کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10603181 | 982468 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation and characterisation of methylcelluloses from Miscanthus sinensis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Preparation and characterisation of methylcelluloses from Miscanthus sinensis Preparation and characterisation of methylcelluloses from Miscanthus sinensis](/preview/png/10603181.png)
چکیده انگلیسی
Methylcelluloses were prepared and characterised from Miscanthus sinensis (elephant grass). M. sinensis pulps were prepared by impregnation rapid steam pulping process (IRSP) and bleached by a total chloride free (TCF) sequence using hydrogen peroxide. Aldrich α-cellulose was used as a model material to find a suitable methylation method for bleached pulps. The methylcelluloses were synthesised via double methylation with iodomethane in isopropanol slurry at 60 °C for 22 h. The supramolecular substitution patterns were determined by 13C nuclear magnetic resonance (NMR) spectroscopy and the intrinsic viscosities were measured in 4% NaOH solution. The rheological properties were measured in either dimethyl sulphoxide (DMSO) or 4% NaOH solution and were similar to commercial methylcelluloses in distilled water. Water-soluble and alkali-soluble methylcellulose yields were determined by solvent extraction. This investigation helped to find the proper conditions for methylating bleached pulps prepared from M. sinensis and showed that high-quality methylcelluloses can be prepared from M. sinensis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 62, Issue 3, 1 December 2005, Pages 258-266
Journal: Carbohydrate Polymers - Volume 62, Issue 3, 1 December 2005, Pages 258-266
نویسندگان
Daiyong Ye, Daniel Montané, Xavier Farriol,