A series of new poly(bisma1eimide-diamine)s (3 ac) with crown-ether groups in the main chain were synthesized from bismaleimides (1 a-c) and a diamino-functional dibenzo-18-crown-6 (2). The polymerization occurred in solution through the addition of the NH, groups of 2 to the C = C double bonds of the maleimide rings of 1. The optimum polymerization conditions were established. The polymers 3 were obtained in good yields and fairly high molecular weights (qred = 0,15-0,35 dL/g). The polymeric crown ethers show high capacity for the binding of alkali metal ions and may be used as selective sorbents.

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This article presents the results of a study of cleaning the water surface from contamination with petroleum products. Kulantaussky vermiculite, the birthplace of the Turkestan region, was studied as a sorbent. Studies have shown that the modified vermiculite is able to retain the sorbed oil up to 2 days after the expiration of the main sorption time (4 hours). It is established that the oil capacity depends on the thickness of the oil film, the sorption time and the amount of the sorbent taken.

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