Kev coj cwj pwm theem thiab kev tsim cov fibril hauv cov cellulose ethers aqueous

Kev ua haujlwm ntawm cov kua dej thiab kev tsim cov fibrillation hauv cov ntshavcov cellulose ethersyog cov xwm txheej nyuaj uas cuam tshuam los ntawm cov qauv tshuaj ntawm cov cellulose ethers, lawv qhov kev sib xyaw, qhov kub, thiab qhov muaj lwm yam khoom ntxiv. Cellulose ethers, xws li Hydroxypropyl Methylcellulose (HPMC) thiab Carboxymethyl Cellulose (CMC), paub txog lawv lub peev xwm los tsim cov gels thiab qhia txog kev hloov pauv theem nthuav. Nov yog kev piav qhia dav dav:

Kev coj cwj pwm theem:

1. Kev Hloov Pauv Sol-Gel:
   • Cov kua dej ntawm cellulose ethers feem ntau dhau los ua sol-gel hloov pauv thaum qhov concentration nce ntxiv.
   • Thaum cov concentration qis dua, cov tshuaj ua haujlwm zoo li kua (sol), thaum thaum cov concentration siab dua, nws tsim cov qauv zoo li gel.
2. Kev Ntsuas Gelation Tseem Ceeb (CGC):
   • CGC yog qhov concentration uas qhov kev hloov pauv ntawm kev daws teeb meem mus rau gel tshwm sim.
   • Cov yam tseem ceeb uas cuam tshuam rau CGC suav nrog qib kev hloov pauv ntawm cellulose ether, kub, thiab muaj ntsev lossis lwm yam khoom ntxiv.
3. Kev Nyob Ntawm Qhov Kub:
   • Gelation feem ntau yog nyob ntawm qhov kub thiab txias, nrog rau qee cov cellulose ethers qhia txog kev nce gelation ntawm qhov kub siab dua.
   • Qhov kev kub ntxhov no yog siv rau hauv cov ntawv thov xws li kev tso tshuaj thiab kev ua zaub mov.

Kev tsim cov fibrillar:

1. Kev sib sau ua ke ntawm micellar:
   • Ntawm qee qhov kev sib xyaw, cellulose ethers tuaj yeem tsim cov micelles lossis aggregates hauv cov kua.
   • Qhov kev sib sau ua ke yog tsav los ntawm kev sib cuam tshuam hydrophobic ntawm cov pab pawg alkyl lossis hydroxyalkyl uas tau qhia thaum lub sijhawm etherification.
2. Kev tsim cov fibrillation:
   • Kev hloov pauv ntawm cov saw polymer soluble mus rau insoluble fibrils cuam tshuam nrog cov txheej txheem hu ua fibrillogenesis.
   • Cov fibrils yog tsim los ntawm kev sib cuam tshuam ntawm cov molecule, hydrogen bonding, thiab kev sib txuas ntawm cov polymer chains.
3. Kev cuam tshuam ntawm Shear:
   • Kev siv cov zog shear, xws li kev nplawm lossis kev sib tov, tuaj yeem txhawb kev tsim fibril hauv cov tshuaj cellulose ether.
   • Cov qauv tsim los ntawm kev txiav yog qhov tseem ceeb hauv cov txheej txheem kev lag luam thiab kev siv.
4. Cov Khoom Ntxiv thiab Kev Sib Txuas:
   • Qhov ntxiv ntawm cov ntsev lossis lwm yam khoom siv ntxiv tuaj yeem cuam tshuam rau kev tsim cov qauv fibrillar.
   • Cov neeg sawv cev crosslinking yuav siv tau los tswj thiab ua kom cov fibrils muaj zog.

Cov ntawv thov:

1. Kev Xa Tshuaj:
   • Cov khoom siv gelation thiab fibril tsim ntawm cellulose ethers yog siv rau hauv cov tshuaj tswj kev tso tawm.
2. Kev Lag Luam Khoom Noj:
   • Cellulose ethers pab txhawb rau qhov kev ntxhib los mos thiab kev ruaj khov ntawm cov khoom noj los ntawm kev gelation thiab thickening.
3. Cov Khoom Siv Saib Xyuas Tus Kheej:
   • Kev tsim cov gelation thiab fibril txhim kho kev ua tau zoo ntawm cov khoom xws li tshuaj zawv plaub hau, tshuaj pleev, thiab tshuaj pleev.
4. Cov Khoom Siv Tsim Kho:
   • Cov khoom gelation yog qhov tseem ceeb hauv kev tsim cov ntaub ntawv siv hauv kev tsim kho xws li cov nplaum pobzeb thiab cov mortars.

Kev nkag siab txog tus cwj pwm theem thiab fibril tsim ntawm cellulose ethers yog qhov tseem ceeb rau kev kho lawv cov khoom rau cov ntawv thov tshwj xeeb. Cov kws tshawb fawb thiab cov neeg tsim qauv ua haujlwm los ua kom zoo dua cov khoom no rau kev ua haujlwm zoo dua hauv ntau yam lag luam.