Hydroxypropyl methylcellulose, 28-30% methoxyl, 7-12% hydroxypropyl

Cov lus qhia tshwj xeeb "28-30% methoxyl" thiab "7-12% hydroxypropyl" hais txog qib ntawm kev hloov pauv hauvHydroxypropyl Methylcellulose(HPMC). Cov txiaj ntsig no qhia txog qhov uas cov thawj cellulose polymer tau hloov kho nrog methoxyl thiab hydroxypropyl pawg.

1. 28-30% Methoxyl:
   • Qhov no qhia tau hais tias, qhov nruab nrab, 28-30% ntawm thawj pawg hydroxyl ntawm cellulose molecule tau hloov nrog methoxyl pawg. Cov pab pawg Methoxyl (-OCH3) tau qhia los ua kom cov hydrophobicity ntawm cov polymer.
2. 7-12% Hydroxypropyl:
   • Qhov no qhia tau hais tias, qhov nruab nrab, 7-12% ntawm cov thawj hydroxyl pawg ntawm cellulose molecule tau hloov nrog hydroxypropyl pawg. Hydroxypropyl pawg (-OCH2CHOHCH3) tau qhia los txhim kho cov dej solubility thiab hloov lwm yam khoom ntawm lub cev thiab tshuaj lom neeg ntawm cov polymer.

Qib ntawm kev hloov pauv cuam tshuam rau cov khoom ntawm HPMC thiab nws qhov kev ua tau zoo hauv ntau daim ntawv thov. Piv txwv li:

• Cov ntsiab lus methoxyl ntau dua feem ntau ua rau cov polymer hydrophobicity, cuam tshuam rau nws cov dej solubility thiab lwm yam khoom.
• Cov ntsiab lus hydroxypropyl ntau dua tuaj yeem txhim kho cov dej solubility thiab ua cov yeeb yaj kiab ntawm HPMC.

Cov kev qhia tshwj xeeb no yog qhov tseem ceeb hauv kev txiav HPMC kom tau raws li cov kev cai tshwj xeeb hauv kev lag luam sib txawv. Piv txwv li, hauv kev lag luam kws tshuaj, kev xaiv ntawm HPMC qib nrog cov qib tshwj xeeb ntawm kev hloov pauv tuaj yeem cuam tshuam rau cov tshuaj tso tawm cov ntaub ntawv hauv cov tshuaj ntsiav tshuaj. Hauv kev tsim kho kev lag luam, nws tuaj yeem cuam tshuam cov dej tuav thiab adhesion ntawm cov khoom siv cement.

Cov neeg tsim khoom tsim ntau qib ntawm HPMC nrog cov qib sib txawv ntawm kev hloov pauv kom tau raws li cov kev xav tau sib txawv ntawm cov ntawv thov sib txawv. Thaum siv HPMC hauv formulations, nws yog ib qho tseem ceeb rau cov formulations los txiav txim siab txog qib tshwj xeeb ntawm HPMC uas ua raws li cov khoom xav tau thiab cov yam ntxwv ua tau zoo rau daim ntawv thov.