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First observation of a columnar mesophase in a carborane‐containing main‐chain semiflexible copolymer
Author(s) -
Antipov Evgueni M.,
Vasnev Valeri A.,
Stamm Manfred,
Fischer Erhard W.,
Platé Nikolai A.
Publication year - 1999
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19990401)20:4<185::aid-marc185>3.0.co;2-j
Subject(s) - mesophase , copolymer , carborane , mesogen , materials science , sebacic acid , polymer chemistry , polymer , phase (matter) , side chain , crystallography , liquid crystal , liquid crystalline , organic chemistry , chemistry , composite material , optoelectronics
A comparison of the structure and phase composition of a recently synthesized carborane‐containing copolymer and its wholly organic analogue was carried out by DSC and X‐ray analysis in a wide temperature range between 20–300°C. It is found that the incorporation of 10 mol‐% of m ‐carboranedicarboxylic units in the polymer prepared from 4,4′‐dihydroxybiphenyl and sebacic acid, acting as mesogen and flexible spacer, respectively, leads to the formation of a columnar mesophase at elevated temperatures. This newly observed phase occurs in addition to the crystalline and liquid crystalline smectic phases known for the wholly organic analogue.