Carboxymethyl cellulose (CMC) waa derivative cellulose biyo-milmi ah oo si weyn loogu isticmaalo warshado kala duwan, oo ay ku jiraan cuntada, daawooyinka, iyo daryeelka shakhsi ahaaneed. Heerka beddelka (DS) waa halbeeg muhiim ah oo saameeya sifooyinka CMC. Maqaalkan, waxaan kaga hadli doonaa saameynta DS ee tayada karboxymethyl cellulose.
Marka hore, waa muhiim in la fahmo heerka beddelka waa maxay. Heerka beddelka waxa loola jeedaa tirada kooxda karboxymethyl ee unugga gulukoosta ee silsiladda cellulose. CMC waxa lagu soo saaraa iyada oo ka falcelinaysa cellulose leh sodium monochloroacetate iyo sodium hydroxide. Inta lagu jiro falcelintan, kooxaha hydroxyl ee silsiladda cellulose waxaa lagu beddelaa kooxaha karboxymethyl. Heerka beddelka waxaa lagu xakameyn karaa kala duwanaanshaha xaaladaha falcelinta, sida fiirsashada sodium hydroxide iyo sodium monochloroacetate, waqtiga falcelinta, iyo heerkulka.
DS ee CMC waxay saamaysaa astaamaheeda jidheed iyo kiimikaad, sida milmigeeda, viscosity-keeda, iyo xasiloonida kulaylka. CMC oo leh DS hoose ayaa leh heerar sare oo crystallinity waana biyo-milmi yar marka loo eego CMC oo leh DS sare. Tani waa sababta oo ah kooxaha karboxymethyl ee CMC ee leh DS hooseeya waxay ku yaalaan dusha sare ee silsiladda cellulose, taas oo yareyneysa biyaha-millanaanta. Taas bedelkeeda, CMC oo leh DS sare ayaa leh qaab-dhismeed aad u qurux badan waana biyo-milmi badan marka loo eego CMC oo leh DS hooseeya.
Viscosity ee CMC sidoo kale waxaa saameeya DS. CMC oo leh DS hoose ayaa leh aragti hoose marka loo eego CMC oo leh DS sare. Tani waa sababta oo ah kooxaha karboxymethyl ee CMC ee leh DS hoose ayaa sii fogaanaya, taas oo yaraynaysa isdhexgalka ka dhexeeya silsiladaha cellulose waxayna hoos u dhigtaa viscosity. Taas bedelkeeda, CMC oo leh DS sare waxay leedahay viscosity sare sababtoo ah kooxaha karboksimeylku way isku dhow yihiin, taas oo kordhisa isdhexgalka ka dhexeeya silsiladaha cellulose waxayna kor u qaadaa viscosity.
Marka lagu daro hantideeda jireed, DS ee CMC waxa ay sidoo kale saamaysaa sifooyinkeeda kiimikaad. CMC oo leh DS hoose aad ayuu uga deggan yahay heerkulka sare iyo qiimaha pH marka loo eego CMC oo leh DS sare. Tani waa sababta oo ah kooxaha karboxymethyl ee CMC ee leh DS hooseeya waxay aad ugu nugul yihiin dareeraha waxayna ku burburi karaan xaalado adag. Taas bedelkeeda, CMC oo leh DS sare ayaa aad u deggan heerkulka sare iyo qiimaha pH sababtoo ah kooxaha karboxymethyl waxay si adag ugu xiran yihiin silsiladda cellulose.
Waqtiga boostada: Mar-10-2023