MEMBRANE FLUCTUATION AND POLYMER ADSORPTION

We investigate adsorption behaviors and desorption transitions of a fl exible but self-avoiding polymer on a fluctuating (undulating) membran e (or interface). Incorporating hard-wall repulsion with polymer-membr ane attraction of finite range, we find that the membrane fluctuation gives rise to an effective repulsion and enhances unbinding (desorptio n) transition of polymer, lowering the transition temperature. Employi ng hard square-well model as an example, we calculate the desorption t ransition temperature and the critical behaviors of polymer and membra ne fluctuations. Our results are qualitatively different from those of Garel, Kadar and Orland (Europhys. Lett. 29 (1995) 303) who employed a contact attractive potential which allows the polymer to permeate th e other side of the surface.