DEVELOPMENT OF LOW TEMPERATURE CURE COATING SYSTEMS FOR EXTERNAL SURFACES OF NAVAL AIRCRAFT.
Abstract
Several polymer systems have been developed including polyimide-ester (Polymer A) fluorinated imide-ester, (Polymer B) and carboranyl polyimide (Polymer C). Polymer A, when modified with an epoxy, exhibited excellent chemical resistance as well as improved physical properties especially impact strength and scratch resistance. The chemical resistance of Polymer B was especially good, but low values in some physical properties, such as impact strength, indicated the need for further development. The carboranyl polyimide system (Polymer C) which incorporates a carborane nucleus into the polyimide structure appears to hold the most promise as an organic coating, especially in regard to thermal stability. Incorporation of crosslinking showed promising results, but considerable development work is still needed. The specific material which has most closely approximated that sought after in the program is a polyimide-ester made from benzophenone-tetracarboxylic dianhydride, heptyl alcohol and oxydianiline. Modified with an epoxy this material has met most nearly the requirements. However, hydrolytic stability needs further improvement and the curing temperature is still high for field applications. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 05, 1967
- Accession Number
- AD0651996
Entities
People
- D. K. Mchugh
- J. C. Montermoso
- R. L. Taylor
- T. Saxton