Abstract
The conditions for low and highly substituted water-soluble carboxymethyl cellulose synthesis based on microcrystalline and powder cellulose by the suspension method have been investigated. Accordingly, it was obtained CMC water-soluble samples with 0.38-0.40 substitution degree based on microcrystalline and powder cellulose. And at one stage, there were obtained CMC samples with a high degree of substitution (1.4) by carboxymethylation so called polyanionic cellulose.
Highlights
IntroductionCarboxymethyl cellulose (CMC) is an alkaline cellulose interaction product with monochloracetic acid or its sodium salt [1,2,3,4,5]
Carboxymethyl cellulose (CMC) is an alkaline cellulose interaction product with monochloracetic acid or its sodium salt [1,2,3,4,5].The CMC production from cellulose includes two stages chemical reactions [6,7]
We have investigated obtaining low- and highly-substituted water-soluble CMC possibilities samples based on microcrystalline cellulose (MCC) and powdered cellulose (PC) by the suspension method
Summary
Carboxymethyl cellulose (CMC) is an alkaline cellulose interaction product with monochloracetic acid or its sodium salt [1,2,3,4,5]. The CMC production from cellulose includes two stages chemical reactions [6,7]. Production technology type, CMC is produced on an industrial scale, which degree of substitution. The currently produced CMC has above DS=0.6 and DP=400 [8,9]. Depending on carboxymethyl group number, CMC grades are subdivided into low (≥0,5), medium (0,55–0,85) and highly substituted (≤0,9) grades. The CMC samples with more than 0,9 substitution degree are called polyanionic cellulose [10,11,12]. Traditional CMC acquires the ability to dissolve in water with above DS = 0,5 substitution degree
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