Structure-Property Behavior of Organic-Inorganic Hybrid Materials Based on Sol Gel Chemistry,
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
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 06, 1996
- Accession Number
- ADA320471
Entities
People
- Garth L. Wilkes
Organizations
- Virginia Tech