Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer uas muaj ntau yam khoom siv hydrophobic thiab hydrophilic, ua rau nws tshwj xeeb hauv ntau yam kev siv thoob plaws ntau yam lag luam. Yuav kom nkag siab txog hydrophobicity thiab hydrophilicity ntawm HPMC, peb yuav tsum kawm txog nws cov qauv, cov khoom thiab cov ntawv thov kom tob.
Cov qauv ntawm hydroxypropyl methylcellulose:
HPMC yog ib qho derivative ntawm cellulose, ib qho polymer ntuj pom nyob rau hauv cov nroj tsuag cell phab ntsa. Kev hloov kho ntawm cellulose cuam tshuam nrog kev qhia txog hydroxypropyl thiab methyl pawg rau hauv cellulose backbone. Qhov kev hloov kho no hloov cov khoom ntawm cov polymer, muab cov khoom tshwj xeeb uas muaj txiaj ntsig zoo rau ntau yam kev siv.
Hydrophilicity ntawm HPMC:
Hydroxy:
HPMC muaj cov pab pawg hydroxypropyl thiab yog hydrophilic. Cov pab pawg hydroxyl no muaj kev sib raug zoo rau cov dej molecules vim yog hydrogen bonding.
Pawg Hydroxypropyl tuaj yeem tsim cov hydrogen bonds nrog cov dej molecules, ua rau HPMC yaj hauv dej mus rau qee qhov.
methyl:
Txawm hais tias pawg methyl pab txhawb rau qhov hydrophobicity tag nrho ntawm lub molecule, nws tsis tawm tsam qhov hydrophilicity ntawm pawg hydroxypropyl.
Pawg methyl tsis yog polar, tab sis qhov muaj nyob ntawm pawg hydroxypropyl txiav txim siab tus cwj pwm hydrophilic.
Hydrophobicity ntawm HPMC:
methyl:
Cov pab pawg methyl hauv HPMC txiav txim siab qee yam nws cov hydrophobicity.
Txawm hais tias tsis yog hydrophobic zoo li qee cov polymers hluavtaws tag nrho, qhov muaj cov pab pawg methyl txo qhov hydrophilicity ntawm HPMC.
Cov yam ntxwv ntawm zaj duab xis:
HPMC paub txog nws cov khoom ua zaj duab xis thiab feem ntau siv rau hauv kev siv tshuaj thiab kev kho kom zoo nkauj. Hydrophobicity pab txhawb rau kev tsim cov zaj duab xis tiv thaiv.
Kev sib cuam tshuam nrog cov khoom tsis yog polar:
Hauv qee daim ntawv thov, HPMC tuaj yeem cuam tshuam nrog cov tshuaj tsis-polar vim nws qhov hydrophobicity ib nrab. Cov khoom no yog qhov tseem ceeb rau cov txheej txheem xa tshuaj hauv kev lag luam tshuaj.
Cov ntawv thov ntawm HPMC:
tshuaj:
HPMC siv dav hauv cov tshuaj ua cov khoom siv khi, ua zaj duab xis, thiab hloov kho viscosity. Nws lub peev xwm tsim zaj duab xis ua rau kev tswj hwm kev tso tawm ntawm cov tshuaj.
Nws yog siv rau hauv cov ntawv kho mob xws li cov ntsiav tshuaj thiab cov tshuaj ntsiav.
Kev lag luam tsim kho:
Hauv kev tsim kho, HPMC siv rau hauv cov khoom siv cement los txhim kho kev ua haujlwm, kev khaws dej thiab kev nplaum.
Hydrophilicity pab khaws dej, thaum hydrophobicity pab txhim kho adhesion.
kev lag luam zaub mov:
HPMC siv ua cov khoom ua kom tuab thiab ua kom gelling hauv kev lag luam zaub mov. Nws cov yam ntxwv hydrophilic pab tsim cov gels ruaj khov thiab tswj qhov viscosity ntawm cov khoom noj.
kev zoo nkauj:
Hauv cov qauv tshuaj pleev ib ce, HPMC siv rau hauv cov khoom xws li tshuaj pleev thiab tshuaj pleev vim nws cov khoom ua zaj duab xis thiab cov khoom tuab.
Hydrophilicity ua kom cov tawv nqaij noo zoo.
xaus lus:
HPMC yog ib qho polymer uas yog ob qho tib si hydrophilic thiab hydrophobic. Qhov sib npaug ntawm hydroxypropyl thiab methyl pawg hauv nws cov qauv ua rau nws muaj qhov tshwj xeeb versatility, ua rau nws muaj ntau yam kev siv. Kev nkag siab txog cov khoom no yog qhov tseem ceeb rau kev kho HPMC rau kev siv tshwj xeeb hauv ntau yam lag luam, qhov twg lub peev xwm ntawm HPMC los cuam tshuam nrog dej thiab cov tshuaj nonpolar siv rau ntau yam lub hom phiaj.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-15-2023