Impahla ebaluleke kakhulu yesisombululo se-cellulose ether yimpahla yaso ye-rheological. Izakhiwo ezikhethekile ze-rheological zama-ether amaningi e-cellulose zenza zisetshenziswe kabanzi emikhakheni eyahlukahlukene, futhi ucwaningo lwezakhiwo ze-rheological luwusizo ekuthuthukisweni kwamasimu amasha okusetshenziswa noma ekuthuthukisweni kwamanye amasimu okusetshenziswa. ULi Jing waseShanghai Jiao Tong University wenze ucwaningo oluhlelekile ngezakhiwo ze-rheological zei-carboxymethylcellulose (CMC), kufaka phakathi ithonya lamapharamitha esakhiwo sama-molecule e-CMC (isisindo sama-molecule kanye nezinga lokushintsha), i-pH yokuhlushwa, kanye namandla e-ionic. Imiphumela yocwaningo ikhombisa ukuthi i-viscosity ye-zero-shear yesisombululo iyanda ngokwanda kwesisindo sama-molecule kanye nezinga lokushintsha. Ukwanda kwesisindo sama-molecule kusho ukukhula kweketanga lama-molecule, kanye nokuxinana okulula phakathi kwama-molecule kwandisa i-viscosity yesisombululo; izinga elikhulu lokushintsha kwenza ama-molecule anwebeke kakhulu esixazululweni. Isimo sikhona, ivolumu ye-hydrodynamic inkulu kakhulu, futhi i-viscosity iba nkulu. I-viscosity yesisombululo samanzi se-CMC iyanda ngokwanda kokuhlushwa, okune-viscoelasticity. I-viscosity yesisombululo iyancipha ngenani le-pH, futhi uma iphansi kunenani elithile, i-viscosity iyanda kancane, futhi ekugcineni i-asidi yamahhala iyakhiwa futhi iqhume. I-CMC iyi-polymer ye-polyanionic, lapho ingeza ama-ion kasawoti e-monovalent i-Na+, isivikelo se-K+, i-viscosity izokwehla ngokufanele. Ukwengezwa kwe-divalent cation Caz+ kubangela ukuthi i-viscosity yesisombululo yehle kuqala bese ikhuphuka. Uma ukuhlushwa kwe-Ca2+ kuphakeme kunephuzu le-stoichiometric, ama-molecule e-CMC asebenzisana ne-Ca2+, futhi kukhona isakhiwo esingaphezulu esixazululweni. ULiang Yaqin, waseNorth University of China, njll. usebenzise indlela ye-viscometer kanye nendlela ye-rotary viscometer ukwenza ucwaningo olukhethekile ngezakhiwo ze-rheological zezixazululo ezincibilikisiwe nezihlanganisiwe ze-hydroxyethyl cellulose eguquliwe (CHEC). Imiphumela yocwaningo ithole ukuthi: (1) I-Cationic hydroxyethyl cellulose inokuziphatha okujwayelekile kwe-polyelectrolyte viscosity emanzini ahlanzekile, futhi i-viscosity encishisiwe iyanda ngokukhula kokuhlushwa. I-viscosity yangaphakathi ye-cationic hydroxyethyl cellulose enezinga eliphezulu lokushintshaniswa inkulu kuneye-cationic hydroxyethyl cellulose enezinga eliphansi lokushintshaniswa. (2) Isixazululo se-cationic hydroxyethyl cellulose sibonisa izici zoketshezi ezingezona ezaseNewtonian futhi sinezici zokunciphisa uketshezi: njengoba ukuhlushwa kwesisindo sesisombululo kukhuphuka, i-viscosity yayo ebonakalayo iyanda; ekuhlushweni okuthile kwesisombululo sikasawoti, i-CHEC viscosity ebonakalayo Iyancipha ngokukhula kokuhlushwa kukasawoti owengeziwe. Ngaphansi kwesilinganiso esifanayo sokucheba, i-viscosity ebonakalayo ye-CHEC ohlelweni lwesisombululo se-CaCl2 iphakeme kakhulu kuneye-CHEC ohlelweni lwesisombululo se-NaCl.
Ngokuqhubeka kokujula kocwaningo kanye nokwanda okuqhubekayo kwamasimu okusetshenziswa, izakhiwo zezixazululo zesistimu exubile ezakhiwe ngama-ether e-cellulose ahlukene nazo zitholwe ukunakwa ngabantu. Isibonelo, i-sodium carboxymethyl cellulose (NACMC) kanye ne-hydroxyethyl cellulose (HEC) zisetshenziswa njengezinto zokuhambisa uwoyela ezindaweni zikawoyela, ezinezinzuzo zokumelana okuqinile nokusika, izinto zokusetshenziswa eziningi kanye nokungcola okuncane kwemvelo, kodwa umphumela wokuzisebenzisa zodwa awulungile. Nakuba owokuqala une-viscosity enhle, uthintwa kalula yizinga lokushisa kanye nosawoti; yize owokugcina unokumelana okuhle nokushisa kanye nosawoti, ikhono lawo lokujiya alilungile futhi umthamo mkhulu kakhulu. Abacwaningi baxube lezi zixazululo ezimbili bathola ukuthi i-viscosity yesisombululo esihlanganisiwe yaba nkulu, ukumelana nokushisa kanye nokumelana nosawoti kwathuthukiswa ngezinga elithile, futhi umphumela wokusetshenziswa wathuthukiswa. UVerica Sovilj nabanye bafunde ukuziphatha kwe-rheological kwesisombululo sesistimu exubile esakhiwe yi-HPMC kanye ne-NACMC kanye ne-anionic surfactant ene-viscometer ejikelezayo. Ukuziphatha kwe-rheological kwesistimu kuncike emiphumeleni eyahlukene ye-HPMC-NACMC, HPMC-SDS kanye ne-NACMC- (HPMC-SDS) eyenzeka phakathi.
Izakhiwo ze-rheological zezixazululo ze-cellulose ether nazo zithinteka yizici ezahlukahlukene, njengezithasiselo, amandla angaphandle okusebenza kanye nokushisa. UTomoaki Hino nabanye bafunde umphumela wokufakwa kwe-nicotine ezimpahleni ze-rheological ze-hydroxypropyl methylcellulose. Ku-25C kanye nokuhlushwa okungaphansi kuka-3%, i-HPMC ibonise ukuziphatha koketshezi lwe-Newtonian. Lapho i-nicotine ingezwa, i-viscosity yanda, okubonisa ukuthi i-nicotine yandisa ukubanjwa kwe-I-HPMCama-molecule. I-Nicotine lapha ibonisa umphumela wosawoti ophakamisa iphuzu lejeli kanye nephuzu lenkungu le-HPMC. Amandla omshini afana namandla okugunda nawo azoba nethonya elithile ezimpahleni zesisombululo samanzi se-cellulose ether. Ukusebenzisa i-turbidimeter ye-rheological kanye nethuluzi lokuhlakaza ukukhanya kwe-angle encane, kutholakala ukuthi esixazululweni esincibilikisiwe kancane, okwandisa izinga lokugunda, ngenxa yokuxubana kokugunda, izinga lokushisa lokuguquka kwephuzu lenkungu lizokhula.
Isikhathi sokuthunyelwe: Ephreli-28-2024