Effects of compositional asymmetry in phase behavior of ABA triblock copolymer melts from Monte Carlo simulation.

Abstract

We simulate ABA triblock copolymer melts using a lattice Monte Carlo method, known as cooperative motion algorithm, probing various degrees of compositional asymmetry. Selected order-disorder transition lines are determined in terms of the segment incompatibility, quantified by product χN , and the triblock asymmetry parameters, α and β. We correlate the results of the simulation with the self-consistent field theory and an experimental study of polyisoprene-polystyrene-polyisoprene triblock melt by Hamersky and coworkers. In particular, we confirm the mean-field prediction that for highly asymmetric triblocks the short A -block is localized in the middle of the B -domain due to an entropic advantage. This results in the middle block relaxation and is consistent with the experimental data indicating that as the relatively short A -blocks are grown into AB diblock, from the B -block side, the order-disorder transition temperature is considerably depressed.

DOI: 10.1140/epje/i2010-10680-5

Cite this paper

@article{Wooszczuk2010EffectsOC, title={Effects of compositional asymmetry in phase behavior of ABA triblock copolymer melts from Monte Carlo simulation.}, author={S Wołoszczuk and Michal Banaszak}, journal={The European physical journal. E, Soft matter}, year={2010}, volume={33 4}, pages={343-50} }