Novel cellulosic ethers with low degrees of substitution—II. Magic angle spinning NMR study

Magic angle spinning and cross polarisation magic angle spinning solid state 13C NMR were used to study cellulose ethers with low degrees of substitution prepared in alkaline suspension using 1-iodo- or 1-bromoalkane as the alkylating reagent, and also the parent cellulose. The spectra, recorded und...

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Bibliographic Details
Published inCarbohydrate polymers Vol. 40; no. 2; pp. 125 - 135
Main Authors Torri, G, Cosentino, C, Delben, F, Simonutti, R, Sozzani, P
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.10.1999
Elsevier Science
Subjects
Applied sciences
Cellulose
Cellulose and derivatives
Degree of substitution
Exact sciences and technology
Magic angle spinning
Modified celluloses
Natural polymers
Physicochemistry of polymers
Modified celluloses
Degree of substitution
Magic angle spinning
Cellulose
Chemical modification
Crystal form
Bromocarbon
Basic medium
Crystallinity
Experimental study
Iodocarbon
Intramolecular mobility
Alkylation
Cellulose ether
Heterogeneous reaction
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Summary:Magic angle spinning and cross polarisation magic angle spinning solid state 13C NMR were used to study cellulose ethers with low degrees of substitution prepared in alkaline suspension using 1-iodo- or 1-bromoalkane as the alkylating reagent, and also the parent cellulose. The spectra, recorded under high resolution conditions, revealed both the amount and the type of crystallinity in the carbohydrate and aliphatic sequences. The cellulose crystallinity appeared to be modified more by the length of the alkaline treatment and the presence of water in the solid than by the number of side chains. The relaxation time measurements clearly revealed alkyl chain interactions and gave a rough indication of the dimension of the homogeneous hydrocarbon phase domains.
ISSN:0144-8617
1879-1344
DOI:10.1016/S0144-8617(99)00049-1