Perpendicular lamellar-in-lamellar and other planar morphologies in A-b-(B-b-A)2-b-C and (B-b-A)2-b-C ternary multiblock copolymer meltsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 26 апреля 2016 г.
Аннотация:Ordered planar morphologies in A-b-(B-b-A)2-b-C and (B-b-A)2-b-C terpolymer melts are studied
within the framework of the self-consistent field theory for volume fractions of components A, B,
and C in the ratio 1:1:2 and the Flory-Huggins interaction parameters satisfying χAB = 2χAC. The
stable phases turn out to be the disordered, hexagonal, parallel lamellar-in-lamellar L (including the
simple lamellar) as well as non-shifted and shifted (L⊥ and SL⊥) perpendicular lamellar-in-lamellar
morphologies. Depending on the value of the ratio r = AB/BC, where is a characteristic temperature
of the units involved, different sequences of phase transitions are shown to occur. The hexagonal
phase is characteristic for r∼=1. The L⊥ and SL⊥ morphologies occur at weak and intermediate segregations whereas the L morphology appears for stronger degrees of segregation. For (B-b-A)2-b-C
a reduction in r favors the shifted SL⊥ phase over the non-shifted L⊥ one, whereas for A-b-(B-b-
A)2-b-C we find re-entrant phase transitions SL⊥ − L⊥. The physics determining the particular phase
behavior is discussed.