HPMC (HydroxyPropyyl methylcellulose) yog ib qho kev siv polymer uas muaj nyob hauv cov tshuaj, khoom noj thiab kev lag luam kom hniav. Nws yog lub cellulose derivative ua los ntawm kev kho cov tshuaj kho ntuj ntuj moov. Ib qho ntawm cov khoom tseem ceeb ntawm HPMC yog nws viscosity, uas hloov pauv ntawm ntau yam xws li kub.
Viscosity yog kev ntsuas ntawm cov kua dej lossis cov khoom tiv thaiv kom ntws. Rau HPMC Polymers, viscosity yog tus yuam sij ntsuas uas cuam tshuam rau cov khoom siv hauv ntau yam kev siv. Lub visccosity ntawm HPMC cuam tshuam los ntawm ntau yam xws li kev hnyav molecular, Qib ntawm hloov chaw, thiab kub.
Viscosity-Kub Kev Sib Raug Zoo ntawm HPMC Polymers
HPMC cov pa xoos pa taws ua kom muaj kev sib raug zoo ntawm kev sib raug zoo ntawm viscosity thiab kub. Feem ntau hais lus, muaj kev nce ntxiv rau hauv qhov kub ua rau txo cov viscosity tsawg. Tus cwj pwm no tuaj yeem piav qhia los ntawm:
1. Qhov kub thiab txias cuam tshuam hydrogen delding
Hauv HPMC polymers, intrololular hydrogen bonds yog lub luag haujlwm rau kev sib sau tus qauv network muaj zog. Qhov qauv network no pab txhim kho cov viscosity ntawm cov khoom siv. Nce ntxiv qhov kub ua rau cov hydrogen bonds tawg, yog li txo cov kev sib tw sib xyaw thiab li txo cov viscosity. Conversely, ib qho kev txo qis hauv qhov kub ua rau cov hydrogen ntau dua los ua, ua rau muaj kev nce qib hauv viscosposity.
2. Qhov kub thiab kub cuam tshuam molecular suab
Thaum ntau dua txias, cov lwg me me nyob rau hauv HPMC polymer chains muaj ntau dua lub zog rov qab thiab tuaj yeem txav tau ywj siab dua. Qhov no nce molecular suab molecular cuam tshuam cov qauv polymer thiab txo nws viscosity.
3. Qhov kub thiab kub cuam tshuam cov khoom siv
Lub viscosity ntawm HPMC polymer cov ntsiab kuj yog nyob ntawm qhov xwm ntawm cov kuab tshuaj. Qee cov kuab tshuaj, xws li dej, nthuav qhia qhov txo qis hauv viscosity li qhov kub kub nce vim tsis muaj zog ntawm hydrogen kev sib haum. Hauv kev sib piv, qee cov kuab tshuaj pom zoo nce ntxiv nce viscosity ntawm cov kub siab dua, xws li glycerol.
Nws yog tsim nyog sau tseg tias cov tshwj xeeb ntawm qhov kub-viscosity kev sib raug zoo rau HPMC tuaj yeem vam meej ntawm cov polymer uas muaj txiaj ntsig zoo thiab cov kuab siv siv. Piv txwv li, qee qhov kev nthuav dav HPMC pov thawj muaj zog kub heev, thaum lwm tus nyob ruaj khov. Ntxiv mus, lub viscosity ntawm HPMC nce raws li kev nce siab nce, thiab kev sib raug zoo ntawm kev sib raug zoo thiab viscosity kuj hloov tau.
Qhov tseem ceeb ntawm viscosity hauv HPMC cov ntawv thov
Hauv kev lag luam kws tshuaj, HPMC feem ntau siv cov neeg siv tshuaj, qhov twg los tswj cov tshuaj tso tawm tshuaj thiab kev coj tus cwj pwm yuav tsum muaj. Viscosity plays me ntsis lub luag haujlwm hauv kev tso tshuaj tso yeeb tshuaj raws li nws cuam tshuam nrog kev sib txawv ntawm cov tshuaj diffusion los ntawm Polymer Matrix. Ib qho ntxiv, cov viscosity ntawm HPMC kuj tseem ceeb rau cov qauv txheej txheem, ntau dua viscosity yog qhov yuav tsum tau ua kom ntseeg tau cov txheej txheem thiab cov txheej txuas ntxiv.
Cov khoom noj khoom haus uas siv HPMC ua tus sawv cev HPMC thiab emulsifier xav tau tias cov khoom tseem ruaj khov thiab ua raws li kev ua haujlwm. Ib yam li ntawd, tshuaj pleev ib ce uas siv HPMC ua cov tshuaj tiv thaiv HPMC, ib qho uas yuav tsum tau hloov kho thiab viscos tuaj yeem hloov kho raws li cov khoom xav tau.
HPMC yog ib qho ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau ntau yam ua pov thawj kev sib raug zoo ntawm viscosity thiab kub. Muaj qhov ntsuas kub nce nyob rau hauv viscosity, feem ntau vim muaj qhov kub ntawm interbonen hydrogen tsev, molecular suab, thiab cov khoom siv molvent. Nkag siab txog qhov kub-viscosity kev sib raug zoo ntawm HPMC cov polymers tuaj yeem pab tsim cov khoom lag luam nrog cov khoom ntiag tug thiab cov khoom xav tau. Yog li ntawd, txoj kev kawm ntawm HPMC viscosity yog qhov tseem ceeb los ua kom ntseeg tau tias kev ua yeeb yam zoo hauv ntau yam kev siv hauv cov ntawv thov hauv kev lag luam thiab kev lag luam kom zoo nkauj.
Lub Sijhawm Post: Feb-19-2025