Cellulose ether waa polymer synthetic ah oo laga sameeyay cellulose dabiici ah iyada oo loo marayo wax ka beddelka kiimikada. Cellulose ether waa wax ka soo jeeda cellulose dabiici ah. Soo saarista cellulose ether way ka duwan tahay polymers synthetic. Waxyaabaha ugu aasaasiga ah waa cellulose, oo ah isku-darka polymer dabiiciga ah. Sababtoo ah gaar ahaan qaab-dhismeedka cellulose dabiiciga ah, cellulose lafteedu ma lahan awood ay kula falgasho wakiilada etherification. Si kastaba ha ahaatee, ka dib daaweynta wakiilka bararka, isku-xidhka haydarojiinta ee xooggan ee u dhexeeya silsiladaha molecular iyo silsiladaha waa la burburiyaa, sii deynta firfircoon ee kooxda hydroxyl-na waxay noqotaa cellulose alkali ah oo falgal ah. Hel cellulose ether.
Sifooyinka ether-ka cellulose waxay ku xiran yihiin nooca, tirada iyo qaybinta walxaha beddela. Kala soocidda ether-ka cellulose waxay sidoo kale ku salaysan tahay nooca walxaha beddela, heerka etherification-ka, milmida iyo sifooyinka codsiga ee la xiriira. Sida waafaqsan nooca walxaha beddela ee silsiladda molecular-ka, waxaa loo qaybin karaa monoether iyo ether isku dhafan. Badanaa waxaan u isticmaalnaa mc monoether ahaan, iyo HPmc sida ether isku dhafan. Methyl cellulose ether mc waa badeecada ka dib marka kooxda hydroxyl ee cutubka gulukooska ee cellulose dabiiciga ah lagu beddelo kooxda methoxy. Waa badeecad laga helo iyadoo lagu beddelo qayb ka mid ah kooxda hydroxyl ee cutubka koox methoxy ah iyo qayb kale oo leh koox hydroxypropyl ah. Qaaciddada qaab-dhismeedka waa [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3]n]x Hydroxyethyl methyl cellulose ether HEmc, kuwani waa noocyada ugu waaweyn ee si weyn loo isticmaalo oo lagu iibiyo suuqa.
Marka laga hadlayo milmida, waxaa loo qaybin karaa ionic iyo non-ionic. Ethers-ka cellulose-ka ee aan ionic-ka ahayn ee biyaha ku milma waxay inta badan ka kooban yihiin laba taxane oo ethers alkyl ah iyo ethers hydroxyalkyl ah. Ionic Cmc waxaa inta badan loo isticmaalaa saabuunta macmalka ah, daabacaadda dharka iyo rinjiyeynta, sahaminta cuntada iyo saliidda. Mc-ga aan ionic-ka ahayn, HPmc, HEmc, iwm. waxaa inta badan loo isticmaalaa agabka dhismaha, dahaarka latex-ka, daawada, kiimikooyinka maalinlaha ah, iwm. Waxaa loo isticmaalaa sidii dhumuc-dherer, wakiil haynta biyaha, xasiliye, kala firdhiye iyo wakiil sameeya filimada.
Waqtiga boostada: Noofambar-24-2022