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Physical and Mechanical Interfacial Properties of Epoxy Copolymers Initiated by Latent Thermal Catalysts
Author(s) -
Park SooJin,
Kang JunGil,
Kwon SooHan
Publication year - 2004
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200300373
Subject(s) - epoxy , diglycidyl ether , materials science , curing (chemistry) , thermal stability , catalysis , bisphenol a , composite material , copolymer , cationic polymerization , dynamic mechanical analysis , polymer chemistry , chemical engineering , polymer , organic chemistry , chemistry , engineering
Summary: The epoxy copolymers containing sulfone groups, diglycidyl ether of bisphenol‐A – Bisphenol‐S (DGEBA‐S) were synthesized by a hot‐melt method. The thermal properties of the epoxy systems initiated by two cationic latent catalysts, i.e., N ‐benzylpyrazinium hexafluoroantimonate (BPH) and N ‐benzylquinoxalinium hexafluoroantimonate (BQH), were investigated by using a dynamic DSC, DMA, and TGA. The mechanical properties were measured by single‐edge‐notched (SEN) beam fracture toughness tests. As a result, the thermal stability and mechanical interfacial properties of the DGEBA‐S/catalyst system were found to be higher than those of the DGEBA/catalyst. This was probably due to the fact that the introduction of sulfone groups with a polar nature to the main chain of the epoxy resins led to an improvement of thermal stability and toughness of the cured epoxy copolymers.Conversion of the epoxy/catalyst systems as a function of curing temperature.