Synthesis, characterization and photoreaction of side‐chain liquid‐crystalline polymers and copolymers comprising alkenyloxy‐biphenyl mesogen

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書誌事項

公開日
1997-09
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/macp.1997.021980915
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>Photoreactive (meth)acrylate monomers having mesogenic groups based on 4‐hexyloxy‐4′‐(3‐methyl‐2‐butenyloxy)biphenyl and 4‐hexyloxy‐4′‐(2‐butenyloxy)biphenyl were synthesized. Methacrylate monomers (<jats:bold>3c, d</jats:bold>) and acrylate monomer having 3‐methyl‐2‐butenyloxy group (<jats:bold>3b</jats:bold>) were polymerized by free radical mechanism; the acrylate monomer having 2‐butenyloxy group (<jats:bold>3a</jats:bold>) caused gelation during the polymerization. To obtain photoreactivity, 4‐benzoylphenyl (meth)acrylates were radically copolymerized with monomers <jats:bold>3b</jats:bold> and <jats:bold>3d</jats:bold>. Thermal behavior of (co)polymers was determined by differential scanning calorimetry, polarized optical microscopy and temperature‐controlled X‐ray analysis. (Co)polymers showed liquid‐crystalline behaviour with nematic and smectic phases. UV‐irradiation was used to photochemically crosslink copolymer films, and the resultant films were insoluble in organic solvents. The uniaxially oriented copolymer thin film was photo‐crosslinked and showed thermally stable orientation.</jats:p>

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