Abstract
The thermal stability of the Langmuir-Blodgett (LB) films of icosanoic acid and cadmium icosanoate was studied using Fourier transform IR reflection absorption spectroscopy and scanning electron microscopy. It was found that the thermal behaviour of icosanoic acid in LB films is quite different from that of cadmium icosanoate. For the icosanoic acid LB film, the fast progressive disordering with the desorption and migration of the acid molecules occurs with increasing temperature even below the bulk melting point, while for the cadmium icosanoate LB film the desorption and migration were hardly observed at temperatures below and around the bulk melting point. From the thermal cyclic experiments, it was found that the structural change of the LB film on heating was irreversible for icosanoic acid and was reversible for cadmium icosanoate in the temperature range below the bulk melting point.
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