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 grafted with dextrin (CMC-g-dextrin) products are easily accessible by reacting freshly prepared CMC with the acid alcoholysis product from starch and glycerol monochlorohydrin. The success of the grafting reaction depends on adjusting the alkalinity of the grafting reaction mass prior to addition of the dextrin chlorohydrin reagent. In all, less NaOH should be applied than theoretically necessary for all chlorine substitution. In some cases the products show interesting rheology at very low shear, but rather CMC-like rheology or more Newtonian behavior than CMC at shearing rates over a few reciprocal seconds. These results reinforce the credibility of the view that natural polysaccharide gums with unusual rheologies derive their special properties from their well-defined substitution pattern rather than from their overall degree of substitution with (oligo)saccharide units.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1985.070300901
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