SURFACE FUNCTIONALIZATION OF POLY(ETHYLENE TEREPHTHALATE) FILM AND MEMBRANE BY CONTROLLED WET CHEMISTRY - CHEMICAL CHARACTERIZATION OF CARBOXYLATED SURFACES

摘要

Surface functionalization of poly(ethylene terephthalate) (PET) film or track-etched membrane was performed using the methods of organic synthesis conducted at the solid-liquid interface. Basic hydrolysis in aqueous acetonitrile followed by permanganate oxidation in diluted sulfuric acid created new carboxylic chain-ends. These reactive functions were assayed as follows: (i) activation with water soluble carbodiimide; (ii) coupling to H-3-labeled amino acids; and (iii) liquid scintillation counting of the sample-associated radioactivity. Some samples were also analyzed by X-ray photoelectron spectroscopy. Depending on the experimental conditions (temperature and duration of treatment), about 1-2% of the surface repeated units could be functionalized without deterioration of the polymer bulk. This study establishes the best conditions for the covalent anchorage of bioactive substances on the PET surface. (C) 1995 Academic Press, Inc. [References: 64]