HydroxyPropy cellulose (HPMC) yog kev siv ntau yam kev lag luam, suav nrog cov tshuaj, kev tsim kho, khoom noj, tshuaj pleev ib ce, thiab lwm yam. Nws cov ntawv thov sib txawv los ntawm nws cov khoom, xws li kev ua yeeb yam zoo, xaim peev muaj peev xwm, cov khoom siv khi cia, thiab cov dej khaws cia. Qhov zoo tshaj ntawm HPMC yog qhov tseem ceeb heev rau kev ua tau zoo thiab kev nyab xeeb ntawm cov khoom lag luam nyob rau hauv uas nws tau siv.
1.chemical composition:
Cov tshuaj lom neeg muaj pes tsawg leeg ntawm HPMC yog qhov tseem ceeb rau nws qhov zoo. HPMC yog qhov ua kom muaj txiaj ntsig ntawm cellulose, hloov kho los ntawm hydroxypropy thiab methylation cov txheej txheem. Cov qib ntawm kev hloov pauv (DS) ntawm cov pab pawg medroxyprropyl thiab cov pab pawg methoxy cuam tshuam nws cov khoom. Cov DS cov nyiaj ntau dua feem ntau ua rau cov dej solubility nce ntxiv thiab txo qis gelation kub. Kev ntsuas kev ntsuas piv txwv xws li resonance nuclear sib nqus sib nqus (NMR) spectroscopy thiab infrared (ir) spectroscopy feem ntau yog cov tshuaj lom neeg muaj pes tsawg leeg thiab DS ntawm HPMC kuaj.
2. Kev Txeeg:
Purity yog ib qho tseem ceeb ntawm HPMC zoo. Cov impurities tuaj yeem cuam tshuam kev ua yeeb yam thiab kev ruaj khov ntawm cov khoom. Cov kev cuam tshuam tsis zoo suav nrog cov kuab tshuaj uas muaj cov hlau, thiab cov microbants microbants. Ntau txoj kev analytical xws li kev ua kom zoo nkauj ua kua chromatography (GC), thiab lub icp-ms) tau siv los ntsuas qhov kev coj dawb huv ntawm HPMC.
3.Molecular hnyav:
Qhov hnyav molecular ntawm HPMC cuam tshuam nws cov khoom sib dhos, solubility, thiab zaj duab xis-tsim muaj peev xwm. Qhov hnyav dua molecular hnyav HPMC feem ntau ua rau muaj zog viscosity thiab lub zog zaj duab xis. Gel permation chromatography (GPC) yog cov txheej txheem siv dav dav rau kev txiav txim siab cov kev ntsuas HPMC ntawm HPMC.
4.vostrosity:
Viscosity yog ib qho chaw tsis muaj zog rau HPMC zoo, tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov, uas nws ua raws li tus neeg sawv cev tuab. Lub viscos txog ntawm HPMC cov kev daws teeb meem cuam tshuam los ntawm yam xws li kev xav tau, kub, thiab shear tus nqi. Ntau yam kev tawm tsam volcometric, suav nrog kev siv visiCometry thiab cov tshuaj tiv thaiv kab mob sib txawv, tau ua haujlwm los ntsuas kev tawm tsam HPMC ntawm cov xwm txheej sib txawv.
5.ph thiab dej noo:
Cov PHIC thiab noo noo cov ntsiab lus ntawm HPMC tuaj yeem cuam tshuam nws cov ruaj khov thiab sib xyaw nrog lwm cov khoom xyaw hauv cov qauv. Cov ntsiab lus noo yog qhov tshwj xeeb yog qhov tshwj xeeb yog cov dej noo ntau dhau tuaj yeem ua rau kev loj hlob microbial thiab kev tsis txaus ntseeg ntawm HPMC. Karl Fischer lub tsev pheebsuab siv los txiav txim cov ntsiab lus noo noo, thaum ua ntawv ntev ntev tau ua haujlwm rau kev ntsuas Ph.
6.Marticle loj thiab morphology:
Qhov loj me me thiab morphology ua si lub luag haujlwm tseem ceeb hauv kev ntws thiab qhov tawg ntawm HPMC hmoov. Cov tswv yim xws li laser diffraction thiab scaning electron metcopy (SEM) tau siv rau cov particle loj xa thiab morphology ntawm HPMC hais.
7.thermal cov yam ntxwv:
Thermal khoom xws li cov iav hloov cua kub (tg) thiab thermal degradation kub muab rau hauv kev ruaj khov thiab ua cov kev pabcuam ntawm HPMC. Cov tshuaj ntsuam xyuas kev sib txawv (DSC) thiab thermogravimetric tsom (TGA) feem ntau siv los tshawb xyuas lub thermal tus cwj pwm ntawm HPMC kuaj.
8.Gelation thiab Zaj Duab Xis Tsim:
Rau cov ntawv thov uas yuav tsum tau tsim los yog zaj duab xis tsim, gelation kub thiab ua yeeb yaj kiab-ua yeeb yaj kiab ntawm HPMC yog qhov tseem ceeb ntawm cov khoom tsis zoo. Rheatorical ntsuas thiab kev ntsuam xyuas cov yeeb yaj kiab ua yeeb yam los ntsuas cov khoom no raws li cov xwm txheej cuam tshuam.
Kev tshuaj xyuas qhov zoo ntawm hydroxypropyl cellulose (HPMC) tsis haum, viscosity loj, thiab cov yam ntxwv cua sov xws li gelation thiab zaj duab xis tsim. Ntau cov tswv yim txheeb xyuas tau ua haujlwm los ntsuas cov tsis sib xws, ua kom HPMC ua tau raws li cov ntawv thov uas yuav tsum tau ua. Los ntawm kev tswj cov qauv zoo, HPMC cov tuam txhab tuaj yeem ua kom muaj kev ua tau zoo, kev nyab xeeb, thiab kev ua haujlwm ntawm cov khoom lag luam thoob plaws kev lag luam.
Lub Sijhawm Post: Feb-18-2025