Influencing Factors ntawm Sodium carboxymethylcellulose Viscosity

Lub viscosity ntawm sodium carboxymethylcellulose (CMC) kev daws teeb meem tuaj yeem cuam tshuam los ntawm ntau yam. Nov yog qee yam tseem ceeb uas cuam tshuam rau viscosity ntawm CMC cov kev daws teeb meem:

1. Concentration: Lub viscosity ntawm CMC cov kev daws teeb meem feem ntau nce nrog nce concentration. Qhov siab dua ntawm CMC ua rau cov saw hlau polymer ntau dua hauv kev daws teeb meem, ua rau muaj ntau dua molecular entanglement thiab viscosity ntau dua. Txawm li cas los xij, feem ntau muaj kev txwv rau qhov viscosity nce ntawm qhov siab dua vim yog yam xws li kev daws teeb meem rheology thiab polymer-kua sib cuam tshuam.
2. Degree of Substitution (DS): Cov degree ntawm kev hloov pauv yog hais txog qhov nruab nrab ntawm cov carboxymethyl pawg hauv ib chav tsev piam thaj hauv cov saw cellulose. CMC nrog DS siab dua yuav muaj viscosity ntau dua vim tias nws muaj cov pab pawg them ntau dua, uas txhawb kev sib cuam tshuam ntawm intermolecular muaj zog thiab tiv thaiv ntau dua.
3. Molecular Luj: Qhov hnyav molecular ntawm CMC tuaj yeem cuam tshuam nws cov viscosity. Qhov hnyav dua molecular CMC feem ntau ua rau cov viscosity ntau dua vim yog cov saw hlau txuas ntxiv thiab cov saw hlau ntev dua. Txawm li cas los xij, ntau dhau qhov hnyav molecular CMC kuj tseem tuaj yeem ua rau muaj kev daws teeb meem ntxiv viscosity yam tsis muaj qhov sib npaug ntawm cov thickening efficiency.
4. Kub: Kub muaj qhov cuam tshuam loj rau cov viscosity ntawm CMC kev daws teeb meem. Feem ntau, viscosity txo qis thaum kub nce vim txo cov polymer-kua sib cuam tshuam thiab ua kom muaj zog molecular. Txawm li cas los xij, qhov cuam tshuam ntawm qhov kub thiab txias ntawm viscosity tuaj yeem sib txawv nyob ntawm cov yam ntxwv xws li polymer concentration, molecular hnyav, thiab cov tshuaj pH.
5. pH: Lub pH ntawm cov tshuaj CMC tuaj yeem cuam tshuam rau nws cov viscosity vim kev hloov pauv hauv polymer ionization thiab conformation. CMC feem ntau yog viscous ntau dua pH qhov tseem ceeb vim hais tias cov carboxymethyl pawg yog ionized, ua rau muaj zog electrostatic repulsions ntawm polymer chains. Txawm li cas los xij, huab cua pH tuaj yeem ua rau muaj kev hloov pauv hauv polymer solubility thiab conformation, uas yuav cuam tshuam rau viscosity txawv nyob ntawm seb CMC qib thiab formulation.
6. Cov ntsiab lus ntsev: Lub xub ntiag ntawm cov ntsev hauv cov tshuaj tuaj yeem cuam tshuam cov viscosity ntawm CMC cov kev daws teeb meem los ntawm kev cuam tshuam ntawm polymer-kua sib cuam tshuam thiab kev sib cuam tshuam ion-polymer. Qee zaum, qhov sib ntxiv ntawm cov ntsev tuaj yeem nce viscosity los ntawm kev tshuaj ntsuam electrostatic repulsions ntawm polymer chains, thaum nyob rau hauv lwm yam mob, nws yuav txo tau viscosity los ntawm disrupting polymer-kua sib cuam tshuam thiab txhawb polymer aggregation.
7. Shear Rate: Lub viscosity ntawm CMC cov kev daws teeb meem kuj tuaj yeem nyob ntawm tus nqi shear lossis tus nqi ntawm qhov kev ntxhov siab rau kev daws. CMC cov kev daws teeb meem feem ntau nthuav tawm tus cwj pwm shear-thinning, qhov twg viscosity txo qis nrog nce shear npaum li cas vim kev sib dhos thiab kev taw qhia ntawm cov saw hlau polymer raws li cov kev taw qhia ntws. Qhov luaj li cas ntawm shear thinning yuav txawv nyob ntawm seb yam xws li polymer concentration, molecular hnyav, thiab kua pH.

Lub viscosity ntawm sodium carboxymethylcellulose cov kev daws teeb meem yog cuam tshuam los ntawm kev sib xyaw ua ke nrog rau cov concentration, qib kev hloov pauv, qhov hnyav molecular, kub, pH, ntsev cov ntsiab lus, thiab shear rate. Kev nkag siab txog cov xwm txheej no yog qhov tseem ceeb rau kev ua kom zoo dua qhov viscosity ntawm CMC cov kev daws teeb meem rau cov ntawv thov tshwj xeeb hauv kev lag luam xws li zaub mov, tshuaj, tshuaj pleev ib ce, thiab kev saib xyuas tus kheej.