A review with 11 refs. on the use of surface functionalization and other modification methods to obtain materials with controlled properties for specific applications and the methods for characterization of modified polymers, esp. XPS methods. Polypyrrole films were prepd. by potentiostatic method, then over-oxidized for 5 h at +0.7 V vs. Ag/AgCl in a sodium phosphate buffer; oxidn. led to formation of carbonyl and carboxy groups on the surface. The functional groups were confirmed by selective esterification and labeling. The electrochem. modified polypyrrole showed excellent built-in permselectivity; when used to immobilize enzymes, serious interferents such as ascorbic acid, acetaminophen, uric acid, and cysteine were fully rejected. Poly(o-phenylenediamine) films were grown by cyclic voltammetry from solns. buffered at pH 1, 3, 5, 7; XPS data show a structure intermediate between polyphenazine and polyaniline, with the polyaniline character increasing with pH. The permselectivity of poly(o-phenylenediamine) films obtained at pH 5 is very high and is attributed to hydrophobic interactions and effective H bonding. Other examples are given in development of biocompatible surfaces
Application oriented polymer surface modifications: How to perform; how to control
MALITESTA, Cosimino
1998-01-01
Abstract
A review with 11 refs. on the use of surface functionalization and other modification methods to obtain materials with controlled properties for specific applications and the methods for characterization of modified polymers, esp. XPS methods. Polypyrrole films were prepd. by potentiostatic method, then over-oxidized for 5 h at +0.7 V vs. Ag/AgCl in a sodium phosphate buffer; oxidn. led to formation of carbonyl and carboxy groups on the surface. The functional groups were confirmed by selective esterification and labeling. The electrochem. modified polypyrrole showed excellent built-in permselectivity; when used to immobilize enzymes, serious interferents such as ascorbic acid, acetaminophen, uric acid, and cysteine were fully rejected. Poly(o-phenylenediamine) films were grown by cyclic voltammetry from solns. buffered at pH 1, 3, 5, 7; XPS data show a structure intermediate between polyphenazine and polyaniline, with the polyaniline character increasing with pH. The permselectivity of poly(o-phenylenediamine) films obtained at pH 5 is very high and is attributed to hydrophobic interactions and effective H bonding. Other examples are given in development of biocompatible surfacesI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
