ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Carboxymethyl cellulose was synthesized in two-phase medium containing benzene, ethanol, and water. The distribution of substitution of hydroxyl group attached to Ck Carbons (k = 2, 3, and 6) in an anhydroglucose unit (AGU) was determined by 1H-NMR method. It showed that the sequence of distribution of carboxymethyl group of the products in AGU was C6 〉 C2 〉 C3; and when degree of substitution (DS) was low to 1.0, the approximate value of C2: C3: C6 was 1.45: 1: 2.15. When DS was higher than 1.0 and increased, the distribution of substitution tends to identical. Through analysis of X-ray diffraction and calculation of crystallinity and interplanar distance of CMC, the principle of distribution of the substituent had been explained. The influence of benzene on distribution of substituent of CMC was also investigated. It was found that distribution of substituent of CMC prepared in medium benzene-ethanol at C6 position was higher than that prepared in ethanol. © 1996 John Wiley & Sons, Inc.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
Permalink
