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- W1952007002 abstract "The synthesis, characterization and liquid-crystalline (LC) properties of polysiloxanes containing side chains with terminal 2-fluorenyl groups and various lengths of spacers is reported. The polymers which have no flexible tail segment exhibit two smectic mesophases (SA and SE), as confirmed by polarizing microscopy, differential scanning calorimetry (DSC) and X-ray investigations; a nematic mesophase was not found. The clearing temperatures of the polymers (in the range between 120 and 170°C) are generally 70–80°C higher than the melting temperatures of the non-liquid-crystalline precursors with a terminal vinyl group. With increasing spacer length the less ordered SA phase is favoured and has been found in a temperature range of up to 100 K width. For polymers with an SE phase no glass transition was detectable with DSC. The synthesized polymers are examples of the strong potential of the fluorene core to form LC phases without further structural stabilization." @default.
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- W1952007002 date "1992-07-01" @default.
- W1952007002 modified "2023-09-25" @default.
- W1952007002 doi "https://doi.org/10.1002/macp.1992.021930719" @default.
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