I-Cellulose Ether

Iselulosi etheryenziwe ngeselulosi ngokusabela kwe-etherification ye-etherification enye okanye iiarhente ezininzi kunye nokusila okomileyo. Ngokweendlela ezahlukeneyo zeekhemikhali ze-ether substituents, i-cellulose ethers inokwahlulwa ibe yi-anionic, cationic kunye ne-nonionic ethers. Ionic cellulose ethers ikakhulu ibandakanyaI-carboxymethyl cellulose ether (CMC); non-ionic cellulose ethers ikakhulu ziqukaimethyl cellulose ether (MC),ihydroxypropyl methyl cellulose ether (HPMC)kunye ne-hydroxyethyl cellulose ether.I-chlorine ether (HC)kwaye nangokunjalo. Ii-ethers ezingenayo i-ionic zahlulwe zibe zii-ethers ezinyibilikayo emanzini kunye ne-oyile-ethers e-soluble, kunye ne-non-ionic e-soluble ethers zisetyenziswa kakhulu kwiimveliso zodaka. Xa kukho i-calcium ions, i-ionic cellulose ether ayizinzile, ngoko ke ayifane isetyenziswe kwiimveliso zodaka ezixubeneyo ezisebenzisa i-samente, i-lime ye-slaked, njl. njengezinto zokumisa. I-ethers ye-cellulose e-soluble e-nonionic yamanzi isetyenziswa ngokubanzi kwishishini lezinto zokwakha ngenxa yokuzinza kwazo kunye nokugcinwa kwamanzi.

Iipropati zeMichiza ye-Cellulose Ether

I-cellulose ether nganye inesiseko seselulosi—isakhiwo seAnhydroglucose. Kwinkqubo yokuvelisa i-cellulose ether, i-fiber cellulose iqala ukufudumeza kwisisombululo se-alkali, kwaye iphathwa nge-etherifying agent. Imveliso ye-fibrous reaction ihlanjululwa kwaye icolile ukwenza umgubo ofanayo kunye nokucolwa okuthile.

Kwinkqubo yokuvelisa i-MC, kuphela i-methyl chloride isetyenziswa njenge-etherification agent; ukongeza kwi-methyl chloride, ipropylene oxide ikwasetyenziselwa ukufumana amaqela abambeleyo e-hydroxypropyl kwimveliso ye-HPMC. Iintlobo ezahlukeneyo ze-cellulose ethers zinee-methyl kunye ne-hydroxypropyl substitution ratios ezahlukeneyo, ezichaphazela ukuhambelana kwezinto eziphilayo kunye nobushushu be-thermal gelation yezisombululo ze-cellulose ether.