BINARY MIXTURE OF GRAFTED POLYMER-CHAINS - A MONTE-CARLO SIMULATION

Grafted polymer layer composed of a binary mixture of incompatible cha ins under good solvent condition is simulated using the bond-fluctuati on model. The equilibrium structures of the partially phase separated states are investigated as a function of the incompatibility and relat ive fraction by monitoring the monomer distribution functions and the chain linear dimensions. For the case of symmetric binary mixtures, we observe the chains of the same type cluster together laterally formin g the ''ripple state'' while the layer state is never observed. For as ymmetric mixtures, layer structures with the minority chains staying f urther away from the grafting plane are observed which is in contrary to previous theoretical predictions. The heights of both the minority and majority chains in the layer state are shown to be proportional to their chain lengths.