Carboxymethyl cellulose (CMC) ke motsoako oa cellulose o qhibilihang ka metsing o sebelisoang haholo liindastering tse fapaneng, ho kenyeletsoa lijo, meriana le tlhokomelo ea motho. The degree of substitution (DS) ke parameter ea bohlokoa e amang thepa ea CMC. Sehloohong sena, re tla tšohla tšusumetso ea DS ho boleng ba carboxymethyl cellulose.
Ntlha ea pele, ke habohlokoa ho utloisisa hore na tekanyo ea ho fetola ke efe. Tekanyo ea ho nka sebaka e bolela palo ea lihlopha tsa carboxymethyl ka yuniti ea tsoekere ka ketane ea cellulose. CMC e hlahisoa ke ho arabela selulose ka sodium monochloroacetate le sodium hydroxide. Nakong ea karabelo ena, lihlopha tsa hydroxyl ka ketane ea cellulose li nkeloa sebaka ke lihlopha tsa carboxymethyl. Tekanyo ea ho nkela sebaka e ka laoloa ke maemo a fapaneng a karabelo, joalo ka khatello ea sodium hydroxide le sodium monochloroacetate, nako ea karabelo le mocheso.
DS ea CMC e ama litšobotsi tsa eona tsa 'mele le lik'hemik'hale, joalo ka ho qhibiliha ha eona, viscosity, le botsitso ba mocheso. CMC e nang le DS e tlase e na le tekanyo e phahameng ea crystallinity 'me ha e qhibilihe ka metsing ho feta CMC e nang le DS e phahameng. Lebaka ke hobane lihlopha tsa carboxymethyl ho CMC tse nang le DS e tlase li fumaneha holim'a ketane ea cellulose, e fokotsang ho qhibiliha ha eona metsing. Ka lehlakoreng le leng, CMC e nang le DS e phahameng e na le sebopeho sa amorphous mme e qhibiliha ka metsing ho feta CMC e nang le DS e tlase.
Viscosity ea CMC e boetse e angoa ke DS. CMC e nang le DS e tlase e na le viscosity e tlase ho feta CMC e nang le DS e phahameng. Lebaka ke hobane lihlopha tsa carboxymethyl tse CMC tse nang le DS e tlase li arohane ho feta, e leng ho fokotsang tšebelisano lipakeng tsa liketane tsa cellulose le ho theola viscosity. Ka lehlakoreng le leng, CMC e nang le DS e phahameng e na le viscosity e phahameng hobane lihlopha tsa carboxymethyl li atamelane, e leng se eketsang tšebelisano pakeng tsa liketane tsa cellulose le ho phahamisa viscosity.
Ntle le litšobotsi tsa eona tsa 'mele, DS ea CMC e boetse e ama likarolo tsa eona tsa lik'hemik'hale. CMC e nang le DS e tlase ha e tsitse ha mocheso o phahameng le boleng ba pH ho feta CMC e nang le DS e phahameng. Sena se bakoa ke hore lihlopha tsa carboxymethyl tse CMC tse nang le DS e tlase li kotsing ea hydrolysis mme li ka senyeha tlas'a maemo a thata. Ka lehlakoreng le leng, CMC e nang le DS e phahameng e tsitsitse haholoanyane mochesong o phahameng le boleng ba pH hobane lihlopha tsa carboxymethyl li tlameletsoe ka thata ho ketane ea cellulose.
Nako ea poso: Mar-10-2023