APPARENT GLASSY DYNAMICS OF AN ADSORBED POLYMER-CHAIN IN THE BOND-FLUCTUATION MODEL

The dynamics of a single homopolymer chain strongly adsorbed on a flat surface is investigated by Monte Carlo simulation using the bond-fluc tuation model. Previously observed anomalous glassy dynamics at low te mperatures [Phys. Rev. E 49, 5420 (1994)] is revisited in detail. We a lso study the dynamics of a polymer chain confined in a narrow slit of width of a monomer and a modified bond-fluctuation model in three dim ensions to include more relevant bond vectors. We show that the previo usly observed glassy dynamics is due to an artifact of the bond-fluctu ation model in three dimensions in that it does not cross-over to the two dimensional bond-fluctuation model with the correct Rouse dynamics . With the proper inclusion of the extra bond vectors P(2,2,0) and P(3 ,2,0), no glassy behavior appears for the strongly adsorbed chain.