Hydroxypropylmethylcellulose (HPMC) yog ib qho polymer uas siv tau ntau yam thiab muaj ntau yam uas yog los ntawm tsev neeg cellulose ether. Nws yog synthesized los ntawm ntau yam tshuaj lom neeg los ntawm kev hloov kho cellulose ntuj, ib qho tseem ceeb ntawm cov phab ntsa cell ntawm cov nroj tsuag. Cov HPMC uas tshwm sim muaj cov khoom tshwj xeeb uas ua rau nws muaj txiaj ntsig thoob plaws hauv kev lag luam.
1. Cov qauv tshuaj lom neeg thiab cov qauv sib xyaw:
HPMC yog muab los ntawm cellulose, uas muaj cov chav glucose rov ua dua txuas nrog β-1,4-glycosidic bonds. Los ntawm kev hloov kho tshuaj lom neeg, hydroxypropyl thiab methoxy pawg raug qhia rau hauv cellulose backbone. Qib ntawm kev hloov pauv (DS) ntawm hydroxypropyl thiab methoxy pawg yuav txawv, ua rau muaj ntau qib ntawm HPMC nrog cov khoom sib txawv.
Cov qauv tshuaj ntawm HPMC muab nws cov solubility thiab gel-forming peev xwm, ua rau nws muaj txiaj ntsig zoo hauv ntau yam kev siv thoob plaws ntau yam kev lag luam.
2. Kev yaj thiab cov khoom rheological:
Ib qho ntawm cov yam ntxwv tseem ceeb ntawm HPMC yog nws cov solubility hauv dej, ua rau nws yog cov polymer uas yaj tau hauv dej. HPMC tsim cov tshuaj ntshiab thiab viscous thaum yaj hauv dej, thiab nws cov khoom rheological tuaj yeem hloov kho los ntawm kev hloov qhov hnyav molecular thiab qib ntawm kev hloov pauv. Qhov kev hloov pauv thiab rheology no ua rau HPMC haum rau ntau yam kev siv.
3. Kev ua yeeb yaj kiab:
HPMC muaj cov yam ntxwv zoo heev rau kev tsim cov zaj duab xis thiab tuaj yeem tsim cov zaj duab xis yooj ywm thaum cov polymer yaj hauv dej. Cov yam ntxwv no pom muaj nyob rau hauv kev siv hauv kev lag luam tshuaj thiab khoom noj rau kev txheej cov ntsiav tshuaj, encapsulating saj thiab muab cov yam ntxwv thaiv hauv cov zaj duab xis noj tau.
4. Cov ntawv thov kho mob:
HPMC siv dav hauv kev lag luam tshuaj vim nws muaj ntau yam khoom siv. Nws siv rau hauv cov tshuaj ntsiav ua tus binder, disintegrant, zaj duab xis-tsim tus neeg sawv cev thiab tus neeg sawv cev tso tawm tas mus li. Lub peev xwm ntawm cov polymer los tswj kev tso tawm tshuaj thiab txhim kho kev ruaj khov ntawm cov tshuaj ua rau nws yog ib qho khoom xyaw tseem ceeb hauv kev tsim ntau yam tshuaj noj.
5. Kev lag luam tsim kho:
Hauv kev lag luam kev tsim kho, HPMC siv dav ua tus neeg sawv cev ua kom tuab, tus neeg sawv cev khaws dej thiab ua kom muaj peev xwm ua haujlwm tau zoo hauv cov khoom siv cement xws li mortars, grouts thiab plasters. Nws cov khoom rheological pab txhim kho kev ua haujlwm tau zoo, tiv taus sag thiab lo, ua rau nws yog ib qho tseem ceeb ntxiv rau hauv cov ntaub ntawv tsim kho.
6. Khoom noj thiab tshuaj pleev ib ce:
Hauv kev lag luam zaub mov, HPMC siv ua cov khoom ua kom tuab, emulsifier, thiab stabilizer hauv ntau yam khoom, suav nrog cov kua ntses, cov khoom qab zib, thiab cov khoom noj mis nyuj. Nws tsis muaj tshuaj lom thiab muaj peev xwm tsim cov gels ntshiab ua rau nws haum rau kev siv zaub mov.
Ib yam li ntawd, hauv kev lag luam tshuaj pleev ib ce, HPMC siv rau hauv cov qauv xws li tshuaj pleev, tshuaj pleev ib ce, thiab tshuaj zawv plaub hau vim nws cov khoom ua kom tuab, ruaj khov, thiab ua zaj duab xis. Nws pab txhawb rau qhov zoo nkauj, viscosity thiab ruaj khov ntawm cov tshuaj pleev ib ce.
