O. Francescangeli et al., X-RAY-DIFFRACTION STUDY OF THE SMECTIC-C MESOPHASE OF A SIDE-CHAIN POLYACRYLATE CONTAINING A SULFIDE SUBSTITUTED MESOGEN, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 254, 1994, pp. 321-333
An X-ray study was performed on powder specimen and oriented fibers of
a side chain liquid-crystalline polyacrylate containing a sulfide sub
stituent. The X-ray diffraction patterns showed the presence of a bila
yer smectic C mesophase with the mesogenic groups tilted by an angle b
eta approximate to 40 degrees with respect to the layer normal. The el
ectron density profile rho(z) along the direction normal to the smecti
c layers was calculated by Fourier inversion and the results suggest a
minor interdigitation of the aliphatic chains. The positional smectic
order parameter was also determined.