Abstract
The effects of epoxy resin structure on the relative curing rate with polymercaptans has been studied. The curing rate decreased with increasing basicity (e. g. higher
pka) of raw material of epoxy resins : aliphatic amine<<aromatic amine<<phenol <carboxylic acid. These oder of the curing rate was the same for the epoxy resins with aromatic amine.
The study of dynamic mechanical properties of these cured epoxy resins revealed that tetra-functional resin, e. g. TGMXDA and TGDDM, had higher crosslinking density (ρ
(E′)) and glass transition temperature (Tg) than di-functional resin, e. g. DGEPA and DGEBA. The resin with two aromatic rings e. g. DGEBA and TGDDM, had same ρ
(E′) for the resin with one, e. g. DGEPA and TGMXDA, but had higher Tg.
Some mechanical and bonding property of the cured resins was also studied.
