Polyenamines from aromatic diacetylenic diketones and diamines

US4663483A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Paul M. Hergenrother · Yorktown, US
• Robert G. Bass · Richmond, US
• Mark S. Sinsky · Akron, US
• John W. Connell · Newport News, US

Key dates

• Filing date: May 15, 1985
• Grant date: May 5, 1987
• Expiry date: May 15, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The synthesis and characterization of several polyenamine ketones are discussed wherein conjugated diacetylenic diketones and aromatic diamines are used as a route to the formation of high molecular weight polyenamine ketones which exhibit good mechanical properties and can be cast into creasible films. Typical polymerization conditions involved the reaction of stoichiometric amounts of 1,4- or 1,3-PPPO and a diamine at 60.degree.-130.degree. C. in m-cresol at (w/w) solids content of 8-26% for a specified period of time under a nitrogen atmosphere. Novel polyenamine ketones were prepared with inherent viscosities as high as 1.99 dl/g and tough, clear amber films with tensile strengths of 12,400 psi and tensile moduli of 397,000 psi were cast from solutions of the polymers in chloroform. The polymers exhibited T.sub.g s as high as 235.degree. C. and weight losses of 14% after aging at 232.degree. C. in circulating air for sixty hours. The specific conditions for the preparation of the various polyenamine ketones are presented in Table I. In most cases, the elemental analyses for the polynamine ketones, shown in Table II, agree within .+-.0.3% of the theoretical values.