Hydroxypropyl methylcellulose (HPMC) yog ib hom polymer uas siv tau ntau yam hauv ntau yam lag luam, suav nrog tshuaj, khoom noj, kev tsim kho, thiab tshuaj pleev ib ce. Thaum xav txog nws cov khoom siv thermal, nws yog ib qho tseem ceeb uas yuav tsum kawm txog nws tus cwj pwm txog kev hloov pauv kub, kev ruaj khov thermal, thiab lwm yam xwm txheej cuam tshuam.
Kev Ruaj Ntseg Thermal: HPMC ua kom pom kev ruaj ntseg zoo ntawm qhov kub thiab txias dav dav. Nws feem ntau lwj thaum kub siab, feem ntau siab dua 200 ° C, nyob ntawm nws qhov hnyav molecular, qib kev hloov pauv, thiab lwm yam. Cov txheej txheem rhuav tshem cuam tshuam nrog kev txiav ntawm cov cellulose backbone thiab tso tawm cov khoom tawg yooj yim.
Kub Hloov Iav (Tg): Ib yam li ntau cov polymers, HPMC dhau los ntawm kev hloov iav los ntawm lub xeev iav mus rau lub xeev roj hmab nrog qhov kub nce ntxiv. Tg ntawm HPMC sib txawv nyob ntawm nws qib kev hloov pauv, qhov hnyav molecular, thiab cov dej noo. Feem ntau, nws nyob ntawm 50 ° C txog 190 ° C. Saum toj no Tg, HPMC dhau los ua qhov yooj ywm dua thiab qhia txog kev txav mus los ntawm molecular ntau dua.
Melting Point: HPMC ntshiab tsis muaj qhov melting point sib txawv vim nws yog ib qho polymer amorphous. Txawm li cas los xij, nws mos thiab tuaj yeem ntws ntawm qhov kub siab. Qhov muaj cov khoom ntxiv lossis cov khoom tsis huv tuaj yeem cuam tshuam rau nws tus cwj pwm yaj.
Kev Ua Kub: HPMC muaj kev ua kub qis dua piv rau cov hlau thiab qee cov polymers. Cov yam ntxwv no ua rau nws haum rau cov ntawv thov uas xav tau kev rwb thaiv tsev, xws li hauv cov ntsiav tshuaj tshuaj lossis cov ntaub ntawv tsim kho.
Kev Nthuav Dav Thermal: Ib yam li feem ntau cov polymers, HPMC nthuav dav thaum cua sov thiab cog lus thaum txias. Tus coefficient ntawm thermal expansion (CTE) ntawm HPMC nyob ntawm cov yam xws li nws cov tshuaj lom neeg thiab cov xwm txheej ua tiav. Feem ntau, nws muaj CTE hauv qhov ntau ntawm 100 txog 300 ppm / ° C.
Peev Xwm Kub: Lub peev xwm kub ntawm HPMC yog cuam tshuam los ntawm nws cov qauv molecular, qib ntawm kev hloov pauv, thiab cov dej noo. Nws feem ntau yog li ntawm 1.5 txog 2.5 J / g ° C. Cov qib siab dua ntawm kev hloov pauv thiab cov dej noo feem ntau ua rau lub peev xwm kub nce ntxiv.
Kev puas tsuaj ntawm thermal: Thaum raug rau qhov kub siab rau lub sijhawm ntev, HPMC yuav raug kev puas tsuaj ntawm thermal. Cov txheej txheem no tuaj yeem ua rau muaj kev hloov pauv hauv nws cov qauv tshuaj lom neeg, ua rau poob ntawm cov khoom xws li viscosity thiab lub zog kho tshuab.
Kev Txhim Kho Kev Ua Kub: HPMC tuaj yeem hloov kho kom txhim kho nws cov kev ua kub rau cov ntawv thov tshwj xeeb. Kev suav nrog cov khoom sau lossis cov khoom ntxiv, xws li cov khoom me me lossis cov pa roj carbon nanotubes, tuaj yeem txhim kho cov khoom hloov pauv cua sov, ua rau nws tsim nyog rau kev siv tswj kev ua kub.
Daim Ntawv Thov: Kev nkag siab txog cov khoom siv thermal ntawm HPMC yog qhov tseem ceeb rau kev ua kom zoo dua nws siv hauv ntau yam kev siv. Hauv kev lag luam tshuaj, nws yog siv los ua tus binder, zaj duab xis, thiab tus neeg sawv cev tso tawm tas mus li hauv cov qauv ntsiav tshuaj. Hauv kev tsim kho, nws yog siv rau hauv cov ntaub ntawv cement-based los txhim kho kev ua haujlwm, kev nplaum, thiab kev khaws dej. Hauv cov khoom noj thiab cov tshuaj pleev ib ce, nws ua haujlwm ua tus thickener, stabilizer, thiab emulsifier.
Hydroxypropyl methylcellulose (HPMC) muaj ntau yam khoom siv thermal uas ua rau nws haum rau ntau yam kev siv thoob plaws hauv kev lag luam. Nws qhov kev ruaj khov thermal, qhov kub hloov iav, thermal conductivity, thiab lwm yam ntxwv ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab nws cov kev ua tau zoo hauv cov chaw ib puag ncig thiab cov ntawv thov tshwj xeeb. Kev nkag siab txog cov khoom no yog qhov tseem ceeb rau kev siv HPMC zoo hauv ntau yam khoom thiab cov txheej txheem.
Lub sijhawm tshaj tawm: Tsib Hlis-09-2024