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Synthesis of novel epoxy hardeners and properties of cured products

Xiaoliang Zeng, Jia Liu, Junren Chen, Hanping Liu, Xinnian Xia

A series of phenol-HPM-dicyclopentadiene (PHD) resins were synthesized through the Friedel-Crafts reaction of phenol,N-(4-hydroxy phenyl)maleimide (HPM) and dicyclopentadiene. The PHD resinswere characterized by FTIR, 1HNMR, Gel Permeation Chromatography (GPC) and Elemental analyses. The PHD resins were used as curing agents for o-cresol formaldehyde novoloc epoxy (CNE) resin. The thermal stability of cured epoxy resins was determined by termogravimetric analysis (TGA). The obtained results showed that the cured epoxy resins exhibited good thermal stability (5% degradation temperature > 330 ºC) and high char yield (800 ºC, 47.2%). The moisture absorptions of cured epoxy resins were also tested. The results showed that the cured epoxy resins had lower moisture absorption (1.13%-1.54%) than that of the epoxy resin cured by phenol formaldehyde novolac (PN) resin (1.72%).Moreover, the thermal stability andmoisture absorption of the cured epoxy resins were found to be increased with the increase of HPM content