Critical adsorption of an end-grafted diblock copolymer on a flat surface

The critical adsorption of a single flexible diblock copolymer AnBm on a flat surface selective to block A is investigated by using the Monte Carlo simulation method. The surface is modeled as attractive to block A but inert to block B, whereas the head monomer A is grafted on the surface. The results show that the critical adsorption temperature, Tc, and the crossover exponent, φ, are the same as that of homogeneous polymer An for large n values. Although the B block decreases the A block surface-contact number and lowers the adsorption temperature of the finitely long polymer, the effect is eliminated with the increase in the length of the A block. However, we find that the B block has no influence on the mean asphericity parameter of the A block at Tc.