Sodium carboxymethyl cellulose principles

Physical

Sodium methylene cellulose (CMC) is an anioncellcellulose ether,which has a white or yellow floc fiber powder or white powder, odorless andodorless and non-toxic, and is soluble in cold or hot water to form atransparent solution with a certain viscosity. The solution is neutral orslightly alkaline, insoluble in ethanol, ether, isopropyl alcohol, acetone andother organic solvents, soluble in water-containing 60% ethanol or acetonesolution.

There is moisture absorption, the light heat is stable, theviscosity decreases with the temperature, the solution is stable at the pHvalue of 2 to 10, the PH is less than 2, there is solid precipitation, the pHvalue is higher than 10 viscosity decreases. The discoloration temperature is227 degrees C, the carbonization temperature is 252 degrees C, and the surfacetension of 2% aqueous solution is 71mn/n.

Chemical properties

Cellulose derivatives that are replaced by methyl hydrochloride,which are treated with sodium hydroxide to form alkali cellulose, which is thenreacted with chlorpyraceic acid. The glucose unit that makes up cellulose has 3hydroxyls that can be replaced, so different displacement sourproducts can beobtained. On average, 1mmol mmol mmomethyl is imported in water and diluteacid, but can be puffed and used for ion exchange tomography.

MethylpKa is a weak acidic cation exchanger, usually used above pH4 for theseparation of neutral and alkaline proteins, in pure water and 3.5 in 0.5mol/LNaCl. More than 40% hydroxyl is a methylated hydroxyl replacement that can bedissolved in water to form a stable high-viscosity colloid solution.