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Rheological and mechanical properties of DGEBA‐S epoxy copolymer initiated by N‐benzylquinoxalinium hexafluoroantimonate

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The rheological and mechanical properties of the DGEBA‐S epoxy copolymer initiated by N‐benzylquinoxalinium hexafluoroantimonate (BQH) as a cationic latent thermal catalyst were investigated. The rheological properties of the DGEBA‐S/BQH system were investigated using a rheometer under isothermal conditions, and the mechanical properties of the casting specimens, involving flexure and impact tests, were also performed. The crosslinking activation energy and mechanical properties of the DGEBA‐S/BQH system were higher than those of the DGEBA/BQH system. This could be attributed to the introduction of sulfone groups with a polar nature to the main chain of the epoxy resins which led to a decrease of molecular motion and an improvement in the toughness of the cured epoxy copolymers. Copyright © 2005 Society of Chemical Industry
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Keywords: activation energy; catalyst; epoxy resins; mechanical behavior; rheological properties

Document Type: Research Article

Affiliations: 1: Advanced Materials Division, Korea Research Institute of Chemical Technology, PO Box 107, Yusong, Daejeon 305-600, South Korea 2: Department of Chemistry, Chungbuk National University, Cheongju 361-763, South Korea

Publication date: 2005-06-01

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