Cellulose ethers ke sehlopha se khahlang sa metsoako e nkiloeng ho selulose, e leng e 'ngoe ea li-polymer tsa tlhaho tse ngata ka ho fetisisa Lefatšeng. Lisebelisoa tsena tse feto-fetohang li fumana lits'ebetso ho pholletsa le liindasteri tse fapaneng, ho kenyeletsoa meriana, lijo, litlolo, kaho le masela, ka lebaka la thepa le ts'ebetso ea tsona e ikhethang.
1. Sebopeho le Thepa ea Cellulose:
Cellulose ke polysaccharide e nang le liketane tse telele tsa likarolo tsa tsoekere tse hokahaneng ka libonto tsa β(1→4) tsa glycosidic. Li-unit tsa glucose tse pheta-phetoang li fana ka cellulose ka sebopeho se otlolohileng le se thata. Tlhophiso ena ea sebopeho e fella ka tlamahano e matla ea haedrojene lipakeng tsa liketane tse haufi, e tlatsetsang mekhoeng e metle ea selulose.
Lihlopha tsa hydroxyl (-OH) tse teng ka har'a ketane ea cellulose li etsa hore e be hydrophilic haholo, e lumellang ho monya le ho boloka metsi a mangata. Leha ho le joalo, cellulose e bonts'a ho qhibiliha ho fokolang ho lihlapolli tse ngata tsa organic ka lebaka la marang-rang a eona a matla a li-intermolecular hydrogen bonding.
2. Kenyelletso ea Cellulose Ethers:
Li-cellulose ethers li tsoa ho selulose moo lihlopha tse ling tsa hydroxyl li nkeloang sebaka ke lihlopha tsa ether (-OR), moo R e emelang mefuta e fapaneng ea lintho tse phelang. Liphetoho tsena li fetola thepa ea selulose, e etsa hore e qhibilihe haholoanyane metsing le lihlapolli tsa lintho tse phelang, ha e ntse e boloka tse ling tsa litšobotsi tsa eona tsa tlhaho, tse kang biodegradability le ho se chefo.
3. Tšimoloho ea Cellulose Ethers:
Kakaretso ea li-cellulose ethers hangata e kenyelletsa etherification ea lihlopha tsa cellulose hydroxyl tse nang le li-reagents tse fapaneng tlasa maemo a laoloang. Li-reagents tse tloaelehileng tse sebelisetsoang etherification li kenyelletsa alkyl halides, alkylene oxides, le alkyl halides. Maemo a karabelo a kang mocheso, solvent, le catalysts a phetha karolo ea bohlokoa ho lekanyeng tekanyo ea ho nkela sebaka (DS) le litšobotsi tsa sephetho sa cellulose ether.
4. Mefuta ea Cellulose Ethers:
Li-cellulose ethers li ka hlophisoa ho latela mofuta oa li-substitute tse hokahantsoeng le lihlopha tsa hydroxyl. Tse ling tsa li-cellulose ethers tse sebelisoang haholo li kenyelletsa:
Methyl cellulose (MC)
Hydroxypropyl cellulose (HPC)
Hydroxyethyl cellulose (HEC)
Ethyl hydroxyethyl cellulose (EHEC)
Carboxymethyl cellulose (CMC)
Mofuta o mong le o mong oa cellulose ether o bonts'a thepa e ikhethang mme e loketse lits'ebetso tse ikhethileng ho latela sebopeho sa eona sa lik'hemik'hale le tekanyo ea ho nkela sebaka.
5. Thepa le Lisebelisoa tsa Cellulose Ethers:
Cellulose ethers e fana ka mefuta e mengata ea melemo e etsang hore e be ea bohlokoa haholo liindastering tse fapaneng:
Ho tiisa le ho tsitsisa: Li-cellulose ethers li sebelisoa haholo e le li-thickeners le li-stabilizers lijong, meriana le lihlahisoa tsa tlhokomelo ea motho. Ba ntlafatsa viscosity le thepa ea rheological ea tharollo le emulsions, ho matlafatsa botsitso ba sehlahisoa le sebopeho.
