Recent advances in the development of composites based on the NCNS resinsThe NCNS resins, a new class of addition polymerized polyaromatic melamines, have undergone further development in the past year. Pilot plant quantities of resin NCNS-12M have been made available for evaluation. High solids laminating varnishes were prepared in alcohol/ethyl acetate and alcohol/chlorinated solvent mixtures. The prepregs had sufficient room temperature stability after three month storage to retain good processing characteristics and good bonded mechanical properties. Laminates were fabricated by vacuum bag-autoclave processing and by 5 minute press molding cycles. These laminates had low flame spread and low smoke emitting properties and retained good elevated temperature properties upon long-term oxidative aging. Humidity aging studies were carried out for 30 days at 95% R.H., 120 F. on NCNS/graphite fiber laminates. Initial results indicate that the NCNS resins, particularly those prepared from polymethylene polyphenylamines, are resistant to environmental degradation of elevated temperature mechanical strength.
Document ID
19770053824
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Kray, R. J. (Ciba-Geigy Corp. Ardsley, N.Y., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1976
Subject Category
Composite Materials
Meeting Information
Meeting: National Technical Conference on Bicentennial of materials