I-Carboxymethyl cellulose (CMC) iphuma ku-cellulose encibilika emanzini esetshenziswa kabanzi ezimbonini ezahlukahlukene, okubandakanya ukudla, imithi, nokunakekelwa komuntu siqu. I-degree of substitution (DS) iyipharamitha ebalulekile ethinta izakhiwo ze-CMC. Kulesi sihloko, sizoxoxa ngethonya le-DS kukhwalithi ye-carboxymethyl cellulose.
Okokuqala, kubalulekile ukuqonda ukuthi liyini izinga lokushintshwa. Izinga lokushintsha libhekisela enanini lamaqembu e-carboxymethyl ngeyunithi ngayinye ye-glucose ochungechungeni lwe-cellulose. I-CMC ikhiqizwa ngokusabela kwe-cellulose nge-sodium monochloroacetate ne-sodium hydroxide. Phakathi nalokhu kusabela, amaqembu e-hydroxyl ochungechungeni lwe-cellulose athathelwa indawo amaqembu e-carboxymethyl. Izinga lokushintsha lingalawulwa ngokushintsha izimo zokusabela, njengokuhlushwa kwe-sodium hydroxide ne-sodium monochloroacetate, isikhathi sokusabela, kanye nezinga lokushisa.
I-DS ye-CMC ithinta izici zayo ezingokomzimba namakhemikhali, njengokuncibilika kwayo, i-viscosity, kanye nokuzinza kokushisa. I-CMC ene-DS ephansi inezinga eliphakeme lokucwebezela futhi ayincibiliki emanzini kune-CMC ene-DS ephezulu. Lokhu kungenxa yokuthi amaqembu e-carboxymethyl ku-CMC ane-DS ephansi atholakala phezu kochungechunge lwe-cellulose, okunciphisa ukuncibilika kwayo emanzini. Ngokuphambene, i-CMC ene-DS ephezulu inokwakheka kwe-amorphous futhi incibilika kakhulu emanzini kune-CMC ene-DS ephansi.
I-viscosity ye-CMC nayo iyathinteka yi-DS. I-CMC ene-DS ephansi ine-viscosity ephansi kune-CMC ene-DS ephezulu. Lokhu kungenxa yokuthi amaqembu e-carboxymethyl ku-CMC ane-DS ephansi ahlukaniswa ngokuqhubekayo, okunciphisa ukusebenzisana phakathi kwamaketanga e-cellulose futhi kwehlisa i-viscosity. Ngokuphambene, i-CMC ene-DS ephezulu ine-viscosity ephakeme ngenxa yokuthi amaqembu e-carboxymethyl asondelene ndawonye, okwandisa ukusebenzisana phakathi kwamaketanga e-cellulose futhi akhulise i-viscosity.
Ngaphezu kwezakhiwo zayo ezibonakalayo, i-DS ye-CMC iphinde ithinte izakhiwo zayo zamakhemikhali. I-CMC ene-DS ephansi ayizinzile kangako emazingeni okushisa aphezulu kanye namanani e-pH kune-CMC ene-DS ephezulu. Lokhu kungenxa yokuthi amaqembu e-carboxymethyl ku-CMC ane-DS ephansi asengozini yokuthola i-hydrolysis futhi angaphuka ngaphansi kwezimo ezinzima. Ngokuphambene, i-CMC ene-DS ephezulu izinzile emazingeni okushisa aphezulu kanye namanani e-pH ngoba amaqembu e-carboxymethyl aboshwe kakhulu ochungechungeni lwe-cellulose.
Isikhathi sokuthumela: Mar-10-2023