Hydroxypropylmethylcellulose (HPMC) yog cov khoom siv polymer dav siv hauv ntau yam lag luam. Nws yog non-ionic cellulose ether, dej-soluble, tsis muaj tshuaj lom thiab tsis ua rau khaus. HPMC feem ntau yog siv los ua cov thickener, binder thiab emulsifier hauv ntau cov khoom noj, tshuaj thiab khoom tu tus kheej.
Ib qho ntawm cov khoom tseem ceeb ntawm HPMC yog nws qhov hnyav molecular, uas cuam tshuam rau nws cov viscosity. Viscosity yog ib qho kev ntsuas ntawm cov kua dej tsis kam ntws. Qhov siab dua qhov viscosity, cov kua dej ntau dua. Molecular hnyav yog ib qho kev ntsuas ntawm molecular loj, uas yog ncaj qha ntsig txog lub viscosity ntawm HPMC.
HPMC muaj nyob rau hauv ntau qib raws li nws qhov hnyav molecular. Lub viscosity ntawm HPMC nce nrog molecular hnyav. Lub viscosity ntawm HPMC kuj cuam tshuam los ntawm qib ntawm kev hloov pauv (DS), uas yog tus naj npawb ntawm hydroxypropyl thiab methyl pawg txuas nrog cov pob txha cellulose. Qhov siab dua DS, qhov siab dua qhov hnyav molecular thiab viscosity ntawm HPMC.
Lub viscosity ntawm HPMC kuj cuam tshuam los ntawm cov polymer concentration hauv cov tshuaj. Ntawm qhov tsis tshua muaj siab, cov saw hlau polymer yog dispersed thiab cov tshuaj viscosity tsawg. Raws li qhov concentration nce, cov saw hlau polymer pib sib tshooj thiab entangle, ua rau muaj kev nce ntxiv hauv viscosity. Qhov concentration ntawm cov saw hlau polymer pib sib tshooj yog hu ua overlap concentration.
Qhov hnyav molecular thiab viscosity ntawm HPMC yog qhov tseem ceeb hauv ntau cov khoom tsim. Hauv kev lag luam khoom noj khoom haus, HPMC yog siv los ua cov thickener rau cov kua ntses, hnav khaub ncaws thiab cov khoom ci. Qhov hnyav molecular thiab viscosity ntawm HPMC ua kom qhov xav tau kev ntxhib los mos thiab qhov ncauj qhov ncauj ntawm cov khoom kawg.
Hauv kev lag luam kws tshuaj, HPMC yog siv los ua cov ntawv khi rau cov ntsiav tshuaj thiab tshuaj ntsiav. Qhov hnyav molecular thiab viscosity ntawm HPMC txiav txim siab lub zog ntawm cov ntsiav tshuaj thiab nws lub peev xwm los yaj hauv plab hnyuv.
Hauv kev lag luam saib xyuas tus kheej, HPMC yog siv los ua cov thickener thiab emulsifier hauv tshuaj zawv plaub hau, tshuaj pleev thiab tshuaj pleev. Qhov tsim nyog molecular hnyav thiab viscosity ntawm HPMC xyuas kom meej qhov zoo sib xws thiab ruaj khov ntawm cov khoom.
Txhawm rau ua kom tiav, qhov hnyav molecular thiab viscosity ntawm HPMC yog qhov tseem ceeb uas cuam tshuam rau nws cov kev ua tau zoo hauv ntau qhov kev lag luam. Kev nkag siab txog kev sib raug zoo ntawm cov kev txwv no yog qhov tseem ceeb rau kev tsim cov khoom uas ua tau raws li qhov xav tau tshwj xeeb. HPMC yog ntau yam thiab muaj txiaj ntsig polymer uas pab txhim kho qhov zoo thiab ua haujlwm ntawm ntau yam khoom.
Post lub sij hawm: Lub Xya hli ntuj-18-2023