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Rheological and mechanical properties of DGEBA‐S epoxy copolymer initiated by N ‐benzylquinoxalinium hexafluoroantimonate
Author(s) -
Park SooJin,
Kang JunGil,
Kwon SooHan
Publication year - 2005
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1783
Subject(s) - epoxy , materials science , copolymer , cationic polymerization , toughness , rheology , dynamic mechanical analysis , casting , isothermal process , polymer chemistry , composite material , polymer , thermodynamics , physics
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