Effect of Polymer Nature on the Structure and Properties
of Gel Composites with Incorporated Bentonite Particles

E. K. Lavrent’eva^a, S. G. Starodubtsev^a, A. R. Khokhlov^a, V. V. Volkov^b, and K. A. Dembo^b

^a Department of Physics, Moscow State University, Leninskie gory, Moscow, 119992 Russia

^b Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333 Russia

Received October 23, 2007

Abstract—Composite gels based on polyacrylamide and poly(N-isopropyl acrylamide) with incorporated
sodium bentonite particles are synthesized. It is shown that the presence of hydrophobic isopropyl groups in a
polymer molecule promotes the subsequent formation of highly ordered aggregates of clay and cetylpyridinium
chloride in a gel composite. An increase in temperature results in the collapse of composite gels based on
poly(N-isopropyl acrylamide); however, no marked changes in the structure of lamellar aggregates of clay and
surfactant are observed. It is revealed that the gel can stabilize lamellar structures formed in organoclay suspen-
sion prior to the incorporation into swollen polymer network.

DOI: 10.1134/S1061933X08050098

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