Tlhahiso ea Lifilimi: Li-cellulose ethers li ka etsa lifilimi tse feto-fetohang le tse bonaletsang ha li qhalakanngoa ka metsing kapa lihlapolli tsa tlhaho. Lifilimi tsena li fumana lits'ebetso ho likoahelo, liphutheloana le lits'ebetsong tsa phano ea lithethefatsi.
Ho Boloka Metsi: Sebopeho sa hydrophilic sa cellulose ether se li nolofalletsa ho monya le ho boloka metsi, e leng se etsang hore e be metsoako ea bohlokoa ea thepa ea kaho e kang samente, seretse le lihlahisoa tsa gypsum. Ba ntlafatsa ho sebetsa, ho khomarela, le ho tšoarella ha thepa ena.
Phano ea Lithethefatsi: Li-cellulose ethers li sebelisoa mekhoeng ea meriana e le lisebelisoa ho laola ho lokolloa ha lithethefatsi, ho ntlafatsa bioavailability, le ho pata litatso tse sa thabiseng kapa menko. Hangata li sebelisoa ka matlapa, li-capsules, litlolo le li-suspension.
Phetoho ea Bokaholimo: Li-cellulose ethers li ka fetoloa ka lik'hemik'hale ho hlahisa lihlopha tse sebetsang tse fanang ka thepa e ikhethang joalo ka tšebetso ea antimicrobial, retardancy flame, kapa biocompatibility. Li-ether tsena tse fetotsoeng tsa cellulose li fumana ts'ebeliso ho likoahelo tse khethehileng, masela le lisebelisoa tsa biomedical.
6. Tšusumetso ea Tikoloho le Moshoelella:
Li-cellulose ethers li tsoa mehloling e ka nchafatsoang joalo ka makhasi a lehong, k'hothone, kapa likhoele tse ling tsa semela, e leng ho li etsang hore li tšoarelle ka tlhaho. Ho feta moo, ha li na chefo ebile ha li chefo, li beha kotsi e fokolang ea tikoloho ha li bapisoa le li-polymers tsa maiketsetso. Leha ho le joalo, motsoako oa li-cellulose ethers o ka kenyelletsa liphetoho tsa lik'hemik'hale tse hlokang tsamaiso e hlokolosi ho fokotsa litšila le tšebeliso ea matla.
7. Maikutlo a Bokamoso:
Tlhokahalo ea li-cellulose ethers e lebelletsoe ho tsoela pele ho hola ka lebaka la thepa ea tsona e fapaneng le tlhaho e baballang tikoloho. Boiteko bo tsoelang pele ba lipatlisiso bo tsepamisitse maikutlo ho nts'etsopele ea li-ethers tsa "cellulose" tse ncha tse nang le ts'ebetso e ntlafalitsoeng, ts'ebetso e ntlafalitsoeng ea ts'ebetso, le thepa e etselitsoeng lits'ebetso tse ikhethileng. Ntle le moo, ho kopanngoa ha li-cellulose ethers ho mahlale a ntseng a hlaha joalo ka khatiso ea 3D, nanocomposites le lisebelisoa tsa biomedical ho na le ts'episo ea ho holisa ts'ebeliso ea bona le phihlello ea 'maraka.
cellulose ethers e emela sehlopha sa bohlokoa sa metsoako e nang le lits'ebetso tse fapaneng tse amang liindasteri tse ngata. Motsoako oa bona o ikhethang oa thepa, biodegradability, le botsitso li li etsa hore e be metsoako ea bohlokoa haholo lihlahisoa le lits'ebetso tse fapaneng. Boqapi bo tsoelang pele ho k'hemistri ea cellulose ether le thekenoloji e mothating oa ho tsamaisa tsoelopele le ho bula menyetla e mecha lilemong tse tlang.
Nako ea poso: Apr-18-2024