The cellulose ether is a polymer compound having an ether structure made of cellulose, and each glucosyl ring in the cellulose macromolecule contains three hydroxyl groups, a primary hydroxyl group on the sixth carbon atom, and a second or three carbon atoms. The secondary hydroxyl group, the hydrogen in the hydroxyl group is substituted with a hydrocarbon group to form a cellulose ether derivative.
According to the chemical structure classification of the substituents, they can be classified into anionic, cationic and nonionic ethers.
Depending on the etherifying agent used, there are methyl cellulose, carboxymethyl cellulose, ethyl cellulose, benzyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, cyanoethyl cellulose, Benzyl cyanoethyl cellulose, carboxymethyl hydroxyethyl cellulose, phenyl cellulose, and the like. Methylcellulose and ethylcellulose are more practical.
The solubility of cellulose after etherification changes significantly, and it can be dissolved in water, dilute acid, dilute alkali or organic solvent. The solubility depends mainly on three factors: (1) the characteristics of the groups introduced during the etherification process, introduced The larger the group, the lower the solubility, the stronger the polarity of the introduced group, the more soluble the cellulose ether is in water, and (2) the degree of substitution and the distribution of the etherified group in the macromolecule. Most cellulose ethers can only be dissolved in water under a certain degree of substitution, and the degree of substitution is between 0 and 3. (3) The degree of polymerization of cellulose ether, the higher the degree of polymerization, the more difficult to dissolve; the higher the degree of polymerization Low, the wider the range of substitutions that are soluble in water. Cellulose ethers are widely used in construction, cement, petroleum, food, textiles, detergents, coatings, pharmaceuticals, papermaking and electronic components industries. The hydrogen of hydroxyl groups in cellulose polymers is replaced by hydrocarbon groups. Product. Cellulose is a polyhydroxy polymer compound which neither dissolves nor melts. The cellulose is soluble in water, a dilute alkali solution and an organic solvent after etherification, and has thermoplasticity.
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