POLYMER ADSORPTION ON PLANAR RANDOM SURFACES

The adsorption transitions of a single self-avoiding polymer chain at chemically heterogeneous surfaces have been investigated using Monte C arlo methods and analyzed using scaling arguments. Evidence is provide d that the crossover exponent phi, characterizing the transition betwe en the weakly and the strongly adsorbed states, depends linearly on th e dilution 0.6 less than or equal to p less than or equal to 1 of adso rbing sites on the surface, phi(p) approximate to 0.35 + 0.2p. The tra nsition temperatures of chains of length N scale according to T-c(N,p) /T-c((infinity),p) similar to N- phi(p). In particular, we have analyz ed the adsorption energies and the parallel and perpendicular componen ts of the end-to-end distance. (C) 1998 American Institute of Physics.