Fully Liquid-Crystalline ABA Triblock Copolymer of Fluorinated Side-Chain Liquid-Crystalline A Block and Main-Chain Liquid-Crystalline B Block: Higher Order Structure in Bulk and Thin Film States

Ryohei Ishige, Noboru Ohta, Hiroki Ogawa, Masatoshi Tokita, Atsushi Takahara

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Fully liquid-crystalline (LC) ABA-type triblock copolymers were synthesized by atom transfer radical polymerization; the A block was a fluorinated side-chain LC polymer, PFA-C8, and the B block was a main-chain LC polyester, BB-5(3-Me). The volume fraction of the A block (ψA) was 0.11-0.70, and the B block had a constant molecular weight. Nanometer-scale segregated structures in the bulk and thin film states were investigated by synchrotron X-ray diffraction (XRD) in transmission and grazing-incidence (GI) geometries to examine the effect of competition between the LC orientation and polymer chain dimensions on the morphology. When ψA is 0.11, matching of the mesogen orientation in the A and B blocks dominates the main-chain orientation, whereas when ψA exceeds 0.28, matching of the lateral dimensions of the A and B blocks dominates the mesogen orientation, although all the polymers showed lamellar structure before isotropization of BB-5(3-Me). GI-XRD revealed that the lamellar structure in the thin film with ψA = 0.70 was completely perpendicular to the Si substrate without surface modification or solvent annealing.

Original languageEnglish
Pages (from-to)6061-6074
Number of pages14
JournalMacromolecules
Volume49
Issue number16
DOIs
Publication statusPublished - Aug 23 2016

All Science Journal Classification (ASJC) codes

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

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