Synthesis and characterization of sodium‐carboxymethylcellulose from cotton, powder, microcrystalline and nanocellulose

Abstract

Cotton cellulose, powder cellulose, microcrystalline cellulose and nanocellulose were carboxymethylated with monochloroacetic acid by the suspension method in an ethyl alcohol medium. The effects of reaction conditions such as cellulose materials, sodium hydroxide concentration, molar NaOH/anhydroglucose unit ratio, monochloroacetic acid consumption, reaction temperature and etherification time on product quality, especially the degree of substitution, degree of polymerization and water solubility of sodium‐carboxymethylcellulose, were studied. By controlling these parameters, completely water‐soluble sodium‐carboxymethylcellulose samples with a high degree of substitution within 0.75, 1.47, 0.88, and 1.23 were obtained from cotton cellulose, powder cellulose, microcrystalline and nanocellulose. The boundaries of complete solubility of the obtained sodium‐carboxymethylcellulose were at low degrees of substitution (0.6, 0.44, 0.43, 0.33) and degrees of polymerization (880, 490, 240, 150) obtained from cotton cellulose, powder cellulose, microcrystalline cellulose and nanocellulose, respectively.

Preparation and properties of nanocomposite films based on carboxymethylcellulose and melanin from Cladosporium endophytic fungus

“…CMC was synthesized from nanocellulose through esteri cation with monochloroacetic acid, following the method [33] with some modi cations. First, nanocellulose isolated from cotton cellulose [26,34] was pre-activated with a 16% solution of sodium hydroxide, and then an equal amount of isopropyl alcohol was added.…”

Sustrato de hidrogel de celulosa modificado con macroporosidad mediante microtomografía computarizada e impresión 3D para cultivo sin suelo

“…La carboximetilcelulosa (CMC) es un derivado de la celulosa obtenido por modificación química. Se obtiene reemplazando el grupo hidroxilo en las cadenas de glucopiranosa de la celulosa con los grupos carboximetilo (-CH2COOH) [38]. La CMC cuenta con propiedades mecánicas aceptables, es altamente hidrofílico su PH es ajustable, tiene una buena capacidad de formación de hidrogel bajo control químico y biocompatibilidad.…”

Formation, structure, and morphology of nanofiber mat on the base sodium‐carboxymethylcellulose/polyvinyl‐alcohol/silver nanoparticles composite

“…Purified Na‐CMC 16 is widely used in pharmaceuticals and medical practices due to its adhesiveness, biodegradability, biosolubility, and nontoxicity. It has the ability to form gels, suspensions, microneedles, nanofibers and films, and possesses sorption and stabilizing properties.…”