Synthesis and characterization of liquid crystalline polyacrylates and non-liquid crystalline polypyrroles from bifunctional monomers

✍ Scribed by Kyu-Sik Kim; Takashi Kato; Toshiyuki Uryu

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 506 KB
• Volume: 37
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19991101)37:21<3877::aid-pola1>3.0.co;2-i

✦ Synopsis

Two kinds of polymerizations of liquid-crystalline N-{{W- {4-[4-(11acryloyloxy)undecanoxybenzoyl]biphenyleneoxy}alkyl}}pyrrole gave a side-chain liquidcrystalline polyacrylate containing pyrrole group and a non-liquid crystalline polypyrrole containing acrylate group. Liquid crystallinity was determined by DSC and optical polarizing microscope measurements. The monomers having hexyl or decyl group as the alkyl group exhibited an undefined smectic, smectic B, and smectic A phases on the heating stage. The radically polymerized polyacrylate derivatives containing the pyrrole group showed smectic A, smectic C, and undefined smectic phases on the cooling stage. On the other hand, soluble N-substituted polypyrrole derivatives containing the terminal acrylate group which were prepared by chemical oxidative polymerization by ferric chloride catalyst did not show liquid crystallinity. Structure analysis of the polypyrroles performed by 1 H and 13 C-NMR and FT-IR spectroscopies demonstrated that the polymerization occurred at the pyrrole ring.