Liquid crystalline side chain polysiloxanes with 4-amino-4'-stilbenecarboxylic ester mesogens

Abstract : The liquid crystalline phases of polysiloxanes have been characterized by DSC, optical microscopy, and powder X-ray diffraction. The polysiloxanes form monolayers at the air/water interface with molecular areas of 30 - 35 A(2), and the films do not collapse at pressures of about 40 mN/m. The monolayers of CPS-1 and -2 showed good stability on water compared to those of HPS-1 and -2 as measured by isobaric surface area changes as a function of time. Moreover, there was little hysteresis between isotherms obtained by compression and subsequent decompression below 40 mN/m for CPS-1 and -2.