increasing EVO content. This could be attributed to the fact that the degrees of freedom available for motions of the segments of the macromolecules in the network structure were enhanced by the addition of EVO. Copyright © 2008 Society of Chemical Industry

Number of times cited: 61

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