Ho qhaqha cellulose ethers e ka ba mokhoa o rarahaneng ka lebaka la sebopeho sa bona se ikhethang sa lik'hemik'hale le thepa. Li-cellulose ethers ke li-polymers tse qhibilihang ka metsing tse nkiloeng ho cellulose, polysaccharide ea tlhaho e fumanehang maboteng a lisele tsa semela. Li sebelisoa haholo liindastering tse fapaneng tse kang tsa meriana, lijo, masela le kaho ka lebaka la thepa ea tsona e ntle haholo ea ho etsa lifilimi, ho tenya, ho tlama le ho tsitsisa.
1. Ho utloisisa Cellulose Ethers:
Li-cellulose ethers li tsoa ho selulose, moo lihlopha tsa hydroxyl li nkeloang sebaka ke lihlopha tsa ether ka mokhoa o itseng kapa ka botlalo. Mefuta e tsebahalang haholo e kenyelletsa methyl cellulose (MC), hydroxypropyl cellulose (HPC), hydroxyethyl cellulose (HEC), le carboxymethyl cellulose (CMC). Mofuta o mong le o mong o na le thepa e ikhethang ho latela tekanyo le mofuta oa ho nkela sebaka.
2. Lintlha tse Amang Solubility:
Lintlha tse 'maloa li susumetsa ho qhibiliha ha cellulose ethers:
Degree of Substitution (DS): DS e Phahameng ka kakaretso e ntlafatsa ho qhibiliha kaha e eketsa hydrophilicity ea polymer.
Boima ba Molek'hule: Li-ethers tse phahameng tsa boima ba molek'hule li ka 'na tsa hloka nako e eketsehileng kapa matla bakeng sa ho qhibiliha.
Thepa ea Tharollo: Litlhapi tse nang le polarity e phahameng le matla a ho kopanya haedrojene, joalo ka metsi le lihlapi tsa polar organic, hangata li sebetsa hantle bakeng sa ho qhala li-cellulose ethers.
Mocheso: Ho eketseha ha mocheso ho ka ntlafatsa ho qhibiliha ka ho eketsa matla a kinetic a limolek'hule.
Ho ferekana: Ho ferekana ha mechine ho ka thusa ho qhibiliha ka ho eketsa kamano pakeng tsa solvent le polymer.
pH: Bakeng sa li-ether tse ling tsa cellulose joalo ka CMC, pH e ka ama haholo ho qhibiliha ka lebaka la lihlopha tsa eona tsa carboxymethyl.
3. Litlhapi bakeng sa ho Qhala:
Metsi: Li-ether tse ngata tsa cellulose li qhibiliha habonolo ka metsing, e leng se etsang hore e be eona e qhibilihisang haholo lits'ebetsong tse ngata.
Joala: Ethanol, methanol, le isopropanol li atisa ho sebelisoa li-co-solvents ho ntlafatsa ho qhibiliha ha cellulose ethers, haholo-holo ho ba nang le metsi a fokolang.
Organic Solvents: Dimethyl sulfoxide (DMSO), dimethylformamide (DMF), le N-methylpyrrolidone (NMP) hangata li sebelisoa bakeng sa lisebelisoa tse khethehileng moo ho hlokahalang ho qhibiliha ho hoholo.
4. Mekhoa ea ho Fella:
Ho Susumetsa ha bonolo: Bakeng sa lits'ebetso tse ngata, ho hlohlelletsa li-ether tsa cellulose ka har'a motsoako o loketseng mochesong oa mocheso ho lekane ho qhibiliha. Leha ho le joalo, lithempereichara tse phahameng le nako e telele ea ho sisinyeha li ka 'na tsa hlokahala bakeng sa ho qhibiliha ka ho feletseng.
Ho futhumatsa: Ho futhumatsa motsoako kapa motsoako oa solvent-polymer ho ka potlakisa ho qhibiliha, haholo-holo bakeng sa limolek'hule tse phahameng tsa cellulose ethers kapa tse nang le ho qhibiliha ha tlaase.
