ADSORPTION OF RANDOM COPOLYMERS ON SILICA - EPR SPECTROSCOPY STUDY

Random copolymers of dimethylacrylamide and glycidyl acrylate (GA) wer e spin labeled with 4-amino tempo on a small percentage of GA groups. These copolymers were adsorbed on nonporous silica particles in chloro form and their conformation was studied by EPR spectroscopy. Influence of surface coverage was studied at two different copolymer compositio ns. The EPR results correlated with FTIR results of a previous study p erformed on the same samples and are consistent with a local stiffness dependent on the copolymer composition of the adsorbed chains. (C) 19 94 Academic Press, Inc.