Synthesis and catalytic properties of hydrophobically modified poly(alkylmethyldiallylammonium bromides)
摘要:
A series of hydrophobically modified homo- and copolymers of the poly(alkylmethyldiallylammonium bromide) type has been prepared by free-radical cyclo(co)polymerization of alkylmethyldiallylammonium bromide monomers in aqueous solution. Depending on the length of the alkyl side chain (varied between C1 and C-12) and the conformational freedom of the polymeric main chain, polysoap behavior was found as indicated by the hypsochromic shift of the long-wavelength absorption band of Methyl Orange, noncovalently bound to the macromolecule. The formation of a compact coil results in the presence of hydrophobic microdomains. Polysoap formation, akin to intramolecular micellization, is also revealed by appreciable catalytic effects on the unimolecular decarboxylation of 6-nitrobenzisoxazole-3-carboxylate at pH 11.3 and 30-degrees-C.