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Studies on main ‐ chain liquid ‐ crystalline model oligomers of defined length and structure
Author(s) -
Seliger H.,
Eppel M.,
Göldner E.,
Kittel I.,
Ludwig A.,
Schorr R.
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920580118
Subject(s) - mesogen , chain (unit) , polymer , ethylene glycol , phase (matter) , sequence (biology) , polymer chemistry , oligomer , group (periodic table) , chemistry , materials science , crystallography , liquid crystalline , stereochemistry , organic chemistry , physics , biochemistry , astronomy
Oligomers of defined sequence and structure modelling main chain LC polymers were prepared a) by solution synthesis; b) by a novel liquid phase synthesis using two monomethoxy‐poly (ethylene glycol) supports. Benzyl‐ and tert.butyl‐groups were used as orthogonal pair of protecting groups for route a), and also as compatible anchor groups for carriers in route b). Depending on chain structure and end groups, at least ca. 3 mesogenic elements are required to allow for LC phase transitions. The phase behaviour of oligomers with free carboxylic ends can be explained by their association tendency.