Preparation of High-Density Polymer Brushes with a Multihelical Structure

Tomoki Kato, Masanao Sato, Hitoshi Shimamoto, Kiyu Uno, Kazutoshi Yokomachi, Yuko Konishi, Kazutaka Kamitani, Maiko Nishibori, Noboru Ohta, Ryohei Ishige, Kevin L. White, Nobuyuki Otozawa, Tomoyasu Hirai, Atsushi Takahara

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

It is well-known that a mixture of isotactic and syndiotactic polymethyl methacrylate (PMMA) forms a stereocomplex consisting of a multihelical structure in which an isotactic chain is surrounded by a syndiotactic chain. Here, we report the basic structure of the stereocomplex formed when the syndiotactic PMMA chains are tethered to a silicon substrate and form a high-density polymer brush. The influence of geometric confinement was investigated by preparing the high-density polymer brushes on a flat and spherical substrate. In both cases, mixing the untethered isotactic PMMA with the grafted syndiotactic PMMA led to the formation of a stereocomplex with a multihelical structure. Static contact angle measurements showed a hindered surface mobility at the outermost surface of the polymer brush, indicating that the stereocomplex forms a crystalline structure. A syndiotactic polymer brush with substituted fluoroalkyl groups was prepared to increase the contrast for grazing incidence wide-angle X-ray diffraction (GIWAXD) measurements. The GIWAXD results verified that the stereocomplex forms a crystalline structure oriented perpendicular to the substrate with a relatively low degree of orientation.

Original languageEnglish
Pages (from-to)3283-3288
Number of pages6
JournalLangmuir
Volume34
Issue number10
DOIs
Publication statusPublished - Mar 13 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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