Stearoylation of hemicelluloses from wheat straw

Stearoylated hemicelluloses with degrees of substitution 0.20–1.71 were prepared by a rapid reaction of wheat straw hemicelluloses with stearoyl chloride using 4-dimethylaminopyridine as catalyst and triethylamine as acid acceptor in a homogeneous N, N-dimethylformamide and lithium chloride system....

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Bibliographic Details
Published in:Polymer degradation and stability 2000-02, Vol.67 (2), p.345-353
Main Authors: Sun, RunCang, Fang, J.M, Tomkinson, J
Format: Article
Language:English
Subjects:
Applied sciences
Cellulose and derivatives
Exact sciences and technology
Natural polymers
Physicochemistry of polymers
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Summary:Stearoylated hemicelluloses with degrees of substitution 0.20–1.71 were prepared by a rapid reaction of wheat straw hemicelluloses with stearoyl chloride using 4-dimethylaminopyridine as catalyst and triethylamine as acid acceptor in a homogeneous N, N-dimethylformamide and lithium chloride system. Under optimum conditions approximately 92% of the free hydroxyl groups in native hemicelluloses were stearoylated in 30 min at 75°C. Molecular weight measurements showed only minimal degradation (⩽8%) of hemicellulosic chains during the rapid reactions at 75°C for 10–35 min, while a noticeable degradation (∼20%) of the stearoylated hemicelluloses was observed during the reaction at 85°C. Differential thermal analysis studies revealed an increase of the thermal stability of the stearoylated hemicelluloses.
ISSN:0141-3910
1873-2321
DOI:10.1016/S0141-3910(99)00136-6