New hybrid thermosets based on epoxy resins and benzocylobutenes

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:215176

Brennan, D J; White, J E; Burks, B T ^[1]

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1. Dow Chemical Co., Midland, MI (United States)

A series of new, one component thermosets have been prepared by combining Dow`s epoxy resin and benzo-cyclobutene (BCB) technologies. The hybrid epoxy/BCB thermosetting monomers are prepared in the melt by reactions of amine-, phenol-, and carboxyl-functionalized benzocyclobutenes with epoxy-containing species such as bisphenol-A diglycidyl ether, chain-extended bisphenol-A epoxy resins, 9,9-bis(4-glycidyloxy-phenyl)fluorene, and epichlorohydrin. The monomers have outstanding processing characteristics, potentially long shelf life, and the convenience of an uncatalyzed, thermally cured, one component system. The resins are cured at >170{degrees}C (T{sub max}=260{degrees}C) and exhibit glass transition temperatures (Tg) of 85 to over 250{degrees}C. The examples shown below (n=0, 1, and 3.5) were prepared as part of this work. The chain extended species (n=3.5) is an extraordinarily tough thermoset, with a fracture toughness (K{sub Ic}) of over 3,000 psi-in{sup 0.5}.

• OSTI ID: 215176
• Report Number(s): CONF-950801--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CYCLOALKENES
EPOXIDES
FRACTURE PROPERTIES
PROCESSING
RESINS
TRANSITION TEMPERATURE