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Preparation of ordered and crosslinked films from liquid crystalline vinyl ether monomers
Author(s) -
Andersson H.,
Sahlén F.,
Gedde U. W.,
Hult A.
Publication year - 1994
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19940770135
Subject(s) - mesogen , monomer , materials science , photopolymer , polymerization , polymer chemistry , polymer , liquid crystal , bifunctional , polyimide , vinyl ether , chemical engineering , organic chemistry , composite material , chemistry , liquid crystalline , catalysis , optoelectronics , layer (electronics) , engineering
Abstract Thermally stable ordered films were prepared by in‐situ photopolymerization of an oriented monomer mixture, consisting of mesogenic monofunctional and bifunctional vinyl ethers. Orientation was achieved by a simple surface treatment, using an unidirectionally rubbed polyimide film. The films restored their orientation when cooled down from temperatures of 200°C. Highly ordered densely crosslinked films have been prepared by polymerization of bifunctional mesogenic vinyl ether monomers. Polymerization from various monomer phases resulted in LC polymer network films with different molecular organizations. It was shown that films with nematic, smectic A and smectic B structures were obtained, the latter having a very high degree of orientation. The films were analyzed with small‐angle X‐ray scattering, polarized light microscopy and infrared‐ dichroism measurements.