Stability of Perpendicular and Parallel Lamellae within Lamellae of Multiblock Terpolymers

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• 作者：Yuci Xu ; Weihua Li ; Feng Qiu ; Yuliang Yang ; An-Chang Shi
• 刊名：Journal of Physical Chemistry B
• 出版年：2010
• 出版时间：November 25, 2010
• 年：2010
• 卷：114
• 期：46
• 页码：14875-14883
• 全文大小：432K
• 年卷期：v.114,no.46(November 25, 2010)
• ISSN：1520-5207

文摘

The phase behaviors of multiblock terpolymer A(BC)_nB (or A(BC)_n) with equal volume fractions of A and compositional symmetric (BC)_nB (or (BC)_n) are investigated by using the pseudospectral method of the self-consistent mean field theory. These terpolymers can self-assemble into hierarchical lamellar phases of perpendicular or parallel lamellae within lamellae, and the number of B/C thin layers in the parallel phase can be varied. The relative stability among these hierarchical lamellar phases can be tuned by the three interaction parameters of χ_ABN, χ_ACN, and χ_BCN. Two-dimensional phase diagrams, the cross sections of the three-dimensional phase diagram, are determined in our calculations. Our conclusion that the perpendicular phase is stable only in the case of χ_ACN χ_ABN < χ_BCN is consistent with experimental observations by Bates’s group. In addition, our results suggest that the existence of the perpendicular phase is generic in both types of terpolymers: A(BC)_nB and A(BC)_n, with different values of n, even for the special case of A(BC)_n, that is, an ABC linear terpolymer.