Carboxymethyl cellulose (CMC) yog cov dej-soluble cellulose derivative uas tau siv dav hauv ntau yam lag luam, suav nrog zaub mov, tshuaj, thiab kev saib xyuas tus kheej. Qhov degree ntawm kev hloov pauv (DS) yog ib qho tseem ceeb uas cuam tshuam rau cov khoom ntawm CMC. Hauv tsab xov xwm no, peb yuav tham txog kev cuam tshuam ntawm DS ntawm carboxymethyl cellulose zoo.
Ua ntej, nws yog ib qho tseem ceeb kom nkag siab tias qhov degree ntawm kev hloov pauv yog dab tsi. Qib ntawm kev hloov pauv yog hais txog tus naj npawb ntawm carboxymethyl pawg rau ib chav tsev piam thaj hauv cov saw cellulose. CMC yog tsim los ntawm reacting cellulose nrog sodium monochloroacetate thiab sodium hydroxide. Thaum cov tshuaj tiv thaiv no, pawg hydroxyl ntawm cov saw cellulose hloov los ntawm carboxymethyl pawg. Qhov kev hloov pauv tuaj yeem tswj tau los ntawm kev sib txawv ntawm cov tshuaj tiv thaiv, xws li cov concentration ntawm sodium hydroxide thiab sodium monochloroacetate, lub sijhawm tshuaj tiv thaiv, thiab qhov kub thiab txias.
DS ntawm CMC cuam tshuam rau nws lub cev thiab tshuaj lom neeg, xws li nws cov solubility, viscosity, thiab thermal stability. CMC nrog qis DS muaj qhov siab dua ntawm crystallinity thiab yog dej-soluble tsawg dua CMC nrog DS siab. Qhov no yog vim hais tias cov carboxymethyl pawg hauv CMC nrog cov DS tsawg nyob rau ntawm qhov chaw ntawm cov saw cellulose, uas txo nws cov dej-solubility. Nyob rau hauv sib piv, CMC nrog ib tug siab DS muaj ib tug ntau amorphous qauv thiab yog dej-soluble ntau tshaj CMC nrog ib tug tsawg DS.
Lub viscosity ntawm CMC kuj cuam tshuam los ntawm DS. CMC nrog qis DS muaj qhov viscosity qis dua CMC nrog DS siab. Qhov no yog vim hais tias cov carboxymethyl pawg hauv CMC nrog DS qis yog sib nrug ntxiv, uas txo cov kev sib cuam tshuam ntawm cov cellulose chains thiab txo cov viscosity. Nyob rau hauv sib piv, CMC nrog ib tug siab DS muaj viscosity ntau dua vim hais tias cov carboxymethyl pawg nyob ze ua ke, uas ua rau kom muaj kev sib cuam tshuam ntawm cov cellulose chains thiab nce viscosity.
Ntxiv rau nws cov khoom siv lub cev, DS ntawm CMC kuj cuam tshuam rau nws cov khoom siv tshuaj. CMC nrog DS qis tsis tshua muaj kev ruaj ntseg ntawm qhov kub thiab txias thiab pH qhov tseem ceeb tshaj CMC nrog DS siab. Qhov no yog vim hais tias cov pawg carboxymethyl hauv CMC nrog DS qis dua yog qhov cuam tshuam rau hydrolysis thiab tuaj yeem tawg hauv cov xwm txheej hnyav. Nyob rau hauv sib piv, CMC nrog ib tug siab DS yog ruaj khov nyob rau hauv high kub thiab pH qhov tseem ceeb vim hais tias cov carboxymethyl pawg yog nruj nreem khi rau cov saw cellulose.
Post lub sij hawm: Mar-10-2023