Sodium Carboxymethyl cellulose zog thiab Influencing Factors ntawm CMC Viscosity

Sodium Carboxymethyl cellulose (CMC) yog cov khoom siv polymer feem ntau siv hauv ntau daim ntawv thov kev lag luam, suav nrog zaub mov, tshuaj, khoom tu tus kheej, thiab tshuaj ntxuav tes. Nws yog ib qho dej-soluble derivative ntawm cellulose uas yog tsim los ntawm cov tshuaj tiv thaiv ntawm cellulose nrog chloroacetic acid thiab sodium hydroxide. CMC muaj ntau yam thiab muaj ntau yam khoom uas ua rau nws haum rau ntau yam kev siv. Hauv tsab xov xwm no, peb yuav tham txog cov khoom ntawm CMC thiab cov yam ntxwv uas cuam tshuam rau nws cov viscosity.

Cov yam ntxwv ntawm CMC:

1. Solubility: CMC yog soluble hauv dej, uas ua rau nws yooj yim los lis thiab siv ntau yam kev siv. Nws tuaj yeem yaj hauv qee cov kuab tshuaj organic, xws li ethanol thiab glycerol, nyob ntawm nws qhov kev hloov pauv.
2. Viscosity: CMC yog ib qho viscous polymer uas tuaj yeem tsim cov gels ntawm qhov siab. Lub viscosity ntawm CMC yog cuam tshuam los ntawm ntau yam, xws li qib kev hloov pauv, concentration, pH, kub, thiab electrolyte concentration.
3. Rheology: CMC nthuav tawm tus cwj pwm pseudoplastic, uas txhais tau hais tias nws cov viscosity txo qis nrog nce shear npaum li cas. Cov cuab yeej no muaj txiaj ntsig zoo hauv cov ntawv thov uas xav tau viscosity siab thaum ua tiav, tab sis tsis tshua muaj viscosity xav tau thaum thov.
4. Stability: CMC yog ruaj khov nyob rau ntau yam ntawm pH thiab kub tej yam kev mob. Nws kuj tseem tiv taus microbial degradation, uas ua rau nws tsim nyog siv rau hauv cov khoom noj thiab tshuaj siv.
5. Film-forming zog: CMC tuaj yeem tsim cov yeeb yaj kiab nyias, hloov tau yooj yim thaum qhuav. Cov yeeb yaj kiab no muaj cov khoom thaiv zoo thiab tuaj yeem siv los ua cov txheej txheem rau ntau yam kev siv.

Cov yam ntxwv uas cuam tshuam rau CMC viscosity:

1. Degree ntawm kev hloov pauv (DS): Qhov kev hloov pauv yog qhov nruab nrab ntawm cov carboxymethyl pawg ib chav tsev anhydroglucose hauv cellulose molecule. CMC nrog DS siab dua muaj kev hloov pauv ntau dua, uas ua rau muaj viscosity ntau dua. Qhov no yog vim tias DS siab dua ua rau ntau pawg carboxymethyl, uas ua rau muaj cov dej molecules ua ke rau polymer.
2. Concentration: Lub viscosity ntawm CMC nce nrog nce concentration. Qhov no yog vim hais tias ntawm cov concentrations ntau dua, ntau cov saw hlau polymer tam sim no, uas ua rau muaj kev cuam tshuam ntau dua thiab nce viscosity.
3. pH: Lub viscosity ntawm CMC cuam tshuam los ntawm pH ntawm cov tshuaj. Thaum qis pH, CMC muaj viscosity ntau dua vim tias cov pawg carboxyl nyob hauv lawv daim ntawv protonated thiab tuaj yeem cuam tshuam nrog cov dej molecules ntau dua. Ntawm pH siab, CMC muaj qhov qis dua vim tias cov pawg carboxyl nyob hauv lawv daim ntawv deprotonated thiab muaj kev cuam tshuam tsawg dua nrog cov dej molecules.
4. Kub: Lub viscosity ntawm CMC txo nrog nce kub. Qhov no yog vim hais tias ntawm qhov kub siab dua, cov saw hlau polymer muaj ntau lub zog thermal, uas ua rau muaj kev txav mus los ntau dua thiab txo cov viscosity.
5. Electrolyte concentration: Lub viscosity ntawm CMC cuam tshuam los ntawm qhov muaj cov electrolytes hauv cov tshuaj. Nyob rau hauv high electrolyte concentrations, lub viscosity ntawm CMC txo vim hais tias cov ions nyob rau hauv cov tshuaj tuaj yeem cuam tshuam nrog cov carboxyl pawg ntawm cov polymer thiab txo lawv cov kev cuam tshuam nrog dej molecules.

Nyob rau hauv xaus, Sodium Carboxymethyl cellulose (CMC) yog ib tug ntau yam polymer uas muaj ntau yam khoom, xws li solubility, viscosity, rheology, stability, thiab film-forming zog. Lub viscosity ntawm CMC yog cuam tshuam los ntawm ntau yam, xws li qib kev hloov pauv, concentration, pH, kub, thiab electrolyte concentration. Kev nkag siab txog cov xwm txheej no yog qhov tseem ceeb rau kev ua kom zoo dua ntawm CMC hauv ntau daim ntawv thov.