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11 March 1996 X-ray mesophase investigation of a class of liquid crystalline side group polymers
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The phase behavior of liquid crystalline side group polymethacrylates with azo-chromophores in the mesogens was investigated. Layer periodicities (monolayers or bilayers) of the smectic phases depend on the spacer to tail length ratio. For the polymer where the layer periodicity changes from a monolayer to a bilayer two orthogonal smectic monolayer phases SB and SA1 are metastable. After annealing in the SB phase a crystallization occurs. On annealing in the SA1 phase a transformation into a bilayer SC2 phase takes place. An arrangement of the mesogens in the SA1 and SC2 phases is proposed assuming steric hindrance of the side groups caused by the attachment to the polymethacrylate backbone and ataractic permanent dipolar-induced dipolar forces of neighboring side groups. To prove the results also samples with different dipole moments in the mesogens (ester- and amide- instead of azo-units) and in the tail groups (fluorinated) were studied.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dietmar Wolff "X-ray mesophase investigation of a class of liquid crystalline side group polymers", Proc. SPIE 2651, Liquid Crystal Materials, Devices, and Applications IV, (11 March 1996);

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