New PDF release: Catalysis by Polymers

By Bekturov

ISBN-10: 3527296743

ISBN-13: 9783527296743

ISBN-10: 3527614664

ISBN-13: 9783527614660

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Extra resources for Catalysis by Polymers

Sample text

The value of A S increases for both catalyst types due to an increase in the local concentration of the substrate and desolvation of the activated complex with a high electrostatic potential of macroions. For the VAm-VAl copolymers, however, the increase in activation entropy is very moderate in comparison with the ionenes. These differencies in entropy increment may be explained by the increasing of hydrophobicity of ionene polymers when the charge density decreases and the alkyl segments get longer.

5 Interfacial Catalysis 39 within 45 h [ 1761. However, the rate of substrate oxidation considerably increases in the presence of polyethylene oxide (PEO) due to the partial solubilization of KMn04 in benzene through the formation of a soluble complex of K + with PEO. It is assumed [I751 that the selective oxidation of primary alkyl halides by potassium chromate is realized through the transfer of a chromate ion to the organic phase by PEO. It has been found [117] that polyethylene glycol (PEG) produces a strong catalytic effect during the reaction of butyl bromide with KI.

Bekturov, S. E. B. Sigitov, Polymer 27, 1269 (1986) [85] V. B. Sigitov, S. E. Kudaibergenov, E. A. Bekturov, Koord. Khim. 13, 600 (1987) [86] P. G. Meinders, G. Challa, in Polymeric Amines and Ammonium Salts. E. J. Goethals, editor Pergamon Press Oxford, New York, Toronto, Sydney, Paris, Frankfurt, 1980 [88] M. Takeishi, M. Ueda, Sh. Hayama, Makromol. , Rapid Commun. 2, 167 (1981) [89] T. Yen Bao, H. C. Pitt, Polym. Prepr. Am. Chem. 26, 81 (1985) [90] C. Carlini, C. Sbrana, J. Macromol. -Chem. 16, 323 (1981) [91] M.

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