The polymerization of epsilon-caprolactam between the interlamellar spaces of the [TEACOOH]-montmorillonite intercalations complex was attempted using Na-montmorillonite and 10-carboxy-n-decyltriethylammonium bromide to achieve [TEACOOH]-polycaprolactam-montmorillonite, in which montmorillonite (inorganic polymer) is chemically bonded with the polycaprolactam (organic polymer). The results of X-ray and IR analysis for the samples obtained after polymerization showed that the polymerization reaction has been successfully accomplished. For the purpose of studying the polymeric reaction product more precisely, we have isolated the polymerized product from the silicate layers and analyzed it with X-ray diffractometer and IR spectrometer. Comparison of the results of X-ray and IR analysis between the isolated polymer and the polymer that was synthesized by the reaction of epsilon-caprolactam only with the organic cation without montmorillonite showed that both obtained polymers are the same compounds. (C) 2003 Wiley Periodicals, Inc.