کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7793545 | 1500659 | 2014 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Quaternized and sulfated xylan derivative films
ترجمه فارسی عنوان
فیلم های مشتق شده از جنس کوارتنیزه و سولفات شده
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
Xylan quaternized sulfate films were prepared from beech xylan (X) and compared with fully sulfated xylan films (XS). When quaternized xylan (QX) was prepared in the first step (DSQÂ =Â 0.55), than by sulfation of QX in the second step the fully substituted ampholytic derivative (QXS; DSQÂ =Â 0.33; DSSÂ =Â 1.67) could be obtained. By sulfation in first step, xylan sulphate (SX, DSSÂ =Â 0.70) was obtained and by subsequent quaternization, SXQ film with DSQÂ =Â 0.55 and DSSÂ =Â 0.33 which contained partially unsubstituted hydroxyls. The molar masses (Mn) of the film's soluble parts were increasing in order XÂ <Â SXÂ <Â SXQÂ <Â QXÂ <Â XSÂ <Â QXS. In all films there were some insoluble particles present as determined by the amount of recovered masses by SEC-MALS. The materials were further characterized by AFM, XRD, TG/DTG/DTA, NMR and mechanical testing. QXS and SXQ could form mechanically more stable films than XS specimens.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 99, 2 January 2014, Pages 356-364
Journal: Carbohydrate Polymers - Volume 99, 2 January 2014, Pages 356-364
نویسندگان
Ivan Å imkovic, Adam Tracz, Ivan Kelnar, Iveta Uhliariková, Raniero Mendichi,