Controlled Formation of Carboxylic Acid Groups at Polyphosphazene Surfaces: Oxidative and Hydrolytic Routes,
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1996
- Accession Number
- ADA306355
Entities
People
- Christopher T. Morrissey
- Harry R. Allcock
- Nicholas Winograd
- Wayne K. Way
Organizations
- Pennsylvania State University