کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1384790 982418 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rapid esterification of wheat straw hemicelluloses induced by microwave irradiation
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Rapid esterification of wheat straw hemicelluloses induced by microwave irradiation
چکیده انگلیسی

Esterification of wheat straw hemicelluloses with acetyl chloride, propionyl chloride, n-octanoyl chloride, lauroyl chloride, palmitoyl chloride, stearoyl chloride, and oleoyl chloride, respectively, using N-bromosuccinimide (NBS) as a catalyst was achieved in DMF/LICl medium by microwave irradiation. The effects of various acyl chlorides and the molar ratios of xylose units in hemicelluloses/acyl chloride on the degree of substitution (DS) were investigated and DS reached up to 1.34 by a few minutes. 13C NMR studies showed that the esterification occurred preferentially at the C-3 and C-2 positions. On the other hand, microwave irradiation brought a partial degradation of the polymer, and therefore resulted in a slight decrease in thermal stability of the hemicellulosic derivatives in comparison with conventional heating technique.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 73, Issue 4, 5 September 2008, Pages 612–620
نویسندگان
, , , , , , ,