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Flammability Studies of New Cyanate Ester Resins.


pdf icon Flammability Studies of New Cyanate Ester Resins. (646 K)
Gilman, J. W.; Harris, R. H., Jr.; Brown, J. E.

Evolving Technologies for the Competitive Edge. SAMPE Symposium and Exhibition, 42nd International Proceedings. Volume 42. Book 2. Society for the Advancement of Material and Process Engineering (SAMPE). Proceedings. May 4-8, 1997, Anaheim, CA, Haulik, T.; Bailey, V.; Burton, R., Editor(s)(s), 1052-1061 pp, 1997.

Keywords:

cyanate ester; flammability; synthesis; polyptyrene; toughening

Abstract:

We have synthesized several new cyanate ester functionalized polystyrene polymers and copolymers. Poly(4-cyanatostyrene), PCS, poly(4-cyanatostyrene) "polymer grade", PCS-PG, poly(4-cyanatostyrene "novalak grade", PCS-NG, poly(4-cyanatostyrene-co-methylmethacrylate), PCS-MMA, and poly(4-cyanatostyrene-co-1,3-butadiene), PCS-BD, were all prepared via cyanation of the corresponding 4-hydroxystyrene polymer or copolymer, using cyanogen bromide and triethylamine. The synthesis gives good yields of these polymers. Differential scanning calorimetry, DSC, of these polymers shows that they cure completely under standard, non-catalyzed, thermal cure conditions. flammability tests, performed using the a Microscale Combustion Calorimeter, show significant differences in flammability of the cured polymers, depending on polymer structure.