Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10603181 | Carbohydrate Polymers | 2005 | 9 Pages |
Abstract
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.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Daiyong Ye, Daniel Montané, Xavier Farriol,