Ultrasonication: Ultrasonic agitation e ka ntlafatsa ho qhibiliha ka ho theha li-bubble tsa cavitation tse khothalletsang ho arohana ha li-polymer aggregates le ho ntlafatsa ho kenella ha solvent.
Tšebeliso ea li-Co-solvents: Ho kopanya metsi le joala kapa li-solvents tse ling tsa polar ho ka ntlafatsa ho qhibiliha, haholo-holo bakeng sa li-cellulose ethers tse nang le metsi a fokolang.
5. Maikutlo a Sebetsang:
Boholo ba Particle: Li-ethers tsa cellulose tse nang le phofshoana e khabane li qhibiliha habonolo ho feta likaroloana tse kholo ka lebaka la ho eketseha ha sebaka.
Tokisetso ea Litharollo: Ho lokisa litharollo tsa ether ea cellulose ka mokhoa oa mohato, joalo ka ho qhalakanya polymer karolong e 'ngoe ea mokelikeli pele o eketsa tse ling, ho ka thusa ho thibela ho putlama le ho etsa bonnete ba ho qhibiliha ho tšoanang.
Phetoho ea pH: Bakeng sa li-cellulose ethers tse utloang pH, ho fetola pH ea solvent ho ka ntlafatsa ho qhibiliha le botsitso.
Tšireletseho: Litlhapi tse ling tse sebelisetsoang ho qhibilihisa cellulose ethers li ka baka likotsi tsa bophelo bo botle le polokeho. Ho lokela hore ho sebelisoe moea o nepahetseng le thepa e sireletsang motho ha ho sebetsoa lihlapolli tsena.
6. Maikutlo a ikhethileng mabapi le ts'ebeliso:
Meriana: Li-cellulose ethers li sebelisoa haholo mekhoeng ea meriana bakeng sa tokollo e laoloang, e tlamang, le ho tiea. Khetho ea mokhoa oa ho qhibiliha le oa ho qhibiliha o itšetlehile ka litlhoko tse khethehileng tsa ho theha.
Lijo: Ha ho sebelisoa lijo, li-cellulose ethers li sebelisoa e le li-thickeners, stabilizers, le tse nkang mafura sebaka. Litlhapi tse tsamaellanang le melao ea lijo li tlameha ho sebelisoa, 'me maemo a ho qhibiliha a lokela ho ntlafatsoa ho boloka boleng ba sehlahisoa.
Kaho: Li-cellulose ethers li sebelisoa linthong tsa kaho tse kang seretse, li-grouts le likhomaretsi. Khetho ea li-solvent le maemo a ho qhibiliha a bohlokoa ho fihlella viscosity e lakatsehang le thepa ea ts'ebetso.
7. Litsela tsa kamoso:
Patlisiso mabapi le li-solvents tse ncha le mekhoa ea ho qhibiliha e ntse e tsoela pele ho ntšetsa pele lefapha la k'hemistri ea cellulose ether. Li-solvents tse tala, joalo ka CO2 e phahameng haholo le lino tse nang le ionic, li fana ka mefuta e meng e ka bang teng ka phello e fokotsehileng ea tikoloho. Ntle le moo, tsoelo-pele ea boenjiniere ba polymer le nanotechnology e ka lebisa ho nts'etsopele ea li-cellulose ethers tse nang le likarolo tse ntlafalitsoeng tsa ho qhibiliha le ts'ebetso.
ho qhibiliha ha cellulose ethers ke ts'ebetso e mengata e susumetsoang ke lintlha tse sa tšoaneng tse kang sebopeho sa polymer, thepa ea solvent, le mekhoa ea ho qhibiliha. Ho utloisisa lintlha tsena le ho khetha li-solvents le mekhoa e nepahetseng ho bohlokoa bakeng sa ho fihlela tšubuhlellano e ntle le ho ntlafatsa ts'ebetso ea li-cellulose ethers lits'ebetsong tse fapaneng.
Nako ea poso: Apr-10-2024