Ipropati ebaluleke kakhulu yesisombululo se-cellulose ether yipropati yayo ye-rheological. Iipropati ezikhethekileyo ze-rheological ezininzi ze-cellulose ethers zibenza zisetyenziswe ngokubanzi kwiinkalo ezahlukeneyo, kwaye ukufundwa kweepropati ze-rheological kunenzuzo kuphuhliso lwemimandla yesicelo esitsha okanye ukuphuculwa kwezinye iindawo zesicelo. U-Li Jing ovela kwiYunivesithi yaseShanghai Jiao Tong wenza uphando olucwangcisiweyo kwiipropati ze-rheologicali-carboxymethylcellulose (CMC), kubandakanywa nefuthe le-parameters ye-molecular structure ye-CMC (ubunzima bemolekyuli kunye neqondo lokutshintshwa), i-pH yoxinaniso, kunye namandla e-ionic. Iziphumo zophando zibonisa ukuba i-viscosity ye-zero-shear yesisombululo iyanda ngokunyuka kobunzima be-molecular kunye neqondo lokutshintshwa. Ukunyuka kobunzima be-molecular kuthetha ukukhula kwekhonkco le-molecular, kwaye ukuphonswa lula phakathi kweemolekyuli kwandisa i-viscosity yesisombululo; iqondo elikhulu lokutshintshwa kwenza iimolekyuli zolule ngakumbi kwisisombululo. Umbuso ukhona, umthamo we-hydrodynamic mkhulu, kwaye i-viscosity iba nkulu. I-viscosity yesisombululo samanzi se-CMC inyuka ngokunyuka koxinzelelo, olune-viscoelasticity. I-viscosity yesisombululo iyancipha ngexabiso le-pH, kwaye xa iphantsi kunexabiso elithile, i-viscosity iyanda kancane, kwaye ekugqibeleni i-asidi yamahhala yenziwe kwaye iyancipha. I-CMC yipolymer ye-polyanionic, xa idibanisa i-ion yetyuwa ye-monovalent Na +, i-K + shield, i-viscosity iya kuncipha ngokufanelekileyo. Ukongezwa kwe-divalent cation Caz + kubangela ukuba i-viscosity yesisombululo iyancipha kuqala kwaye inyuke. Xa i-concentration ye-Ca2 + iphezulu kune-stoichiometric point, i-molecule ze-CMC zisebenzisana ne-Ca2 +, kwaye i-superstructure ikhona kwisisombululo. U-Liang Yaqin, iYunivesithi yaseNyakatho yaseChina, njl.njl. wasebenzisa indlela ye-viscometer kunye nendlela ye-viscometer yokujikeleza ukwenza uphando olukhethekileyo kwiipropati ze-rheological ze-dilute kunye ne-concentrated solutions of modified hydroxyethyl cellulose (CHEC). Iziphumo zophando zifumene ukuba: (1) I-Cationic hydroxyethyl cellulose inokuziphatha okuqhelekileyo kwe-polyelectrolyte viscosity kumanzi acocekileyo, kwaye i-viscosity encitshisiweyo iyanda ngokunyuka koxinzelelo. I-intrinsic viscosity ye-cationic hydroxyethyl cellulose eneqondo eliphezulu lokutshintshwa inkulu kune-cationic hydroxyethyl cellulose eneqondo eliphantsi lokutshintshwa. (2) Isisombululo se-cationic hydroxyethyl cellulose sibonisa iimpawu ze-non-Newtonian fluid kunye neempawu ze-shear thinning: njengoko isisombululo sobunzima sinyuka, i-viscosity yayo ebonakalayo iyanda; kwingqungquthela ethile yesisombululo setyuwa, i-CHEC ebonakalayo i-viscosity Iyancipha ngokunyuka kwetyuwa eyongezelelweyo. Ngaphantsi komlinganiselo ofanayo we-shear, i-viscosity ebonakalayo ye-CHEC kwinkqubo yesisombululo se-CaCl2 iphezulu kakhulu kune-CHEC kwinkqubo yesisombululo se-NaCl.
Ngokuqhubekayo ukujula kophando kunye nokwandiswa okuqhubekayo kweenkalo zesicelo, iipropati zezisombululo zenkqubo exubeneyo eziqulunqwe ngee-ether ze-cellulose ezahlukeneyo nazo zifumene ingqalelo yabantu. Ngokomzekelo, i-sodium carboxymethyl cellulose (NACMC) kunye ne-hydroxyethyl cellulose (HEC) zisetyenziswa njenge-oyile yokufuduka kwiindawo zeoli, ezinenzuzo yokumelana nokucheba okuqinileyo, izinto ezininzi eziluhlaza kunye nokungcola okusingqongileyo okuncinci, kodwa umphumo wokuzisebenzisa zodwa awufanelekanga. Nangona yangaphambili ine-viscosity enhle, ichaphazeleka ngokulula kubushushu be-reservoir kunye netyuwa; nangona le yokugqibela inobushushu obulungileyo kunye nokuxhathisa kwetyuwa, ukutyeba kwayo kubi kwaye idosi inkulu ngokwentelekiso. Abaphandi baxuba izisombululo ezibini kwaye bafumanisa ukuba i-viscosity yesisombululo esidibeneyo yaba nkulu, ukuchasana kweqondo lokushisa kunye nokuxhatshazwa kwetyuwa kwaphuculwa kwinqanaba elithile, kwaye umphumo wesicelo wanyuswa. Verica Sovilj et al. baye bafunda ukuziphatha kwe-rheological yesisombululo senkqubo edibeneyo eyenziwe yi-HPMC kunye ne-NACMC kunye ne-anionic surfactant ene-viscometer ejikelezayo. Ukuziphatha kwe-rheological yenkqubo kuxhomekeke kwi-HPMC-NACMC, i-HPMC-SDS kunye ne-NACMC- (HPMC- SDS) iziphumo ezahlukeneyo zenzeke phakathi.
Iimpawu ze-rheological zezisombululo ze-cellulose ether nazo zichatshazelwa yimiba eyahlukeneyo, njengezongezo, amandla omatshini angaphandle kunye nobushushu. UTomoaki Hino et al. wafunda umphumo wokongezwa kwe-nicotine kwiipropati ze-rheological ze-hydroxypropyl methylcellulose. Kwi-25C kunye noxinzelelo olungaphantsi kwe-3%, i-HPMC ibonise ukuziphatha kwe-Newtonian fluid. Xa i-nicotine yongezwa, i-viscosity yanda, nto leyo ebonisa ukuba inikotini yandisa ukuboshwa kwe-nicotine.HPMCiimolekyuli. Inikotini apha ibonisa umphumo wetyuwa ophakamisa indawo yejeli kunye nenkungu ye-HPMC. Amandla oomatshini anjengamandla okucheba nawo aya kuba nefuthe elithile kwiipropathi ze-cellulose ether isisombululo samanzi. Ukusebenzisa i-rheological turbidimeter kunye nesixhobo esincinci sokuchitha ukukhanya kwe-engile, kufumaniseke ukuba kwisisombululo se-semi-dilute, ukwandisa izinga lokucheba, ngenxa yokuxuba ukucheba, ubushushu benguqu yenkungu yenkungu iya kwanda.
Ixesha lokuposa: Apr-28-2024