Accession Number : AD0642043

Title :   HIGH-TEMPERATURE STRUCTURAL RESINS.

Descriptive Note : Final rept. 18 Oct 65-17 Jul 66,

Corporate Author : WHITTAKER CORP SAN DIEGO CALIF NARMCO RESEARCH AND DEVELOPMENT DIV

Personal Author(s) : Hergenrother,Paul M. ; Levine,Harold H.

Report Date : 17 JUL 1966

Pagination or Media Count : 44

Abstract : The report summarizes an investigation directed toward the synthesis and evaluation of thermally stable polymers for potential use in fabricating rocket and missile components, and devices requiring deep submergence for long periods of time. Research was concentrated on three aromatic polyheterocyclics, the polyquinoxalines, the polybenzothiazoles, and a novel hybrid polymer, the phenyl-substituted polyquinoxalines. Major emphasis was placed on fabrication of laminates as large as 9 in. x 12 in. x 14 plies, and adhesive bonds from prepreg and tape prepared from stable m-cresol solutions of the polyquinoxalines. Excellent test results were obtained. Polybenzothiazole research also centered on fabrication work which provided 14-ply laminates having high individual flexural strengths and moduli. The successful preparation of an A-B monomer, 3-amino-4-mercaptobenzamide, was accomplished; this was subsequently polymerized to yield poly(2,5-benzothiazole) having polymer decomposition temperatures in air and in helium of 600C and 675C RESPECTIVELY. Novel phenyl-substituted polyquinoxalines were prepared via melt and solution polymerization to yield polymers which exhibited outstanding oxidative stability. A phenyl-substituted diether polyquinoxaline exhibited only a 7% weight loss under isothermal aging at 371C in air after 100 hours and clear, tough, yellow films exhibiting good flexibility were cast from m-cresol solutions. (Author)

Descriptors :   (*HEAT RESISTANT PLASTICS, SYNTHESIS(CHEMISTRY)), (*LAMINATES, HEAT RESISTANT PLASTICS), (*HETEROCYCLIC COMPOUNDS, POLYMERS), AROMATIC COMPOUNDS, NITROGEN HETEROCYCLIC COMPOUNDS, PHENYL ETHER, SULFUR HETEROCYCLIC COMPOUNDS, POLYMERIZATION, BONDING, ADHESIVES, THIOLS, AMIDES, PANELS, MECHANICAL PROPERTIES, FILMS

Subject Categories : Polymer Chemistry
      Adhesives, Seals and Binders
      Laminates and Composite Materials
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE