Cov Yam Tseem Ceeb Uas Cuam Tshuam Rau Kev Khaws Dej Ntawm HPMC

Hydroxypropylmethylcellulose (HPMC), ua ib qho polymer hydrophilic uas siv ntau hauv kev lag luam tshuaj, yog siv dav hauv cov tshuaj pleev xim, cov tshuaj tso tawm tswj thiab lwm yam kev xa tshuaj. Ib qho ntawm cov yam ntxwv tseem ceeb ntawm HPMC yog nws lub peev xwm khaws dej, uas cuam tshuam rau nws cov kev ua tau zoo ua ib qho tshuaj ntxiv. Hauv tsab xov xwm no, peb yuav tshawb nrhiav cov yam tseem ceeb uas cuam tshuam rau kev khaws dej ntawm HPMC, suav nrog qhov hnyav molecular, hom kev hloov pauv, kev sib xyaw, thiab pH.

qhov hnyav molecular

Qhov hnyav molecular ntawm HPMC ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab nws lub peev xwm khaws dej. Feem ntau, qhov hnyav molecular siab HPMC yog hydrophilic ntau dua li qhov hnyav molecular qis HPMC thiab tuaj yeem nqus dej ntau dua. Qhov no yog vim tias qhov hnyav molecular siab dua HPMCs muaj cov saw ntev dua uas tuaj yeem sib txuas thiab tsim cov network dav dua, ua rau cov dej ntau ntxiv uas tuaj yeem nqus tau. Txawm li cas los xij, nws yuav tsum tau sau tseg tias qhov hnyav molecular siab dhau HPMC yuav ua rau muaj teeb meem xws li viscosity thiab kev ua haujlwm nyuaj.

lwm txoj kev xaiv

Lwm yam uas cuam tshuam rau lub peev xwm khaws dej ntawm HPMC yog hom kev hloov pauv. HPMC feem ntau muaj ob hom: hydroxypropyl-substituted thiab methoxy-substituted. Hom hydroxypropyl-substituted muaj peev xwm nqus dej ntau dua li hom methoxy-substituted. Qhov no yog vim tias pawg hydroxypropyl uas muaj nyob hauv HPMC molecule yog hydrophilic thiab ua rau muaj kev sib raug zoo ntawm HPMC rau dej. Qhov sib piv, hom methoxy-substituted tsawg dua hydrophilic thiab yog li ntawd muaj peev xwm khaws dej qis dua. Yog li ntawd, lwm hom HPMC yuav tsum tau xaiv zoo raws li cov khoom xav tau ntawm cov khoom kawg.

tsom ntsoov rau

Qhov concentration ntawm HPMC kuj cuam tshuam rau nws lub peev xwm khaws dej. Ntawm qhov concentration qis, HPMC tsis tsim cov qauv zoo li gel, yog li nws lub peev xwm khaws dej qis. Raws li qhov concentration ntawm HPMC nce, cov polymer molecules pib sib koom ua ke, tsim cov qauv zoo li gel. Lub network gel no nqus thiab khaws dej, thiab lub peev xwm khaws dej ntawm HPMC nce nrog qhov concentration. Txawm li cas los xij, nws yuav tsum tau sau tseg tias qhov concentration siab dhau ntawm HPMC yuav ua rau muaj teeb meem kev tsim cov qauv xws li viscosity thiab kev ua haujlwm nyuaj. Yog li ntawd, qhov concentration ntawm HPMC siv yuav tsum tau ua kom zoo tshaj plaws kom ua tiav qhov peev xwm khaws dej xav tau thaum zam cov teeb meem uas tau hais los saum toj no.

Tus nqi PH

Tus nqi pH ntawm ib puag ncig uas HPMC siv kuj yuav cuam tshuam rau nws lub peev xwm khaws dej. Cov qauv HPMC muaj cov pab pawg anionic (-COO-) thiab cov pab pawg hydrophilic ethylcellulose (-OH). Qhov ionization ntawm -COO- pawg yog nyob ntawm pH, thiab lawv qib ionization nce nrog pH. Yog li ntawd, HPMC muaj peev xwm khaws dej ntau dua ntawm pH siab. Ntawm pH qis, -COO- pawg yog protonated thiab nws cov hydrophilicity txo qis, ua rau muaj peev xwm khaws dej qis dua. Yog li ntawd, pH ib puag ncig yuav tsum tau ua kom zoo dua kom ua tiav lub peev xwm khaws dej xav tau ntawm HPMC.

xaus lus

Xaus lus, lub peev xwm khaws dej ntawm HPMC yog ib qho tseem ceeb uas cuam tshuam rau nws txoj kev ua tau zoo ua ib qho tshuaj ntxiv. Cov yam tseem ceeb uas cuam tshuam rau lub peev xwm khaws dej ntawm HPMC suav nrog qhov hnyav molecular, hom hloov pauv, concentration thiab pH tus nqi. Los ntawm kev kho cov yam no kom zoo, lub peev xwm khaws dej ntawm HPMC tuaj yeem ua kom zoo dua kom ua tiav cov khoom xav tau ntawm cov khoom kawg. Cov kws tshawb fawb tshuaj thiab cov chaw tsim khoom yuav tsum ua tib zoo saib xyuas cov yam no kom ntseeg tau tias cov tshuaj HPMC zoo tshaj plaws thiab ua tau zoo.