Thepa ea bohlokoa ka ho fetisisa ea tharollo ea ether ea cellulose ke thepa ea eona ea rheological. Thepa e ikhethang ea rheological ea li-ether tse ngata tsa cellulose e etsa hore li sebelisoe haholo masimong a fapaneng, 'me thuto ea thepa ea rheological e molemo ho nts'etsopele ea masimo a macha a ts'ebeliso kapa ntlafatso ea masimo a mang a ts'ebeliso. Li Jing oa Shanghai Jiao Tong University o entse thuto e hlophisitsoeng mabapi le thepa ea rheological eacarboxymethylcellulose (CMC), ho kenyeletsoa le tshusumetso ya diparamitha tsa sebopeho sa dimolek'hule tsa CMC (boima ba dimolek'hule le tekanyo ya phetolo), pH ya mahloriso, le matla a ionic. Diphuputso di bontsha hore viscosity ya lefela ya tharollo e eketseha ka keketseho ya boima ba dimolek'hule le tekanyo ya phetolo. Keketseho ya boima ba dimolek'hule e bolela kgolo ya ketane ya dimolek'hule, mme ho kopana ha bonolo pakeng tsa dimolek'hule ho eketsa viscosity ya tharollo; tekanyo e kgolo ya phetolo e etsa hore dimolek'hule di otlolohe haholoanyane ka hara tharollo. Boemo bo teng, bophahamo ba hydrodynamic bo boholo haholo, mme viscosity e ba kgolo. Viscosity ya tharollo ya metsi ya CMC e eketseha ka keketseho ya mahloriso, e nang le viscoelasticity. Viscosity ya tharollo e fokotseha ka boleng ba pH, mme ha e le tlase ho feta boleng bo itseng, viscosity e eketseha hanyane, mme qetellong asiti e lokolohileng e a thehwa mme e a potlaka. CMC ke polymer ya polyanionic, ha ho eketswa di-ion tsa letsoai tsa monovalent Na+, K+, viscosity e tla fokotseha ka ho ya ka moo. Ho eketswa ha divalent cation Caz+ ho etsa hore viscosity ya tharollo e fokotsehe pele ebe e eketseha. Ha mahloriso a Ca2+ a phahame ho feta ntlha ea stoichiometric, limolek'hule tsa CMC li sebelisana le Ca2+, 'me ho na le sebopeho se seholo ka har'a tharollo. Liang Yaqin, North University of China, jj., o sebelisitse mokhoa oa viscometer le mokhoa oa rotational viscometer ho etsa lipatlisiso tse khethehileng mabapi le litšobotsi tsa rheological tsa litharollo tse hlapolotsoeng le tse kopaneng tsa modified hydroxyethyl cellulose (CHEC). Liphetho tsa lipatlisiso li fumane hore: (1) Cationic hydroxyethyl cellulose e na le mokhoa o tloaelehileng oa ho thothomela ha polyelectrolyte metsing a hloekileng, 'me ho thothomela ho fokotsehileng hoa eketseha ka keketseho ea mahloriso. Ho thothomela ha tlhaho ha cationic hydroxyethyl cellulose ka tekanyo e phahameng ea ho nkeloa sebaka ho hoholo ho feta ha cationic hydroxyethyl cellulose ka tekanyo e tlase ea ho nkeloa sebaka. (2) Tharollo ea cationic hydroxyethyl cellulose e bonts'a litšobotsi tsa mokelikeli o seng oa Newtonian 'me e na le litšobotsi tsa ho thiba ha shear: ha mahloriso a boima ba tharollo a ntse a eketseha, ho thothomela ha eona ho bonahalang hoa eketseha; mahlorisong a itseng a tharollo ea letsoai, ho thothomela ha CHEC ho bonahala hoa fokotseha ka keketseho ea mahloriso a letsoai a ekelitsoeng. Tlas'a sekhahla se tšoanang sa ho kuta, viscosity e bonahalang ea CHEC tsamaisong ea tharollo ea CaCl2 e phahame haholo ho feta ea CHEC tsamaisong ea tharollo ea NaCl.
Ka ho teba ho tsoelang pele ha lipatlisiso le katoloso e tsoelang pele ea masimo a ts'ebeliso, thepa ea litharollo tsa sistimi e tsoakiloeng tse entsoeng ka li-ether tse fapaneng tsa cellulose le tsona li hapile tlhokomelo ea batho. Mohlala, sodium carboxymethyl cellulose (NACMC) le hydroxyethyl cellulose (HEC) li sebelisoa e le li-agent tsa ho falla ha oli masimong a oli, a nang le melemo ea ho hanyetsa ho matla ha ho beola, thepa e tala e ngata le tšilafalo e fokolang ea tikoloho, empa phello ea ho li sebelisa feela ha e ntle. Le hoja ea pele e na le viscosity e ntle, e angoa habonolo ke mocheso oa polokelo le letsoai; le hoja ea morao e na le mocheso o motle le ho hanyetsa letsoai, bokhoni ba eona ba ho teteana bo fokola 'me tekanyo e kholo haholo. Bafuputsi ba kopantse litharollo tsena tse peli 'me ba fumane hore viscosity ea tharollo e kopaneng e ile ea eketseha, khanyetso ea mocheso le khanyetso ea letsoai li ntlafalitsoe ho isa bohōleng bo itseng,' me phello ea ts'ebeliso e ile ea ntlafala. Verica Sovilj le ba bang ba ithutile boitšoaro ba rheological ba tharollo ea sistimi e tsoakiloeng e entsoeng ka HPMC le NACMC le anionic surfactant e nang le viscometer e potolohang. Boitšoaro ba rheological ba sistimi bo itšetlehile ka liphello tse fapaneng tsa HPMC-NACMC, HPMC-SDS le NACMC- (HPMC-SDS) tse etsahetseng lipakeng tsa.
Thepa ea rheological ea litharollo tsa ether tsa cellulose le eona e angoa ke lintlha tse fapaneng, tse kang li-additives, matla a kantle a mechini le mocheso. Tomoaki Hino le ba bang ba ithutile phello ea ho eketsoa ha nikotine holim'a thepa ea rheological ea hydroxypropyl methylcellulose. Ho 25C le mahloriso a ka tlase ho 3%, HPMC e bontšitse boitšoaro ba mokelikeli oa Newtonian. Ha nikotine e eketsoa, viscosity e ile ea eketseha, e leng se ileng sa bontša hore nikotine e ekelitse ho hokahana haHPMClimolek'hule. Nikotine mona e bonts'a phello ea letsoai e phahamisang ntlha ea gel le ntlha ea moholi ea HPMC. Matla a mechini joalo ka matla a ho beola a tla boela a be le tšusumetso e itseng holim'a thepa ea tharollo ea metsi ea cellulose ether. Ho sebelisoa sesebelisoa sa rheological turbidimeter le sesebelisoa se senyenyane sa ho hasanya mabone a sekhutlo se senyenyane, ho fumanoa hore tharollong e semi-dilute, e eketsang sekhahla sa ho beola, ka lebaka la ho kopanya ho beola, mocheso oa phetoho oa ntlha ea moholi o tla eketseha.
Nako ea poso: Mmesa-28-2024