Вид документа : Статья из журнала Шифр издания : 54/N 10 Автор(ы) : Pestov A. V., Skorik Yu.A., Kogan G., Yatluk Yu. G. Заглавие : N-alkylation of chitosan by beta-halopropionic acids in the presence of various acceptors Место публикации : Journal of Applied Polymer Science . - 2008. - Vol. 108, № 1. - С. 119-127 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: N-carboxyethylation of chitosan by -halopropionic acids in the presence of various proton and halogen ion acceptors was investigated. It has been observed that carboxyethylation of chitosan in aqueous medium is accompanied by the by-processes of hydrolysis and dehydrohalogenation of the -halopropionic acids yielding -hydroxypropionic acid, bis(2-carbox-yethyl) ether, and acrylic acid. Degree of carboxyethyl substitution (DS) of chitosan and the relative rates of the by-processes varied significantly depending on the conditions used and nature of the proton or halogen ion acceptor. At carboxyethylation of chitosan with the alkaline -bromopropionates, the DS increased in the order Cs+ Rb- K+ sim; Na+ Li-. Держатели документа: Центральная научная библиотека УрО РАН Доп.точки доступа: Pestov, A. V.; Skorik, Yu.A.; Kogan, G.; Yatluk, Yu. G.; Ятлук Юрий Григорьевич