Accession Number : ADA306355

Title :   Controlled Formation of Carboxylic Acid Groups at Polyphosphazene Surfaces: Oxidative and Hydrolytic Routes,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF CHEMISTRY

Personal Author(s) : Allcock, Harry R. ; Morrissey, Christopher T. ; Way, Wayne K. ; Winograd, Nicholas

PDF Url : ADA306355

Report Date : MAR 1996

Pagination or Media Count : 44

Abstract : Two methods have been developed for the controlled formation of carboxylic acid at the surfaces of aryloxyphosphazene high polymers. The first involves a permanganate-induced oxidation of p-methylphenoxy side groups, with the surface density of carboxylic acids units being controlled by the ratio of p-methylphenoxy to phenoxy groups along the polymer chains. The second approach involves a base-induced hydrolysis of carboxylate ester functions at the para-positions of surface aryloxy side groups. In this method the surface density of carboxyl units is controlled by the reaction conditions, especially by the temperature and the solvent for the base. The same ester functions were converted to alcohol moieties by surface reductions using lithium aluminum hydride in diethyl ether. The surface structures before and after these reactions were studied by a combination of contact angle measurements, X-ray photoelectron spectroscopy, scanning tunnel microscopy with X-ray microanalysis, and ATR-IR spectroscopy.

Descriptors :   *POLYMERS, *SURFACES, *OXIDATION, *HYDROLYSIS, *CARBOXYLIC ACIDS, *PHOSPHAZENE, SCANNING, FUNCTIONS, DENSITY, MEASUREMENT, ALUMINUM COMPOUNDS, STRUCTURES, X RAYS, TUNNELS, MICROSCOPY, REDUCTION, CHAINS, ETHERS, ESTERS, PHENOLS, ETHYL RADICALS, ALCOHOLS, PHOTOELECTRONS, MICROANALYSIS, LITHIUM HYDRIDE.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE