HydroxyPropyyl methylcellueculose (HPMC) yog qhov ntau thiab dav siv polymer hauv ntau yam kev lag luam, paub txog nws cov khoom ntiag tug thiab kev siv. Qhov no sib xyaw no yog ib qho tseem ceeb ntawm cellulose, lub ntuj polymer pom hauv tsob ntoo cell phab ntsa. Txhawm rau kom nkag siab cov muaj pes tsawg leeg ntawm hydroxyprropyloosulose, nws yog ib qho tsim nyog los delve rau hauv cov qauv thiab synthesis ntawm no derivose no.
Tus qauv ntawm cellulose:
Cellulose yog cov carbohydrate uas nyuaj ua ke ntawm cov kab saw hlau ntawm β-d-faam pawg sib txuas los ntawm β-1-glycosidic bonds. Cov saw hlau zoo no tau sib koom ua ke los ntawm hydrogen bonds los ua ib hom qauv sib zog. Cellulose yog cov txheej txheem tseem ceeb ntawm cov nroj tsuag cell phab ntsa, muab lub zog thiab nruj rau cov nroj tsuag.
Derivatives ntawm hydroxypropyl methylulose:
HydroxyPropyyl methylulose yog synthesized los ntawm kev siv cellulge thiab me me mutterdropyl thiab methyl pawg rau hauv lub ntsiab saw ntawm cellulose. Ntau lawm feem ntau suav nrog cov kauj ruam hauv qab no:
Ethetification tiv thaiv:
Methylation: Kho cellulose nrog ib qho alkaline tov thiab methyl chloride los qhia methyl pawg (-oh) ntawm cov cellulose.
HydroxyPropation: Methylated Cellulose ntxiv cov tshuaj tiv thaiv nrog prinylene oxide los qhia hydroxypropylropyl pab pawg. Tus txheej txheem no txhim kho cov dej solubility thiab hloov lub zog ntawm lub cev ntawm cellulose.
Purification:
Lub cellulose hloov pauv yog tom qab ntxuav kom tshem tawm cov reagents, los ntawm cov khoom lag luam lossis cov khoom siv hluav taws xob.
Kom qhuav thiab sib tsoo:
Lub lim dej hydroxypropyl methylpcellulose tau qhuav thiab hauv av mus rau hauv cov hmoov zoo rau kev siv hauv ntau cov ntawv thov.
Cov khoom xyaw ntawm hydroxypropal methylcellose:
Cov muaj pes tsawg leeg ntawm hydroxypropyf methylcellose los ntawm cov qib kev hloov pauv, uas yog hais txog cov pab pawg hydroxyl Cov qib sib txawv ntawm HPMC muaj cov qib sib txawv ntawm kev hloov pauv, cuam tshuam rau lawv solubility, viscosity thiab lwm yam khoom.
Tshuaj mis ntawm cov miskaspropyl methyllopulose tau yog (C6h7o2 (Oh) 3-Auj (OC) _x, qhov twg m thiab n sawv daws cov degree hloov chaw.
M: Qib ntawm methylation (methyl pawg ib chav dej qab zib)
N: Qib ntawm HydroxyPropy (Hydroxypropylropyl ib chav dej qab zib)
X: Tus naj npawb ntawm cov dej qab zib hauv lub cellulose saw
Nta thiab cov ntawv thov:
Solubility: HPMC yog dej-soluble, thiab cov qib hloov pauv cuam tshuam rau nws cov yam ntxwv solubility. Nws tsim cov tshuaj kom pom tseeb thiab pleev xim rau hauv dej, ua rau nws haum rau ntau yam qauv.
Viscosity: lub viscosity ntawm HPMC tov nyob ntawm cov yam xws li kev hnyav molecular thiab qib hloov chaw. Cov cuab yeej no yog qhov tseem ceeb rau cov ntawv thov xws li cov kws tshuaj uas yuav tsum tau muab cov yeeb yaj kiab tso tawm.
Zaj duab xis tsim: HPMC tuaj yeem ua cov yeeb yaj kiab nyias raws li cov tshuaj dries, ua rau nws muaj txiaj ntsig nyob rau hauv cov txheej txheem, zaub mov thiab lwm yam kev lag luam.
Stabilizers thiab cov tuab: hauv kev lag luam khoom noj khoom haus, HPMC yog siv los ua cov khoom siv ua kom khov thiab muaj kuab, suav nrog cov kua ntses, cov khoom qab zib, thiab cov khoom ci.
Cov ntawv thov tshuaj: HPMC tau dav hauv cov tshuaj yeeb yaj kiab, suav nrog cov ntsiav tshuaj, tshuaj ntsiav, vim nws cov kev tso tawm ntawm cov khoom siv thiab biocompatibility.
Kev tsim kho thiab cov txheej txheem HPMC yog siv rau hauv cov khoom tsim kho xws li Mortars, cov nplaum nplaum thiab plasters. Nws tseem raug siv los ua cov tuab thiab khov kho hauv cov xim pleev xim thiab txheej txheem txheej txheem.
Cov khoom siv saib xyuas tus kheej: Hauv kev saib xyuas tshuaj pleev thiab kev lag luam kev saib xyuas tus kheej, tshuaj pleev li tshuaj thiab tshuaj zawv plaub hau, qhov uas nws muab kev ruaj khov.
HydroxyPropyyl methylulose tau txais los ntawm methylation thiab hydroxyproperylation ntawm cellulose. Nws yog ntau lub hom phiaj polymer nrog ntau yam ntawm kev siv. Nws cov khoom tshwj xeeb ua rau nws muaj txiaj ntsig zoo hauv kev lag luam xws li cov tshuaj, khoom noj khoom haus, tsim kho thiab kev saib xyuas tus kheej. Tswj kev hloov kho ntawm cellulose tuaj yeem zoo-tune cov khoom ntawm HPMC, ua rau nws tseem ceeb ntawm ntau cov khoom peb tau ntsib hauv peb lub neej niaj hnub.
Lub Sijhawm Post: Jan-10-2024