Liquid Crystalline Compounds in the Thiophene Series, Part 12+ Synthesis and Characterization of Side Chain Polysiloxanes with Low Transition Temperatures

Gerhard Koßmehl, Bettina Labahn
1996 Zeitschrift für Naturforschung. B, A journal of chemical sciences  
Polysiloxanes as side chain polymers containing the 2.2′-bithiophene unit, hexyl and octyl terminal groups and spacer units with 3, 5. 6 and 10 methylene groups were prepared and characterized. These polymers have monotropic liquid crystalline phases with transition tem ­ peratures below 0 °C (e. g. for polymer 6p: isotropic → liquid crystalline transition: -20 °C; liquid crystalline → solid transition: -43 °C). Polymers with a trimethylene spacer group must contain an octyl terminal group for
more » ... terminal group for forming liquid crystalline phase; a hexyl group does not form such a phase.
doi:10.1515/znb-1996-0219 fatcat:f7rzg7mzsfhr7e7ixcwljy37ru