Premium
Liquid crystal thermosets from mesogenic isocyanates and epoxides
Author(s) -
Mormann Werner,
Irle Christoph
Publication year - 1997
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.19971220125
Subject(s) - mesophase , mesogen , materials science , thermosetting polymer , liquid crystal , moiety , copolymer , polymer chemistry , yield (engineering) , organic chemistry , polymer , chemistry , liquid crystalline , composite material , optoelectronics
Liquid crystal thermosets from mesogenic diisocyanates are described. Aromatic diisocyanates having the functional groups directly attached to the aromatic rings form isotropic thermosets with incomplete conversion due to crystallisation. Diisocyanates with flexible spacers and copolymers with mesogenic diepoxides have been synthesised and polymerised to overcome the geometrical restrictions which prevent the formation of a mesophase. The oxazolidinone moiety stabilizes a mesophase which was demonstrated with model compounds. Both approaches yield liquid crystal thermosets. The influence of the structure of the comonomers on the mesophase stability of isocyanurate/oxazolidinone networks was investigated.