Nkag siab txog HPMC Chemical Structure

HPMC, los yog hydroxypropyl methylcellulose, yog cellulose-based polymer uas tau siv dav hauv ntau qhov kev lag luam suav nrog tshuaj, tshuaj pleev ib ce, thiab khoom noj khoom haus.Kev nkag siab txog cov qauv tshuaj ntawm HPMC yog qhov tseem ceeb rau kev txhim kho nws cov khoom thiab kev ua tau zoo hauv kev siv sib txawv.

Cov qauv tshuaj ntawm HPMC yog tsim los ntawm ob yam tseem ceeb: cellulose qaum thiab hydroxypropyl thiab methyl substituents.

Cellulose yog ib txwm tshwm sim polymer tsim los ntawm cov piam thaj monomers txuas ua ke los ntawm glycosidic bonds.Cov pob txha cellulose ntawm HPMC yog muab los ntawm cov ntoo pulp lossis paj rwb linters, uas dhau los ntawm kev hloov kho tshuaj los tsim cov dej-soluble polymer.

Cov hydroxypropyl thiab methyl substituents tau ntxiv rau hauv cov pob txha cellulose los txhim kho cov solubility thiab kev ua haujlwm ntawm HPMC.Hydroxypropyl pawg yog ntxiv los ntawm reacting propylene oxide nrog cellulose qaum, thaum methyl pawg ntxiv los ntawm reacting methanol nrog cov hydroxypropyl pawg.

Qib ntawm kev hloov pauv (DS) ntawm HPMC yog hais txog tus naj npawb ntawm hydroxypropyl thiab methyl pawg uas tau ntxiv rau hauv cov pob txha cellulose.DS tuaj yeem sib txawv raws li daim ntawv thov tshwj xeeb thiab cov cai ntawm HPMC.HPMC nrog DS siab dua yuav muaj ntau dua solubility thiab viscosity, thaum HPMC nrog DS qis dua yuav muaj qis solubility thiab viscosity.

HPMC feem ntau siv los ua cov thickener, emulsifier, thiab stabilizer hauv ntau daim ntawv thov vim nws cov khoom tshwj xeeb.Nws yog dej-soluble, non-toxic, thiab biodegradable, ua rau nws yog ib qho kev ntxim nyiam rau lwm cov khoom siv hluavtaws.Tsis tas li ntawd, cov txheej txheem kev hloov kho tshuaj siv los tsim HPMC tso cai rau kev tswj hwm nws cov khoom, ua rau nws muaj ntau yam polymer rau ntau yam kev siv.

Hauv cov ntsiab lus, kev nkag siab txog cov qauv tshuaj ntawm HPMC yog qhov tseem ceeb rau kev txhim kho nws cov khoom thiab kev ua tau zoo hauv kev siv sib txawv.Cov pob txha cellulose thiab hydroxypropyl thiab methyl substituents ua cov khoom tseem ceeb ntawm HPMC, thiab qib ntawm kev hloov pauv tuaj yeem sib txawv nyob ntawm daim ntawv thov tshwj xeeb.HPMC cov khoom tshwj xeeb ua rau nws muaj ntau yam thiab txaus nyiam polymer rau ntau yam kev lag luam sib txawv.