Locally Favored Two-Dimensional Structures of Block Copolymer Melts on Nonneutral Surfaces

Mani Sen, Naisheng Jiang, Maya K. Endoh, Tadanori Koga, Alexander Ribbe, Atikur Rahman, Daisuke Kawaguchi, Keiji Tanaka, Detlef M. Smilgies

    研究成果: Contribution to journalArticle査読

    10 被引用数 (Scopus)

    抄録

    Self-assembly of block copolymers (BCPs) into arrays of well-defined nanoscopic structures has attracted extensive academic and industrial interests over the past several decades. In contrast to the bulk where phase behavior is controlled by the segmental interaction parameter, the total number of segments in BCPs and volume fraction, the morphologies and orientations of BCP thin films can also be strongly influenced by the substrate surface energy/chemistry effect (considered as a "substrate field"). Here, we report the formation of locally favored structures where all constituent blocks coexist side-by-side on nonneutral solid surfaces irrespective of their chain architectures, microdomain structures, and interfacial energetics. The experimental results using a suite of surface-sensitive techniques intriguingly demonstrate that individual preferred blocks and nonpreferred blocks lie flat on the substrate surface and form a two-dimensional percolating network structure as a whole. The large numbers of solid-segment contacts, which overcome a loss in the conformational entropy of the polymer chains, prevent the structure relaxing to its equilibrium state (i.e., forming microdomain structures) even in a (good) solvent atmosphere. Our results provide direct experimental evidence of the long-lived, nonequilibrium structures of BCPs and may point to a new perspective on the self-assembly of BCP melts in contact with impenetrable solids.

    本文言語英語
    ページ(範囲)520-528
    ページ数9
    ジャーナルMacromolecules
    51
    2
    DOI
    出版ステータス出版済み - 1 23 2018

    All Science Journal Classification (ASJC) codes

    • 有機化学
    • ポリマーおよびプラスチック
    • 無機化学
    • 材料化学

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