Hydroxypropylmethylcellulose (HPMC) yog cov dej-soluble polymer muab los ntawm ntuj cellulose thiab yog dav siv nyob rau hauv ntau industries vim nws muaj peev xwm los tsim ib tug ntau yam ntawm viscosities nyob rau hauv aqueous daws. HPMC muaj ntau yam kev siv hauv kev lag luam tshuaj, zaub mov thiab tshuaj pleev ib ce. Viscosity yog tus cwj pwm tseem ceeb ntawm HPMC cov kev daws teeb meem uas cuam tshuam rau lawv cov kev ua tau zoo hauv cov ntawv thov no.
Cov yam ntxwv cuam tshuam rau viscosity:
1. Concentration: Lub concentration ntawm HPMC nyob rau hauv cov tshuaj yog ncaj qha mus rau lub viscosity ntawm cov tshuaj. Raws li HPMC concentration nce, lub viscosity ntawm cov tshuaj yuav nce raws li cov polymer chains ua ntau entangled. Txawm li cas los xij, qhov siab dhau heev tuaj yeem ua rau muaj qhov tawv thiab zoo li cov tshuaj gel, uas tej zaum yuav tsis xav tau rau qee qhov kev siv.
2. Molecular hnyav: Qhov hnyav molecular ntawm HPMC yog qhov tseem ceeb cuam tshuam rau viscosity ntawm cov tshuaj. Raws li qhov hnyav molecular ntawm HPMC nce, lub viscosity ntawm cov tshuaj kuj nce vim muaj zog entanglement ntawm cov polymer chains. HPMC nrog qhov hnyav dua molecular muaj cov chains ntev dua, ua rau muaj cov kua nplaum ntau dua.
3. Kub: Lub viscosity ntawm HPMC tov kuj raug cuam tshuam los ntawm qhov kub thiab txias. Raws li qhov kub ntawm cov tshuaj nce, viscosity ntawm cov tshuaj txo. Qhov txo qis hauv viscosity yog vim qhov txo qis ntawm cov rog sib xyaw ntawm cov saw hlau polymer, ua rau muaj kev cuam tshuam tsawg dua thiab ua kom muaj dej ntau ntxiv.
4. tus nqi pH: Tus nqi pH ntawm cov tshuaj kuj tseem cuam tshuam rau viscosity ntawm HPMC cov tshuaj. pH qhov tseem ceeb sab nraud ntawm 5.5-8 ntau yam yuav ua rau txo qis hauv viscosity vim muaj kev hloov pauv hauv solubility thiab nqi ntawm HPMC polymer.
5. Salinity: Cov ntsev los yog ionic zog ntawm cov tshuaj kuj cuam tshuam rau viscosity ntawm HPMC tov. Kev nce ntsev concentration cuam tshuam nrog HPMC polymer saw kev sib cuam tshuam, ua rau txo qis hauv cov tshuaj viscosity.
6. Shear tej yam kev mob: Lub shear tej yam kev mob nyob rau hauv uas cov tshuaj HPMC raug nthuav tawm kuj yuav cuam tshuam cov viscosity ntawm cov tshuaj. Shear tej yam kev mob tuaj yeem ua rau txo qis hauv viscosity ib ntus, xws li thaum sib tov lossis siv cov tshuaj tov. Thaum cov txheej txheem shear raug tshem tawm, viscosity sai sai rov qab mus rau lub xeev khov kho.
nyob rau hauv xaus:
Lub viscosity ntawm HPMC aqueous daws yog cuam tshuam los ntawm ntau yam uas yuav tsum tau xav txog thaum tsim cov khoom. Concentration, molecular hnyav, kub, pH, salinity, thiab shear tej yam kev mob yog cov tseem ceeb tshaj plaws yam uas cuam tshuam rau lub viscosity ntawm HPMC kev daws teeb meem. Kev nkag siab txog cov xwm txheej no tuaj yeem pab cov tuam txhab tsim kho qhov viscosity ntawm HPMC cov kev daws teeb meem rau cov ntawv thov tshwj xeeb. Viscosity yog tus yam ntxwv tseem ceeb ntawm HPMC cov kev daws teeb meem vim nws tuaj yeem txiav txim siab qhov ua tau zoo thiab ruaj khov ntawm HPMC-based cov khoom.
Post lub sij hawm: Oct-16-2023