The alkali cellulose itself is produced by the reaction of cellulose with sodium hydroxide.The step of alkali cellulose is necessary to simplify the reaction between the etherification agent and the cellulose chain.
Degree of substitution (DS) and aggregation (DP) are typical of NaCMC of each level treetop.
1 Substitution and solubility substitution degrees refer to the mean number of sodium carboxymethyl groups attached to each cellulose unit.
The Glucanan on the cellulose molecule has three alcohols: one primary alcohol and two secondary alcohols.All three alcohol groups can react with sodium chloroacetate.
The primary alcohol group was most reactive and was therefore taken The generation group first allows the double generation specific group to lengthen the reactant molecules.
The maximum value of double generation degree is 3, but in industry, the largest generation degree is 05 NaCMC between change to 1.2.The characteristics of NaCMC of 0.2 – 03 are very different from NaCMC of 0.7 – 08.The former is only partially soluble in water at PH 7, but the latter is fully soluble.
The opposite is true under alkaline conditions.
2. Polymerization and viscosity Polymerization refers to the length of the cellulose chain and determines the size of the viscosity.The longer the cellulose chain the greater the viscosity, NaCMC solution is also as this.
The NaCMC molecules exhibit a linear structure and are therefore able to form high-viscosity solutions.
The viscosity reflects the intermolecular interaction forces.
Therefore, products with different degrees of polymerization were selected to make a 1% NaCMC in water solution, with a viscosity of between a few cP and a few thousand cP at 25℃.