Kev tshawb fawb Rheological ntawm Hydroxypropyl Methylcellulose (HPMC) thickener systems yog qhov tseem ceeb rau kev nkag siab txog lawv tus cwj pwm hauv ntau yam kev siv, xws li tshuaj mus rau zaub mov thiab tshuaj pleev ib ce.HPMC yog ib qho cellulose ether derivative dav siv los ua tus neeg sawv cev thickening, stabilizer, thiab emulsifier vim nws muaj peev xwm hloov kho rheological zog ntawm kev daws teeb meem thiab kev ncua.
1. Kev ntsuas viscosity:
Viscosity yog ib qho tseem ceeb tshaj plaws rheological zog kawm hauv HPMC systems.Ntau cov tswv yim xws li kev sib hloov viscometry, capillary viscometry, thiab oscillatory rheometry yog siv los ntsuas viscosity.
Cov kev tshawb fawb no qhia txog cov txiaj ntsig ntawm yam xws li HPMC concentration, molecular hnyav, qib hloov pauv, kub, thiab shear tus nqi ntawm viscosity.
Kev nkag siab viscosity yog qhov tseem ceeb vim nws txiav txim siab tus cwj pwm ntws, kev ruaj ntseg, thiab kev thov kom haum ntawm HPMC cov tshuab tuab.
2.Shear-Thinning Cwj Pwm:
HPMC cov kev daws teeb meem feem ntau nthuav tawm tus cwj pwm shear-thinning, txhais tau tias lawv cov viscosity txo qis nrog nce shear npaum li cas.
Kev tshawb fawb rheological delve rau hauv qhov ntawm shear-thinning thiab nws txoj kev vam khom rau yam xws li polymer concentration thiab kub.
Kev coj tus cwj pwm shear-thinning yog qhov tseem ceeb rau cov ntawv thov xws li txheej txheej thiab cov nplaum, qhov twg ntws thaum thov thiab kev ruaj ntseg tom qab thov yog qhov tseem ceeb.
3. Thixotropy:
Thixotropy hais txog lub sijhawm rov qab los ntawm viscosity tom qab tshem tawm ntawm kev ntxhov siab.Ntau lub tshuab HPMC qhia txog tus cwj pwm thixotropic, uas yog qhov zoo hauv cov ntawv thov uas xav tau kev tswj hwm kev khiav thiab kev ruaj ntseg.
Cov kev tshawb fawb rheological suav nrog ntsuas qhov rov qab los ntawm viscosity dhau sijhawm tom qab raug lub kaw lus rau kev ntxhov siab.
Nkag siab txog thixotropy pab hauv kev tsim cov khoom xws li cov xim, qhov chaw ruaj khov thaum lub sij hawm cia thiab yooj yim ntawm daim ntawv thov yog qhov tseem ceeb.
4.Gelation:
Ntawm qhov siab dua lossis nrog cov khoom siv tshwj xeeb, HPMC cov kev daws teeb meem tuaj yeem raug gelation, tsim cov qauv hauv network.
Cov kev tshawb fawb rheological tshawb xyuas tus cwj pwm gelation txog yam xws li concentration, kub, thiab pH.
Cov kev tshawb fawb gelation yog qhov tseem ceeb rau kev tsim cov tshuaj tiv thaiv kev tso tawm thiab tsim cov khoom lag luam gel ruaj khov hauv cov khoom noj thiab kev tu tus kheej.
5.Structural Characterization:
Cov txuj ci xws li lub kaum sab xis me me X-ray tawg (SAXS) thiab rheo-SAXS muab kev nkag siab rau hauv microstructure ntawm HPMC systems.
Cov kev tshawb fawb no nthuav tawm cov ntaub ntawv hais txog kev sib txuas ntawm cov saw hlau polymer, kev coj tus cwj pwm sib sau ua ke, thiab kev cuam tshuam nrog cov kuab tshuaj molecules.
Kev nkag siab txog cov qauv tsim pab hauv kev kwv yees tus cwj pwm rheological macroscopic thiab optimizing formulations rau cov khoom xav tau.
6.Dynamic Mechanical Analysis (DMA):
DMA ntsuas cov viscoelastic zog ntawm cov ntaub ntawv nyob rau hauv oscillatory deformation.
Kev tshawb fawb rheological siv DMA elucidate tsis xws li cia modulus (G'), poob modulus (G"), thiab nyuaj viscosity raws li kev ua haujlwm ntawm zaus thiab kub.
DMA yog tshwj xeeb tshaj yog muaj txiaj ntsig zoo rau kev ua tus cwj pwm zoo li cov kua dej zoo li HPMC gels thiab pastes.
7.Application-Specific Studies:
Cov kev tshawb fawb rheological tau tsim los rau cov kev siv tshwj xeeb xws li cov tshuaj ntsiav tshuaj, qhov twg HPMC siv los ua cov ntaub qhwv, lossis hauv cov khoom noj xws li cov kua ntses thiab hnav khaub ncaws, qhov twg nws ua cov thickener thiab stabilizer.
Cov kev tshawb fawb no optimize HPMC formulations rau cov khoom uas xav tau, kev ntxhib los mos, thiab txee ruaj khov, ua kom cov khoom ua tau zoo thiab cov neeg siv khoom txaus siab.
Kev tshawb fawb rheological ua lub luag haujlwm tseem ceeb hauv kev nkag siab txog tus cwj pwm nyuaj ntawm HPMC thickener systems.Los ntawm elucidating viscosity, shear-thinning, thixotropy, gelation, structural yam ntxwv, thiab daim ntawv thov-specific zog, cov kev tshawb fawb no pab tsim thiab optimization ntawm HPMC-raws li formulations nyob rau hauv ntau yam industries.
Post lub sij hawm: May-10-2024