7. Xim thiab Txheej Txheem:
HPMC siv ua cov khoom ua kom tuab thiab hloov kho rheology hauv cov xim thiab cov txheej txheej uas muaj dej. Nws txhim kho cov yam ntxwv ntawm kev siv cov txheej, xws li kev pleev xim thiab kev tiv thaiv dej txaws, thaum tseem txhim kho kev ua tau zoo ntawm cov txheej.
8. Cov nplaum:
Hauv cov qauv nplaum, HPMC ua haujlwm ua tus neeg sawv cev ua kom tuab thiab khaws dej. Nws lub peev xwm los tswj qhov viscosity thiab txhim kho kev nplaum ua rau nws muaj txiaj ntsig zoo hauv kev tsim cov nplaum hauv ntau yam lag luam, suav nrog kev ua haujlwm ntoo thiab kev sib txuas ntawv.
9. Kev tswj hwm kev tso tawm:
Kev tswj hwm kev tso tawm cov khoom xyaw nquag yog qhov tseem ceeb rau ntau yam lag luam, suav nrog cov tshuaj thiab kev ua liaj ua teb. HPMC feem ntau siv los tsim cov txheej txheem tswj kev tso tawm vim nws muaj peev xwm tsim ib lub matrix uas tswj qhov kev tso tawm ntawm cov tshuaj encapsulated dhau sijhawm.
10. Cov ntawv thov kho mob biomedical:
Hauv cov teb ntawm biomedicine thiab tissue engineering, HPMC tau raug tshawb nrhiav rau nws cov biocompatibility thiab lub peev xwm los tsim hydrogels. Cov hydrogels no tuaj yeem siv rau hauv kev xa tshuaj, kho qhov txhab, thiab cov ntaub ntawv rov ua dua tshiab.
11. Cov yam ntxwv tiv thaiv ib puag ncig:
HPMC suav hais tias yog ib puag ncig zoo vim nws tau los ntawm cov khoom siv rov ua dua tshiab thiab yog biodegradable. Nws siv rau hauv ntau yam kev siv yog raws li qhov kev thov loj hlob rau cov khoom siv ruaj khov thiab zoo rau ib puag ncig.
12. Tej Yam Uas Yuav Tsum Tau Ua thiab Tej Yam Uas Yuav Tsum Tau Xav Txog:
Txawm hais tias HPMC siv dav dav, muaj ntau yam teeb meem, suav nrog nws qhov kev rhiab heev rau qhov kub thiab txias, uas cuam tshuam rau nws cov khoom gel. Tsis tas li ntawd, cov txheej txheem kev nrhiav thiab kev hloov pauv tshuaj ntawm cellulose yuav tsum tau xav txog zoo los ntawm kev xav txog ib puag ncig thiab kev ruaj khov.
13. Kev Ua Raws Cai:
Ib yam li cov khoom siv hauv tshuaj, khoom noj thiab lwm yam khoom siv rau cov neeg siv khoom, nws yog ib qho tseem ceeb uas cov qauv uas cov koom haum tswj hwm tau teeb tsa yuav tsum ua raws li. HPMC feem ntau ua tau raws li cov kev cai tswjfwm, tab sis cov chaw tsim khoom yuav tsum xyuas kom ua raws li cov lus qhia tshwj xeeb rau txhua daim ntawv thov.
xaus lus:
Hydroxypropylmethylcellulose (HPMC) yog ib hom polymer uas siv tau ntau yam hauv ntau yam lag luam. Nws txoj kev sib xyaw ua ke ntawm kev yaj, cov khoom ua zaj duab xis thiab kev tswj hwm rheology ua rau nws tsis tseem ceeb hauv kev lag luam tshuaj, kev tsim kho, khoom noj, tshuaj pleev ib ce, xim, nplaum thiab ntau ntxiv. Raws li kev lag luam txuas ntxiv nrhiav kev daws teeb meem ruaj khov thiab zoo, HPMC yuav tseem yog tus neeg ua si tseem ceeb hauv ntau yam khoom sib txawv. Txawm hais tias muaj qee qhov kev cov nyom, kev tshawb fawb thiab kev nce qib hauv cellulose chemistry tuaj yeem nthuav dav cov ntawv thov thiab txhim kho kev ua tau zoo ntawm HPMC yav tom ntej.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-28-2023