New hybrid thermosets based on epoxy resins and benzocylobutenes
- 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
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