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5962972 
Journal Article 
Multi-functional Epoxy Resins Performing High Thermal Resistance with Good Flow-ability based on Dimeric Naphthols 
Ogura, I; Takahashi, Y 
2010 
Yes 
High Performance Polymers
ISSN: 0954-0083 
22 
7 
834-847 
English 
WOS:000283444000005 
Two kinds of naphtols, 2, 7-dihydroxynaphthalene (2,7-DHN) and 2-hydroxy naphthalene (2-HN), were reacted with formaldehyde to produce dimeric naphtols. One of the products, designated as DN-a, was prepared only from 2-DHN and thus possessed tetra-functionality. Two other kinds of dimeric naphtols, DN-b and DN-c were prepared from the mixture of 2-DHN and 2-HN in different ratios providing hydroxyl functionalities of 3.0 and 2.6 for DN-b and DN-c, respectively. The epoxy resins, E-a, E-b, and E-c, were prepared by the reaction of the corresponding dimeric naphtol with epichlorohydrine. The melt viscosity of E-a was comparable with that of cresol novolac type epoxy resin (ECN), and those of E-b and E-c were sufficiently lower so as to provide better flow-ability in comparison with ECN making them potentially more useful. The cured epoxy resins in this report showed higher Tg values in comparison with that of ECN. In particular, the E-a cured resin showed a T g of 328 °C, which is the highest Tg for epoxy resins reported so far. © The Author(s), 2010. 
Epoxy resin; naphthalene; thermal property; curing reagent; accelerator; cross-linking density; flow ability; viscosity; dynamic modulus