In recent years, there has been substantial development of high performance epoxy resins which offer improvements in both processing and physical properties for various composites. In this study, we synthesized some kinds of dimeric naphthols and their epoxies derivatives and evaluated their cured resin properties. Two kinds of naphthols, 2,7-dihydroxynaphthalene (2,7-DHN) and 2-hydroxy naphthalene (2-HN) were reacted with formaldehyde to produce dimeric naphthols. By changing the ratio of these raw materials, we could control the functionalities of the dimeric naphthols. The epoxy resins derivatives were prepared through the reaction of the corresponding dimeric naphthol with epichlorohydrin. Herein we report the behavior of the cured with diaminodiphenyl sulfone (4,4'-DDS). In our evaluation, two functional dimeric naphthol epoxy has excellent high modulus, high Tg and low water absorption. When this epoxy resin is combined with LER (liquid Bisphenol-A epoxy resin), it showed good mechanical properties suitable for composite applications.
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