RESEARCH AND DEVELOPMENT OF HIGH-TEMPERATURE STRUCTURAL ADHESIVES.
Quarterly progress rept. no. 2, 1 June-31 Aug 63.
WHITTAKER CORP SAN DIEGO CALIF NARMCO RESEARCH AND DEVELOPMENT DIV
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The objective of this project is the synthesis of thermally and hydrolytically stable organic polymers. The approach being followed is the condensation of selected reactants to form a polymeric chain of aromatic nuclei joined through heterocyclic groups so that aliphatic C-C and C-H bonds are absent. A mechanism which agreed with the observed kinetic and spectroscopic data was proposed for the formation of a typical polyimide. Polyoxy-p,pphenylenepyromellitimide, prepared from pyromellitic dianhydride and p,p-diaminodiphenyl ether, gave a weight loss of only 6.55 at 1100 F after thermogravimetric analysis in air. A meltable polyimide prepolymer was obtained from the reaction of pyromellitic dianhydride with 0,p-diaminodiphenyl ether. A two-ply benzophenone based polyimide laminate gave a maximum room temperature flexural strength of 68,600 psi and a modulus of 4.05 x 10 to the 6th power psi. After 1 hour at 1000 F, the flexural strength was 13,895 psi and the modulus 1.30 x 10 to the 6th power psi. Author