Accession Number : ADA320471

Title :   Structure-Property Behavior of Organic-Inorganic Hybrid Materials Based on Sol Gel Chemistry,

Descriptive Note : Final rept. 1 Mar 94-31 Aug 96,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF CHEMICAL ENGINEER ING

Personal Author(s) : Wilkes, Garth L.

PDF Url : ADA320471

Report Date : 06 DEC 1996

Pagination or Media Count : 95

Abstract : This work was directed at the synthesis and structure-property behavior of hybrid organic-inorganic network materials prepared by a sol gel reaction. Specific focus concerned the development of optically abrasion resistant coatings that could be utilized for both polymeric and metallic substrates. In the case of the latter, the purpose of the coating was to not only to supply abrasion resistance but, if possible, provide corrosion resistance as well. Considerable success was achieved in that several hybrid coatings were synthesized by reacting one or more metal alkoxides with functionalized organic moieties such as triethoxysilanated diethylene triamine (DETA) and related diamines or di or triol species. These functionalized organics, in conjunction with the alkoxide, were spin or dip coated on appropriate substrates and thermally cured. In some cases a primer molecule was also utilized to promote higher adhesion with the substrate the principal example being amino propyltrimethoxysilane. It has been demonstrated that the coatings display very good abrasion resistance for polymeric substrates, aluminum and copper but do not perform as well on steel or a phosphate coated steel. The final portion of the work concerned the development of porous inorganics made by the calcination of hybrid organic-inorganic network materials but where these networks were prepared by the use of functionalized polytetramethylene oxide oligomers of varied molecular weight that had been reacted with tetraethylorthosilicate (TEOS). It was demonstrated that calcination of these materials could lead to porous silicate powders possessing a specific surfaces near 1000 meters2/gram. Furthermore, pore size characteristics of these powders were analyzed. It was concluded that such hybrid materials could serve as the base for developing highly porous powder materials for chromatography, catalyst

Descriptors :   *ORGANIC MATERIALS, *HYBRID SYSTEMS, *INORGANIC MATERIALS, *SOL GEL PROCESSES, OPTICAL PROPERTIES, SYNTHESIS, MOLECULES, POLYMERS, POWDERS, ADHESION, MOLECULAR WEIGHT, SUBSTRATES, STEEL, DISPLAY SYSTEMS, PRIMERS, COATINGS, AMINES, CORROSION RESISTANCE, OXIDES, COPPER, ALUMINUM, CATALYSTS, METHYLENES, SILICATES, METAL COMPOUNDS, POROUS MATERIALS, OLIGOMERS, CHROMATOGRAPHY, WEAR RESISTANCE, PHOSPHATES, ETHYLENES, ALKOXY RADICALS, ABRASION.

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE