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Monomolecular layers of methyl methacrylate adsorbed on surface of sodium montmorillonite clay were prepared by saturation of clay with monomer, followed by desorption of excess monomer by means of repeated washing with nonpolar hydrocarbons; polymerization of these monolayers was initiated with γ-ray irradiation by free radical catalysts; doses of γ-rays and concentration of free radical catalysts required to initiate polymerization are much higher than for polymerization of methyl methacrylate in bulk; X-ray data show that its segments are oriented horizontally (lying flat) on surface; thermal degradation of inserted polymer and weight loss upon calcination at 1000 C were determined.