I-Cellulose Ether

I-cellulose etheryenziwa nge-cellulose ngokusabela kwe-etherification kwe-ejenti ye-etherification eyodwa noma amaningana kanye nokugaya okomile. Ngokwezakhiwo zamakhemikhali ezihlukene zama-ether substituents, ama-cellulose ether angahlukaniswa abe ama-anionic, cationic kanye nama-nonionic ether. Ionic cellulose ethers ikakhulukazi ihlanganisai-carboxymethyl cellulose ether (CMC); ama-non-ionic cellulose ether ikakhulukazi ahlanganisai-methyl cellulose ether (MC),i-hydroxypropyl methyl cellulose ether (HPMC)kanye ne-hydroxyethyl cellulose ether.I-Chlorine ether (HC)njalo njalo. Ama-ether angewona ama-ionic ahlukaniswe abe ama-ether ancibilika emanzini kanye nama-ether ancibilika uwoyela, kanti ama-ether angancibiliki amanzi angewona ama-ionic asetshenziswa kakhulu emikhiqizweni yodaka. Ebukhoneni be-calcium ions, i-ionic cellulose ether ayizinzile, ngakho-ke ayivamisile ukusetshenziswa emikhiqizweni yodaka oluxutshwe okomile esebenzisa usimende, umcako we-slaked, njll. njengezinto zokuhlanganisa. I-Nonionic water-soluble cellulose ethers isetshenziswa kakhulu embonini yezinto zokwakha ngenxa yokuqina kwayo kokumiswa kanye nokugcinwa kwamanzi.

Izakhiwo Zamakhemikhali ze-Cellulose Ether

I-cellulose ether ngayinye inesakhiwo esiyisisekelo se-cellulose—isakhiwo se-Anhydroglucose. Enqubweni yokukhiqiza i-cellulose ether, i-cellulose fiber iqala ukushiswa ngesisombululo se-alkaline, bese iphathwa nge-ejenti etherifying. Umkhiqizo we-fibrous reaction uyahlanzwa futhi ucolwe ukwenza impushana efanayo enobunono obuthile.

Enqubweni yokukhiqiza ye-MC, i-methyl chloride kuphela esetshenziswa njenge-ejenti ye-etherification; ngaphezu kwe-methyl chloride, i-propylene oxide iphinde isetshenziselwe ukuthola amaqembu angena esikhundleni se-hydroxypropyl ekukhiqizeni i-HPMC. Ama-cellulose ether ahlukahlukene anezilinganiso ezihlukile ze-methyl ne-hydroxypropyl esikhundleni, ezithinta ukuhambisana kwezinto eziphilayo kanye nezinga lokushisa elishisayo le-gelation yezixazululo ze-cellulose ether.