Thin Solid Films, Vol.284-285, 271-274, 1996
Self-Ordering in Ultrathin Films of Side-Chain Liquid-Crystalline Polymer
We studied surface-imposed structural peculiarities of ultrathin (2-100 nm) liquid-crystalline polymer films. The polymer investigated was based on the methylmethacrylate backbone and had mesogenic nitrostylbene side groups. The films were prepared mainly by Langmuir-Blodgett (LB) deposition and a controllable substrate removal from the polymer solution (CSR). Structural parameters of the films, including their thickness, inner periodicity and roughness were estimated by X-ray scattering, atomic force microscopy and ellipsometry. The observed 1.6 nm thickness increment per added layer for both LB and CSR films is consistent with the dipole mesogenic group arrangement for this polymer in the bulk state. The formation of layered smectic-type structure and the self-ordering in the system are discussed in comparison with other preparation techniques.