Log-Rolling Block Copolymer Cylinders

Ye Chan Kim, Dong Hyup Kim, Se Hun Joo, Na Kyung Kwon, Tae Joo Shin, Richard A. Register, Sang Kyu Kwak, So Youn Kim

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Shear is an effective method to create long-range order in micro- or nanostructured soft materials. When simple shear flow is applied, particles or polymer microdomains tend to align in the shear direction to minimize viscous dissipation; thus, transverse alignment (so-called log-rolling) is not typically favored. This is the first study to report the transverse alignment of cylinder-forming coil-coil block copolymers. Poly(styrene-b-methyl methacrylate), PS-PMMA, where the PS blocks form the matrix, can adopt a metastable PMMA hemicylindrical structure when confined in a thin film, and this hemicylindrical structure can orient either along the shear direction or transverse to the shear direction depending on the shearing temperature. A monolayer of PS-PMMA forming full cylinders exhibits log-rolling alignment. This unusual log-rolling behavior is explained by the low chain mobility of the cylinder-forming PMMA block at low temperatures, which is the critical quantity determining the direction of shear alignment.

Original languageEnglish (US)
Pages (from-to)3607-3616
Number of pages10
JournalMacromolecules
Volume50
Issue number9
DOIs
StatePublished - May 9 2017

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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