Effects of Chain Length and Concentration of Block Copolymer on the Phase Separation of A/B/A-B System by TDGL Simulation

Abstract

Abstract: The free energy functional for the time dependent Ginzburg-Landau equation were obtained by means of Flory-Huggins free energy. The couplings between different order parameters and the chain lengths were included. The phase behavior of A/B/A-B system at different A-B chain lengths and concentrations were simulated. For the same chain length and concentration of homopolymer A and B, there is an optimum chain length of diblock copolymer to minimize the mean domain size. At the fixed chain length of the homopolymer and diblock copolymer, the structures of the mixture are greatly different when the concentration of diblock copolymer is different. Furthermore, the phase domain structures are different at different concentrations of homopolymer A and B.

Key words: Computer simulation, Phase separation, Ternary blend, Block copolymer

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YE Xiang-Gui, SUN Zhao-Yan, AN Li-Jia. Effects of Chain Length and Concentration of Block Copolymer on the Phase Separation of A/B/A-B System by TDGL Simulation[J]. Chem. J. Chinese Universities, 2005, 26(2): 356.

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Effects of Chain Length and Concentration of Block Copolymer on the Phase Separation of A/B/A-B System by TDGL Simulation

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