Accession Number : ADA310549

Title :   Tert-Butyl Alumoxanes: Synthetic Analogs for Methyl Alumoxane (MAO) and New Catalytic Routes to Polyolefins and Polyketones.

Corporate Author : RICE UNIV HOUSTON TX DEPT OF CHEMISTRY

Personal Author(s) : Barron, Andrew R.

PDF Url : ADA310549

Report Date : 01 JUL 1996

Pagination or Media Count : 11

Abstract : Alumoxanes are the products from the partial hydrolysis of aluminum compounds. While they have been known for over 30 years, and as a class of chemical are highly important industrially, there has been almost no basic understanding of their structure, reactivity, or potential as new inorganic polymers. The aim of this research was to gain a fundamental understanding of alumoxanes and to enable multiple practical applications to be generated from such understanding. Three areas were originally targeted: (1) alumoxanes as ceramic precursors, (2) alkylalumoxanes as polymerization catalysts, and (3) alumoxanes as materials in their own right. Significant advances have been made in the first two areas. We demonstrated that alumoxanes formed from the hydrolysis of aluminum compounds during ceramic synthesis are not linear polymers as previously depicted, but nano-sized molecules consisting of a boehmite-like core and an organic periphery. This allowed for the rational synthesis of alumoxanes from a commercially viable starting material, boehmite (Al(O)(OH)). We have previously crystallographically characterized alkylalumoxanes and shown that the active catalysts are cages whose activity is dependent on their 'latent Lewis acidity'. Future research is primarily directed towards the application of alumoxanes as materials for new Li(+) and H(+) electrolytes for battery and fuel cell applications, photochromic materials, polymer lasers, and NLO materials.

Descriptors :   *ALUMINUM COMPOUNDS, *METHYL RADICALS, *BUTYL RADICALS, *CATALYSIS, *KETONES, *OLEFIN POLYMERS, LINEAR SYSTEMS, SYNTHESIS, MATERIALS, POLYMERS, PRECURSORS, POLYMERIZATION, REACTIVITIES, LASERS, CERAMIC MATERIALS, ANALOGS, CATALYSTS, HYDROLYSIS, FUEL CELLS, POLYETHYLENE PLASTICS, BOEHMITE, INORGANIC POLYMERS, PHOTOCHROMIC MATERIALS.

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE