期刊
CARBOHYDRATE POLYMERS
卷 87, 期 1, 页码 84-94出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2011.07.016
关键词
Cellulose; Modified-cellulose; Cotton; Esterification; Microwave; Biodegradable
资金
- Chulalongkorn University
- National Metal and Materials Technology center, National Science and Technology Development Agency [MT-B-51-POL-09-406 - G]
The esterification of cellulose from waste cotton fabric in a N,N-dimethylacetamide/lithium chloride solvent system was carried out using different types of fatty acid chloride including butyryl chloride, capryloyl chloride, and lauroyl chloride as esterifying agents, and N,N-dimethyl 1-4-aminopyridine as a catalyst under conventional and microwave activation. Microwave esterification was performed under 2.45 GHz with power varying from 90 to 450W. The optimum conditions for esterification of cotton cellulose with various esterifying agents were investigated in terms of reaction time and temperature to attain appropriate %weight increase and degree of substitution of esterified-cellulose. The degree of substitution, functional group and chemical structure, and thermal stability of cellulose ester powder were characterized by H-1 NMR, FTIR, and TGA/SDTA analysis. Morphologies, crystallinity, and solubility of modified cellulose by two different heating methods were compared. (C) 2011 Elsevier Ltd. All rights reserved.
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