Accession Number : ADA326701

Title :   Organo-Aluminate Polymeric Materials as Advanced Erosion/Corrosion Resistant Thin Film Coatings.

Descriptive Note : Quarterly rept. no. 4.

Corporate Author : TDA RESEARCH INC WHEAT RIDGE CO

Personal Author(s) : Cook, Ronald L. ; Barron, Andrew R. ; Stoffer, James O. ; Anderson, Harlan

PDF Url : ADA326701

Report Date : JUN 1997

Pagination or Media Count : 12

Abstract : The primary goal of the DARPA program is the development of carboxylato-alumoxane based coating systems for repair and maintenance of DoD aircraft coatings. The proposed coating systems can potentially offer improved durability and corrosion protection, while avoiding the use of chromates and minimizing the emissions of both volatile organic compounds (VOCs) and hazardous air pollutants (HAPs). The coating system is based on the development of carboxylato- alumoxane precursors for fabrication of corrosion resistant oxide barrier layers and alumoxane-epoxy based primer coats. Carboxylato-alumoxanes are low-cost nanocomposite materials prepared from the reaction of carboxylic acids and the mineral boehmite (AlOOH), ^1/lb). The carboxylic acids are bound to the surfaces of the boehmite particles. The alumoxanes can be directly bonded into polymer matrices by the use of carboxylic acids that have the appropriate functional groups (i.e. -OH, -NH2, etc). The bonding of the particles to the polymer matrix reduces the voids inherent in filled polymers at the interface of hydrophilic fillers and hydrophobic polymers. The 'filled' alumoxane-epoxies potentially offer better barrier properties and improved mechanical properties over current epoxy corrosion coatings.

Descriptors :   *AIRCRAFT MAINTENANCE, *PROTECTIVE COATINGS, AIR POLLUTION, LOW COSTS, POLYMERS, COMPOSITE MATERIALS, THIN FILMS, CHROMATES, CORROSION INHIBITION, MATRIX MATERIALS, REPAIR, VOLATILITY, MINERALS, HYDROPHOBIC PROPERTIES, CARBOXYLIC ACIDS, FILLERS, ALUMINATES, BARRIER COATINGS, BOEHMITE.

Subject Categories : Aircraft
      Polymer Chemistry
      Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE