ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
A method of preparing sodium cellulosates by an exchange reaction between cellulose and sodium alkoxide in alcohol medium is proposed. Anhydrous systems of sodium methoxide in methanol and sodium n-butoxide in n-butanol were used to treat cotton and viscose rayon celluloses to form sodium alcoholates of cellulose. It is shown that alcohols used as extraction solvents in the purification of the reaction products must be of low acidity, such as branched chain alcohols, since straight chain alcohols of relatively high acidity are shown to cause destruction of the sodio derivatives. The distribution of sodium in the products was found indirectly by methylating the sodio derivatives in pure methyl iodide and determining the distribution of methoxyl groups by paper chromatographic techniques. It was indicated that the sodium substituent was distributed in the various sodium cellulosates in a somewhat random arrangement. Glucose, mono-O-methyl glucose, di-O-methyl glucose, and tri-O-methyl glucose constituted the distribution products. The mono-O-methyl glucose fractions were further separated, to disclose the presence of the 2,3, and 6 isomers. The degree of substitution (DS) found for the sodium cellulosates ranged from 0.52 to 1.72.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1961.1205115511
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