Accession Number : AD0475510


Title :   DEVELOPMENT OF POLYIMIDE RESIN BASED STRUCTURAL ADHESIVES AND LAMINATES FOR LONG TIME HIGH TEMPERATURE USE.


Descriptive Note : Final technical summary rept. 2 Jan 64-30 Apr 65,


Corporate Author : WESTINGHOUSE RESEARCH LABS PITTSBURGH PA


Personal Author(s) : Freeman, James H ; Frost, Lawrence W ; Burgman, Herbert A ; Bower, George M ; Ruffing, Charles R


Report Date : Aug 1965


Pagination or Media Count : 175


Abstract : Successful use of aromatic polyimide resins as useful adhesive bonds for stainless steel and Ti metals at elevated temperatures is reported. High strength ( 1000 psi) at temperatures up to 700 F were maintained for long aging periods. Life expectancy of the best materials range from about 1500 hours at 550 F to about 40 hours at 700 F. The effect of additives on the aging properties of the polymers was determined. Press conditions for creating a bond are moderate but a high temperature is required. A new copolymer of benzimidazole and imide linkages provided superior bonds for Ti alloys. Optimum formulations and bonding conditions were established. Similar polymer structures are useful in reinforced laminates for periods of 1000 hours or more in air at 600 F. This work was extended to encompass the effects of molecular weight control, copolymer formation, and cross linked imide structures. Considerable improvement in strength properties was realized. Several filler materials including type S994 glass were examined and the effect of glass finishes was studied. Good water boil resistance is possible when the proper finish is employed. (Author)


Descriptors :   *HEAT RESISTANT PLASTICS , *ADHESIVES , *LAMINATES , HEAT RESISTANT PLASTICS , BINDERS , BONDING , TITANIUM ALLOYS , STAINLESS STEEL , POLYAMIDE PLASTICS , HIGH TEMPERATURE , HIGH PRESSURE , AGING(MATERIALS) , LIFE EXPECTANCY(SERVICE LIFE) , SYNTHESIS(CHEMISTRY) , POLYMERS , BENZIMIDAZOLES , AMINO PLASTICS , CROSSLINKING(CHEMISTRY) , REINFORCING MATERIALS , GLASS TEXTILES , LAMINATED PLASTICS , ADDITIVES , PROCESSING , MOLECULAR STRUCTURE , MOLECULAR WEIGHT


Subject Categories : Adhesives, Seals and Binders
      Laminates and Composite Materials


Distribution Statement : APPROVED FOR PUBLIC RELEASE