An azobenzene mesogen-substituted diacetylene (NADA) monolayer has been transferred onto the solid substrate by the traditional Langmuir-Blodgett (LB) method. Solid-state polymerization of NADA LB films can be sensitized in visible light region. In situ UV-vis absorption measurement enables us to study polymerization kinetics of NADA LB films. The polymerization process can be described as a first order rate equation and polymerization rate constants are characterized in detail. Furthermore, achiral NADA molecules can form chiral LB films through overcrowded packing of the azobenzene moiety. (C) 2009 Elsevier B.V. All rights reserved.