MONTE-CARLO SIMULATION AND SELF-CONSISTENT-FIELD THEORY FOR A SINGLE BLOCK-COPOLYMER CHAIN IN SELECTIVE SOLVENTS

A self-consistent field (SCF) theory and a Monte Carlo (MC) simulation technique have been developed for block copolymer systems. Calculatio ns were carried out using both SCF theory (with a simple mean-field po tential) and MC simulation for an AB diblock copolymer chain for a wid e range of solvent conditions. Fairly good agreement between these two methods was found. For an ABA triblock copolymer, a sharp transition between two conformations was observed by MC simulation: in one state conformation the copolymer has two collapsed A globules at either end of the B block chain and in the other state conformation one collapsed A globule comprising of the two A blocks with a loop of the B block c hain sticking out. It is our strong suspicion that this would be a tru e phase transition in the limit of infinite chain length. Copyright (C ) 1996 Elsevier Science Ltd.