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Modifications of cellulose derivatives and study of their applications


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Год выпуска: 2012
Автор: El-Refaie Kenawy,Amany El-Khouly and Ahmed Safaan
Издательство: LAP Lambert Academic Publishing
Страниц: 248
ISBN: 9783659117503
Описание
 Graft polymerization of acrylonitrile onto cellulose fiber initiated by KMnO4/citric acid in aqueous solution was examined and the grafted copolymers were characterized by using NMR, FT-IR, XRD, TG and DSC. Graft yield, GY, obtained by simple weighting method was close to the value obtained by NMR analysis. The most efficient condition was obtained. Also, Graft polymerization of acrylonitrile onto cellulose fiber initiated by KMnO4/different acid in aqueous solution was examined and mechanical properties grafted samples are tested by simple elongation. It was found that the mechanical properties become more poor when strong acids are used, indicating that more chain rupture. After these studies, the grafted cellulose was chemically modified to use in different applied fields. Amidoximated grafted cellulose was obtained by reaction hydroxylamine and cellulose-graft-polyacrylonitrile. The highest value of amidoxime content was 2.42 mmol/g and The adsorption efficiencies of amidoximated...

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Галина, 19.01
Юля,здравствуйте! Курсовые работы защитили на 5. Спасибо Вам огромное! Правда гоняли как бобиков- пришлось выкручиваться кто как мог!