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Cyanate esters with improved fire resistance
Cyanate ester resins are organic thermosetting resins that have been used for high temperature applications. Several commercial cyanate esters have been shown to exhibit relatively high onset temperature of degradation in excess of 400 degree C with some inherent self-extinguishing characteristics. However, in order for cyanate esters to meet the new stringent requirement for the future aircraft interior applications, further improvements are necessary. A series of cyanate esters with novel structures have been prepared and studied for their flame-resistance with microcalorimeters. Several materials displayed low micro heat release rates (less than 25 Joule/g-degree K). Among them, RD98-228 has exhibited micro heat release rate of about 8 Joule/g-degree K. It is a solid at room temperature and the melting point is about 75 degree C. It has low viscosity at processing temperature. It can be cured and processed like a typical cyanate ester resin. The specimens of cured neat resin of RD 98-228 have exhibited high Tg (275 degree C) and high mechanical strength, which are typical of cyanate esters. The results of initial studies of flame-resistance of RD98-228 are rather promising. The composites of RD98-228 with glass or carbon fabric have displayed heat release rates of 11 to 12 kW/m2 under 35 kW/m2 of heat flux in the OSU test. The sandwich panels of RD98-228 and carbon or glass fabric with Nomex honeycomb have exhibited heat release rate about 20 kW/m2. RD98-228 is currently under further evaluation and development.
Cyanate esters with improved fire resistance
Cyanate ester resins are organic thermosetting resins that have been used for high temperature applications. Several commercial cyanate esters have been shown to exhibit relatively high onset temperature of degradation in excess of 400 degree C with some inherent self-extinguishing characteristics. However, in order for cyanate esters to meet the new stringent requirement for the future aircraft interior applications, further improvements are necessary. A series of cyanate esters with novel structures have been prepared and studied for their flame-resistance with microcalorimeters. Several materials displayed low micro heat release rates (less than 25 Joule/g-degree K). Among them, RD98-228 has exhibited micro heat release rate of about 8 Joule/g-degree K. It is a solid at room temperature and the melting point is about 75 degree C. It has low viscosity at processing temperature. It can be cured and processed like a typical cyanate ester resin. The specimens of cured neat resin of RD 98-228 have exhibited high Tg (275 degree C) and high mechanical strength, which are typical of cyanate esters. The results of initial studies of flame-resistance of RD98-228 are rather promising. The composites of RD98-228 with glass or carbon fabric have displayed heat release rates of 11 to 12 kW/m2 under 35 kW/m2 of heat flux in the OSU test. The sandwich panels of RD98-228 and carbon or glass fabric with Nomex honeycomb have exhibited heat release rate about 20 kW/m2. RD98-228 is currently under further evaluation and development.
Cyanate esters with improved fire resistance
Lin, Borsheng (author)
1999
7 Seiten, 9 Quellen
Conference paper
English
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