EXAMINATION OF SURFACES OF SOLID POLYMERS BY INVERSE GAS-CHROMATOGRAPHY .1. DISPERSIVE PROPERTIES

The application of inverse gas chromatography (i.g.c.) for the examina tion of surface properties of solid materials is discussed. A group of analogous poly(dimethacrylate)s differing only by the presence and ty pe of the heteroatom in the ester group and two reference polymers wer e characterized by means of this method. In this paper the dispersive properties expressed by gamma(s)(d) and C'P-DS determined at various t emperatures (50-70 degrees C) are presented and discussed. It was foun d that chemically similar polymers may be differentiated in terms of t heir dispersive parameters. The values of gamma(s)(d) and C'P-DS depen d on the temperature of the i.g.c. measurement, which is determined by the relative temperature gradient. During heat treatment at 80 degree s C and 160 degrees C, the surfaces of the polymers undergo significan t modification depending on the annealing atmosphere (helium or air). This modification is revealed by changes in the dispersive parameters and variations in the relative temperature gradients. The relationship between gamma(s)(d) and C'P-DS is linear, but the plots are unique fo r each polymer.