Confinement-induced novel morphologies of block copolymers.
作者： Bin Yu , Pingchuan Sun , Tiehong Chen , Qinghua Jin , Datong Ding
DOI: 10.1103/PHYSREVLETT.96.138306
关键词: Degree (graph theory) 、 Toroid 、 Nanopore 、 SPHERES 、 Copolymer 、 Pore diameter 、 Period (periodic table) 、 Chemical physics 、 Materials science 、 Frustration
摘要: Self-assembly of block copolymers confined in cylindrical nanopores is studied systematically using a simulated annealing technique. For diblock which form two-dimensional hexagonally packed cylinders with period ${L}_{0}$ the bulk, novel structures such as helices and stacked toroids spontaneously inside pores. These confinement-induced morphologies have no counterpart bulk system they depend on pore diameter ($D$) surface-polymer interactions, reflecting importance structural frustration interfacial interactions. On tightening degree confinement, transitions from to spheres are observed. Mechanisms morphological can be understood based parametrized by ratio $D/{L}_{0}$.
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