HydroxyPropyyl Metylcellulose (HPMC) yog cov tshuaj polymer ntau yam hauv ntau yam kev lag luam, suav nrog cov tshuaj, kev tsim kho, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce. Thaum txiav txim siab nws cov cua sov hluav taws xob, nws yog qhov tseem ceeb rau relve rau nws tus cwj pwm hais txog kev hloov pauv kub, cua sov, thiab muaj dab tsi cuam tshuam nrog kev tshwm sim.
Thermal Stability: HPMC cov khoom pov thawj zoo thermal stability hla ntau qhov kub. Nws feem ntau decomposes ntawm qhov kub, feem ntau ib nrab xyoo 200 ° C, nyob ntawm seb nws hnyav molecular, degree hloov chaw, thiab lwm yam. Cov txheej txheem degradation cuam tshuam nrog cov cleavage ntawm lub cellulose caj qaum thiab kev tso tawm ntawm cov khoom siv hluav taws xob tsis zoo.
Kev hloov pauv iav hloov (TG): HPMC undergoes ib qho iav hloov los ntawm ib lub iav hloov mus rau ib lub hnab rub tawm nrog kev nce kub. TG ntawm HPMC txawv nyob ntawm nws cov qib ntawm kev hloov chaw, hnyav hnyav, thiab cov ntsiab lus noo noo. Feem ntau, nws yog li ntawm 50 ° C txog 190 ° C. Saum toj no TG, HPMC tau yooj yim dua thiab ua kom pom kev muaj peev xwm ntau ntxiv.
Melting Taw tes: Ntshiab HPMC tsis muaj qhov txawv txav melted point vim tias nws yog amorphous polymer. Txawm li cas los xij, nws softens thiab tej zaum yuav ntws ntawm cov kub. Lub xub ntiag ntawm additives lossis impurities tuaj yeem cuam tshuam nws tus cwj pwm yaj.
Thermal conductivity: HPMC muaj cov thermal tsawg thermal conductivity piv rau cov hlau thiab qee cov polymers. Cov cuab yeej no ua rau nws haum rau cov ntawv thov uas xav tau cov rwb thaiv tsev thermal, xws li hauv cov ntsiav tshuaj lossis cov khoom siv hauv tsev.
Thermal nthuav dav: Zoo li cov polymers feem ntau, hpmc nthuav dav thaum ua kom sov thiab sib cog lus thaum txias. Cov coefficient ntawm thermal expansion (CTE) ntawm HPMC nyob ntawm yam zoo li nws cov tshuaj lom neeg thiab ua cov haujlwm. Feem ntau, nws muaj CTE hauv ntau yam ntawm 100 txog 300 ppm / ° C.
Muaj peev xwm ua kom sov: kev kub muaj cua sov ntawm HPMC yog cuam tshuam los ntawm nws cov qauv molecular, qib hloov chaw, thiab cov ntsiab lus noo noo. Nws feem ntau yog li ntawm 1.5 txog 2.5 j / g ° C. Qib siab dua ntawm kev hloov pauv thiab cov dej noo cov ntsiab lus feem ntxiv kom muaj peev xwm ua kom sov.
Thermal degradation: Thaum raug rau qhov kub rau lub sijhawm ntev, HPMC tuaj yeem yauv ua hluav taws xob thermal. Cov txheej txheem no tuaj yeem ua rau cov kev hloov pauv ntawm nws cov qauv tshuaj, ua rau cov khoom poob xws li cov viscosity thiab kev kho tshuab zog.
Thermal conductivity li: HPMC tuaj yeem hloov kho kom txhim kho nws cov thermal conductivity rau cov ntawv thov tshwj xeeb. Sib xyaw ua ke los yog cov quav ntxiv, xws li nws yog xim hlau hais lossis carbon nanotubes, tuaj yeem txhim kho cov khoom siv cua sov, ua kom haum rau cov ntawv thov kev tswj hwm cua sov.
Cov ntawv thov: To taub cov khoom cua sov ntawm HPMC yog qhov tseem ceeb rau kev ua kom ua tau zoo hauv ntau yam kev siv. Hauv cov chaw kuaj tshuaj, nws yog siv los ua cov binder, zaj duab xis yav tas los, thiab tus neeg sawv cev tso tawm hauv cov ntsiav tshuaj ua qauv. Hauv kev tsim kho, nws tau ua haujlwm hauv cov khoom siv Maa-raws los txhim kho kev ua haujlwm, adhesion, thiab dej khaws cia. Hauv cov zaub mov thiab cov tshuaj pleev ib ce, nws pabcuam ua cov tuab, stabilizer, thiab emulsifier.
HydroxyPropyyl methylulose (HPMC) ua rau cov cua sov ntawm cov khoom thermal uas ua rau nws haum rau cov ntawv thov sib txawv thoob plaws kev lag luam. Nws lub thermal stability, cua txias, thermal conductivity, thiab lwm yam ntxwv ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab ib puag ncig thiab kev siv. Nkag siab cov khoom no yog qhov tseem ceeb rau kev siv nyiaj zoo ntawm HPMC hauv ntau yam khoom thiab cov txheej txheem.
Lub Sijhawm Post: Lub Tsib Hlis-09-2024