Rheological kev tshawb fawb ntawm hydroxypropylulose (HPMC) Thickener system yog qhov tseem ceeb rau kev nkag siab lawv tus cwjpwm, xws li ntawm cov kws tshuaj rau cov zaub mov thiab tshuaj pleev ib ce. HPMC yog lub cellulose ether derivative dav siv los ua tus neeg tsis huv, thiab emulsifier vim nws lub peev xwm los hloov kho lub zog rheological ntawm kev daws teeb meem thiab kev ncua.
1.Txhua kev ntsuas:
Viscosity yog ib qho ntawm feem ntau qhov hluav taws xob rheological cov khoom kawm hauv HPMC tshuab. Ntau cov tswv yim xws li kev hloov pauv visiCometry, cov tshuaj tiv thaiv kab mob viscometry, thiab escillatory rheasometry tau ua haujlwm los ntsuas viscosity.
Cov kev tshawb fawb no rho tawm cov txiaj ntsig zoo li HPMC concentration, hnyav hnyav, qib degech, thiab shear tus nqi ntawm viscosity.
Tasr to viscosity yog qhov tseem ceeb thaum nws yog tus cwj pwm khiav, ruaj khov, thiab kev siv haum rau HPMC tuab.
2.Qhov-thinning tus cwj pwm:
HPMC cov ntsiab lus feem ntau ua rau muaj tus cwj pwm shear-thij tus cwj pwm, txhais tau tias lawv viscosity txo qis nrog nce shear tus nqi.
Rheological kev tshawb fawb delve rau ntawm shear-thinning thiab nws txoj kev vam khom rau ntawm qhov zoo li polymer concentration thiab kub.
Tshaj tawm shear-thinning tus cwj pwm yog qhov tseem ceeb rau kev siv xws li txheej thiab cov nplaum, uas muaj kev ruaj khov tom qab thov.
3.Thotropy:
Thixotropy yog hais txog lub sijhawm-nyob rov qab ntawm viscosity tom qab tshem tawm ntawm shear kev ntxhov siab. Ntau HPMC tshuab ua yeeb yam thixotropic tus cwj pwm, uas yog qhov zoo hauv cov ntawv thov tau tswj hwm ntws thiab ruaj khov.
Rheological cov kev tshawb fawb suav nrog kev rov qab los ntawm viscosity dhau sijhawm tom qab kev ntxhov siab rau kev ntxhov siab.
Nkag siab txog cov khoom lag luam zoo li cov khoom lag luam zoo li cov xim thav duab, qhov chaw ruaj khov thaum lub sijhawm ntawv thov yog qhov tseem ceeb.
4.Gelation:
Ntawm ntau dua cov kev txiav txim siab lossis nrog cov kev sib ntxiv ntawm HPMC tuaj yeem dhau los ua kev lom zem, tsim cov qauv kev sib txuas.
Rheological kev tshawb fawb tshawb xyuas qhov kev coj ua gelation txog yam xws li kev xav tau, kub, thiab Ph.
Kev tshawb nrhiav gelation yog qhov tseem ceeb rau kev tsim cov tshuaj raug rho tawm thiab tsim cov khoom lag luam uas ruaj khov nyob hauv cov khoom noj thiab kev saib xyuas tus kheej.
5. Cov nuj nqis:
Cov tswv yim xws li cov duab me me-xoo hluav taws xob (SAxs) thiab RHEO-SAXS muab kev pom rau hauv HPMC cov tshuab.
Cov kev tshawb fawb no nthuav tawm cov ntaub ntawv qhia txog polymer saw kev ua kom zoo, kev sib cav sib ceg, thiab kev sib cuam tshuam nrog cov kuab tshuaj molecules.
Nkag siab txog cov txheej txheem kev ua haujlwm pab ua kom pom kev ua kom pom kev zoo macroscopic thiab kev txhim kho kom tsim nyog rau cov khoom xav tau.
6.Dynamic kev tsom xam (DMA):
DMA ntsuas cov khoom siv Viscoelastic muaj cov khoom siv hauv qab oscilliation deformation.
Rheological kev tshawb fawb siv DMA eluceters tsis zoo xws li rooj modulus (g '), ploj modulus (g "), thiab complex viscosity raws li cov haujlwm thiab kub.
DMA yog pab tau tshwj xeeb rau cov yam ntxwv zoo li thiab kua dej zoo li kev coj ua ntawm HPMC gels thiab pastes.
7.Application-cov kev tshawb fawb tshwj xeeb:
Rheological kev tshawb fawb tau ua rau cov ntawv thov tshwj xeeb xws li cov ntsiav tshuaj ntawm cov chaw tshuaj, qhov chaw HPMC zoo li cov kua zaub thiab hnav khaub ncaws, uas nws ua raws li cov tuab thiab tawv.
Cov kev tshawb fawb no ua kom zoo HPMC cov qauv rau qhov xav tau Flow cov khoom, kev ntxhib los mos, thiab txee rau khoom siv thiab cov neeg siv khoom txais kev lag luam.
Rureological kev tshawb nrhiav ua lub luag haujlwm tseem ceeb hauv kev nkag siab txog HPMC thickener tshuab. Los ntawm Elucidating Viscosity, Thixotropy, Thixotropy, thiab cov kev thov tshwj xeeb, cov kev tshawb fawb tshwj xeeb ntawm kev lag luam HPMC thoob plaws ntau yam lag luam.
Lub Sijhawm Post: Lub Tsib Hlis-10-2024