Evidence is given for solid‐state polycondensation reactions in octadecyl urea multilayers, built up by the Langmuir‐Blodgett method. The disappearance and infrared frequency modifications of characteristic functional groups are followed by spectroscopy in transmitted and reflected light and in ATR. The crosslinked polymer thus obtained on a solid substrate is compared with the polymer obtained at the liquid‐air interface. The chemical reactions are accompanied by molecular reorientation phenomena in multilayers.
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Rosilio et al. (1975) studied this question.
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