Accession Number : ADA316480

Title :   Novel Polymeric Composites Through Molecular Engineering.

Descriptive Note : Final rept. 1 Jul 92-30 Jun 96,

Corporate Author : CINCINNATI UNIV OH DEPT OF CHEMISTRY

Personal Author(s) : Mark, J. E.

PDF Url : ADA316480

Report Date : 16 SEP 1996

Pagination or Media Count : 8

Abstract : The research projects covered in this grant developed techniques for improving the properties of three classes of high-temperature polymers of particular interest to the US Air Force, specifically some polyamides, polyimides, and polybenzoxazoles and polybenzobisthiazoles. Mechanical properties were of primary interest, and were improved by precipitating ceramic-type fillers such as silica and titania into them in-situ, using sol-gel hydrolysis and condensation reactions. There was also an important bonus in forming hybrid organic-inorganic composites obtained in this way, specifically decreased water absorption. Such suppression of water absorption is important for maintaining mechanical properties such as dimensional stability, and for control of some dielectric properties as well. The improvements obtained were found to be greatest when a bonding agent was used to improve the interfacial bonding between the organic polymer phases and the inorganic ceramic phases. These bonding agents also have the advantage of improving the transparencies of these materials.

Descriptors :   *POLYMERS, *COMPOSITE MATERIALS, *ENGINEERING, MECHANICAL PROPERTIES, STABILITY, AIR FORCE, INTERFACES, SILICON DIOXIDE, WATER, HIGH TEMPERATURE, PHASE, CERAMIC MATERIALS, DIELECTRIC PROPERTIES, ORGANIC MATERIALS, BENZOXAZOLES, BONDING, ABSORPTION, SUPPRESSION, INORGANIC MATERIALS, FILLERS, TRANSPARENCIES, POLYIMIDE RESINS, CONDENSATION REACTIONS, SOL GEL PROCESSES.

Subject Categories : Polymer Chemistry
      Inorganic Chemistry
      Organic Chemistry
      Physical Chemistry
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE