Qhov txawv ntawm EHEC thiab HPMC

EHEC thiab HPMC yog ob hom kev siv polymers uas muaj cov qauv tshuaj sib txawv thiab cov khoom sib txawv. EHEC sawv cev rau ethyl hydroxyethyl cellulose, thaum HPMC sawv cev rau hydroxypropyl methylcellulose. Hauv tsab xov xwm no, peb yuav tham txog qhov sib txawv ntawm EHEC thiab HPMC hais txog lawv cov qauv tshuaj, khoom siv, kev siv, thiab kev nyab xeeb.

1. Chemical Structure

EHEC yog cov dej-soluble polymer uas tau los ntawm cellulose. Nws yog ib qho kev hloov kho cellulose ether uas muaj ob pawg ethyl thiab hydroxyethyl txuas rau hauv cov pob txha cellulose. Qhov degree ntawm kev hloov pauv (DS) ntawm EHEC yog hais txog tus naj npawb ntawm ethyl thiab hydroxyethyl pawg uas muaj nyob rau hauv ib chav tsev anhydroglucose (AGU) ntawm cov pob txha cellulose. DS ntawm EHEC tuaj yeem nyob ntawm 0.2 txog 2.5, nrog rau cov txiaj ntsig DS siab dua qhia tau tias muaj kev hloov pauv ntau dua.

HPMC, ntawm qhov tod tes, kuj yog cov dej-soluble polymer uas tau muab los ntawm cellulose. Nws yog ib qho kev hloov kho cellulose ether uas muaj ob pawg hydroxypropyl thiab methyl txuas rau hauv cov pob txha cellulose. Qib ntawm kev hloov pauv ntawm HPMC yog hais txog tus naj npawb ntawm hydroxypropyl thiab methyl pawg uas muaj nyob rau hauv AGU ntawm cov pob txha cellulose. DS ntawm HPMC tuaj yeem nyob ntawm 0.1 txog 3.0, nrog rau cov txiaj ntsig DS siab dua qhia tau tias muaj kev hloov pauv ntau dua.

2. Cov khoom

EHEC thiab HPMC muaj cov khoom sib txawv uas ua rau lawv haum rau kev siv sib txawv. Qee qhov tseem ceeb ntawm EHEC thiab HPMC muaj nyob hauv qab no:

ib. Solubility: EHEC tsawg soluble hauv dej dua HPMC, thiab nws solubility txo qis raws li qib ntawm kev hloov pauv nce. HPMC, ntawm qhov tod tes, yog soluble hauv dej.

b. Rheology: EHEC yog cov khoom siv pseudoplastic, uas txhais tau hais tias nws nthuav tawm tus cwj pwm shear thinning. Qhov no txhais tau hais tias cov viscosity ntawm EHEC txo qis raws li tus nqi shear nce. HPMC, ntawm qhov tod tes, yog cov khoom siv Newtonian, uas txhais tau hais tias nws cov viscosity tseem nyob tas li tsis hais tus nqi txiav.

c. Zaj duab xis-forming zog: EHEC muaj zoo zaj duab xis-forming zog, uas ua rau nws haum rau siv nyob rau hauv coatings thiab films. HPMC kuj muaj cov khoom ua yeeb yaj kiab, tab sis cov yeeb yaj kiab yuav nkig thiab ua rau tawg.

d. Stability: EHEC ruaj khov nyob rau ntau yam ntawm pH thiab kub kub. HPMC kuj tseem ruaj khov nyob rau ntau qhov pH, tab sis nws qhov kev ruaj ntseg yuav cuam tshuam los ntawm qhov kub thiab txias.

3. Siv

EHEC thiab HPMC tau siv dav hauv ntau daim ntawv thov hauv kev lag luam zaub mov, tshuaj, thiab kev saib xyuas tus kheej. Qee qhov kev siv tseem ceeb ntawm EHEC thiab HPMC tau teev tseg hauv qab no:

ib. Kev lag luam zaub mov: EHEC feem ntau yog siv los ua cov thickener, stabilizer, thiab emulsifier hauv cov khoom noj xws li kua ntses, hnav khaub ncaws, thiab cov khoom ci. HPMC kuj tseem siv los ua cov thickener thiab stabilizer hauv cov khoom noj khoom haus, tab sis feem ntau yog siv los ua cov txheej txheem rau cov khoom qab zib xws li gummy candies thiab chocolates.

b. Kev lag luam kws tshuaj: EHEC yog siv los ua ib qho kev sib khi, disintegrant, thiab ntsiav tshuaj txheej tus neeg sawv cev hauv cov tshuaj formulations. HPMC kuj tseem siv tau los ua ib qho kev sib khi, disintegrant, thiab ntsiav tshuaj txheej tus neeg sawv cev hauv cov tshuaj formulations, tab sis nws yog feem ntau siv los ua tus neeg saib xyuas kev tso tawm.

4. Kev nyab xeeb

EHEC thiab HPMC feem ntau suav hais tias muaj kev nyab xeeb rau kev siv khoom noj thiab tshuaj siv. Txawm li cas los xij, zoo li txhua yam tshuaj lom neeg, tej zaum yuav muaj qee qhov kev pheej hmoo cuam tshuam nrog lawv siv.