RESEARCH AND DEVELOPMENT OF HIGH-TEMPERATURE STRUCTURAL ADHESIVES.
Abstract
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. Poly(oxy-p,p'phenylenepyromellitimide), 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1963
- Accession Number
- AD0420111