First observation of a columnar mesophase in a carborane‐containing main‐chain semiflexible copolymer |
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Authors: | Evgueni M. Antipov,Valeri A. Vasnev,Manfred Stamm,Erhard W. Fischer,Nikolai A. Platé |
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Abstract: | 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. |
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