Citation: Bin Zhao, Meijiao Liu, Chao Wang, Yingcai Chen and Yuci Xu. Enlarged Stable Phase Regime of Hybrid Lamella–Sphere Phase Enabled by A1B1A2(B2)m Branched Tetrablock Copolymer[J]. Chinese J. Polym. Sci. doi: 10.1007/s10118-021-2554-7 shu

Enlarged Stable Phase Regime of Hybrid Lamella–Sphere Phase Enabled by A1B1A2(B2)m Branched Tetrablock Copolymer

  • Received Date: 2020-11-30

  • Hybrid nanostructures show a great potential application in advanced nanotechnologies due to the anisotropic properties from different nanophases. Before, our previous work demonstrates that a linear A1B1A2B2 tetrablock copolymer of symmetric overall volume fraction can self-assemble into a hybrid lamella-sphere (LS) structure by tuning the relative length of the two A- blocks through self-consistent field theory(SCFT), where the spherical and the lamellar domains are mainly composed of the long A1- and short A2- blocks, respectively. However, the phase region of LS is limited. Aiming to expand the stable region of LS, we change the linear A1B1A2B2 copolymer to a branched A1B1A2(B2)m copolymer in order to increase the local spontaneous curvature between A2- and B2- blocks. We examine the impact of the branching number m of B2- block on the stable region of LS in the phase diagram with respect to fA1 and N for fixed fB = 0.5 and fB1 = 0.26, we find that m = 2 expands the LS region significantly in contrast to the linear architecture. While the stability window of LS does not change notably when m = 2 is increased to 3 in our calculated parameter space.
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