Orientation of microphase-segregated cylinders in liquid crystalline diblock copolymer by magnetic field

N Tomikawa, Z B Lu, T Itoh, C T Imrie, M Adachi, M Tokita, J Watanabe

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

This paper reports the first successful preparation of perfectly aligned cylindrical microdomains in liquid crystal (LC) diblock copolymer, polystyrene-block-poly-LC with a poly-LC composition of 84%, by application of a magnetic field. The prerequisite for their alignment is the exhibition of order-disorder transition of the microdomain structure. When the poly-LC segments transform from the isotropic phase to the nematic, well-defined microcylinders are concurrently formed from the weakly segregating state, and their alignment along the magnetic field is realized through the magnetic alignment of LC mesogens.

Original languageEnglish
Number of pages4
JournalJapanese Journal of Applied Physics. Part 2, Letters
Volume44
DOIs
Publication statusPublished - 2005

Keywords

  • side-chain liquid crystalline polymer
  • block copolymer
  • magnetic alignment
  • nematic phase
  • microphase separation
  • cylindrical microdomain
  • LIVING ANIONIC-POLYMERIZATION
  • THERMOTROPIC PHASE-BEHAVIOR
  • WELL-DEFINED STRUCTURES
  • BLOCK-COPOLYMERS
  • CONFORMATION
  • HOMOPOLYMERS
  • MORPHOLOGY
  • POLYMERS

Cite this

Orientation of microphase-segregated cylinders in liquid crystalline diblock copolymer by magnetic field. / Tomikawa, N ; Lu, Z B ; Itoh, T ; Imrie, C T ; Adachi, M ; Tokita, M ; Watanabe, J .

In: Japanese Journal of Applied Physics. Part 2, Letters, Vol. 44, 2005.

Research output: Contribution to journalArticle

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AU - Tomikawa, N

AU - Lu, Z B

AU - Itoh, T

AU - Imrie, C T

AU - Adachi, M

AU - Tokita, M

AU - Watanabe, J

PY - 2005

Y1 - 2005

N2 - This paper reports the first successful preparation of perfectly aligned cylindrical microdomains in liquid crystal (LC) diblock copolymer, polystyrene-block-poly-LC with a poly-LC composition of 84%, by application of a magnetic field. The prerequisite for their alignment is the exhibition of order-disorder transition of the microdomain structure. When the poly-LC segments transform from the isotropic phase to the nematic, well-defined microcylinders are concurrently formed from the weakly segregating state, and their alignment along the magnetic field is realized through the magnetic alignment of LC mesogens.

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KW - side-chain liquid crystalline polymer

KW - block copolymer

KW - magnetic alignment

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KW - microphase separation

KW - cylindrical microdomain

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