Thepa ea bohlokoa ka ho fetisisa ea tharollo ea cellulose ether ke thepa ea eona ea rheological. Lintho tse khethehileng tsa rheological tsa li-cellulose ethers tse ngata li etsa hore li sebelisoe haholo likarolong tse sa tšoaneng, 'me ho ithuta ka thepa ea rheological ho molemo ho nts'etsopele ea masimo a macha a kopo kapa ntlafatso ea likarolo tse ling tsa kopo. Li Jing oa Univesithi ea Shanghai Jiao Tong o ile a etsa thuto e hlophisitsoeng ka thepa ea rheological eaCarboxymethylcellulose (CMC), ho kenyelletsa le tšusumetso ea liparamente tsa sebopeho sa limolek'hule tsa CMC (boima ba limolek'hule le tekanyo ea ho fetola), mahloriso pH, le matla a ionic. Liphetho tsa lipatlisiso li bontša hore viscosity ea zero-shear ea tharollo e eketseha ka ho eketseha ha boima ba molek'hule le tekanyo ea ho fetola. Keketseho ea boima ba limolek'hule e bolela ho hola ha ketane ea limolek'hule, 'me ho kena habonolo pakeng tsa limolek'hule ho eketsa viscosity ea tharollo; tekanyo e kholo ea ho nkela sebaka e etsa hore limolek'hule li otlolohe haholoanyane ka tharollo. Naha e teng, molumo oa hydrodynamic o batla o le moholo, 'me viscosity e ba kholo. The viscosity ea CMC aqueous solution e eketseha ka keketseho ea mahloriso, e nang le viscoelasticity. The viscosity ea tharollo e fokotseha ka pH ea boleng, 'me ha e le tlase ho feta boleng bo itseng, viscosity e eketseha hanyenyane,' me qetellong acid e sa lefelloeng e thehoa le ho fokotseha. CMC ke polyanionic polymer, ha o eketsa monovalent letsoai ions Na +, K + thebe, viscosity tla fokotseha ka tsela e loketseng. Keketso ea divalent cation Caz + e etsa hore viscosity ea 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 sebopeho se seholo se teng ka tharollo. Liang Yaqin, Univesithi ea Leboea ea Chaena, joalo-joalo o ile a sebelisa mokhoa oa viscometer le mokhoa oa rotational viscometer ho etsa lipatlisiso tse khethehileng mabapi le thepa ea rheological ea tharollo ea dilute le concentrated ea modified hydroxyethyl cellulose (CHEC). Liphetho tsa lipatlisiso li fumane hore: (1) Cationic hydroxyethyl cellulose e na le boitšoaro bo tloaelehileng ba polyelectrolyte viscosity metsing a hloekileng, 'me viscosity e fokotsehileng e eketseha ka keketseho ea mahloriso. The intrinsic viscosity ea cationic hydroxyethyl cellulose e nang le tekanyo e phahameng ea ho nka sebaka e kholo ho feta ea cationic hydroxyethyl cellulose e nang le tekanyo e tlaase ea ho fetola. (2) Tharollo ea cationic hydroxyethyl cellulose e bonts'a litšoaneleho tsa metsi tse seng tsa Newtonian 'me li na le litšobotsi tsa ho fokotsa sekhahla: ha tharollo ea boima e eketseha, viscosity ea eona e bonahalang e eketseha; ka motsoako o itseng oa tharollo ea letsoai, CHEC e hlakileng ea viscosity E fokotseha ka ho eketseha ha letsoai le eketsehileng. 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 kopo, thepa ea litharollo tsa sistimi e tsoakiloeng tse entsoeng ka li-ether tse fapaneng tsa cellulose le tsona li amohetse tlhokomelo ea batho. Ka mohlala, sodium carboxymethyl cellulose (NACMC) le hydroxyethyl cellulose (HEC) li sebelisoa e le lisebelisoa tsa ho tlosa oli libakeng tsa oli, tse nang le melemo ea ho hanyetsa ho kuta ka matla, lisebelisoa tse ngata tse tala le tšilafalo e fokolang ea tikoloho, empa phello ea ho e sebelisa e le 'ngoe ha e ntle. Le hoja ea pele e na le viscosity e ntle, e angoa habonolo ke mocheso oa letamo le letsoai; le hoja ea ho qetela e na le mocheso o motle le ho hanyetsa letsoai, bokhoni ba eona ba ho teteka bo fokola 'me tekanyo ea eona e batla e le khōlō. Bafuputsi ba ile ba kopanya litharollo tse peli 'me ba fumana hore viscosity ea tharollo e kopantsoeng e ile ea e-ba kholoanyane, ho hanyetsa mocheso le ho hanyetsa letsoai ho ile ha ntlafatsoa ho isa tekanyong e itseng,' me phello ea kopo e ile ea ntlafatsoa. Verica Sovilj et al. ba ithutile boitšoaro ba rheological ba tharollo ea tsamaiso e tsoakiloeng e entsoeng ka HPMC le NACMC le anionic surfactant e nang le viscometer e potolohang. Boitšoaro ba rheological ba tsamaiso bo itšetlehile ka HPMC-NACMC, HPMC-SDS le NACMC- (HPMC- SDS) liphello tse fapaneng tse etsahetseng pakeng tsa.
Thepa ea rheological ea tharollo ea cellulose ether e boetse e angoa ke lintlha tse fapaneng, joalo ka li-additives, matla a kantle a mochini le mocheso. Tomoaki Hino et al. o ithutile phello ea ho eketsoa ha nikotine ho thepa ea rheological ea hydroxypropyl methylcellulose. Ka 25C le mahloriso a ka tlase ho 3%, HPMC e bonts'itse boitšoaro ba mokelikeli oa Newtonian. Ha nicotine e eketsoa, viscosity e ile ea eketseha, e leng se ileng sa bontša hore nicotine e eketsa ho tšoasa.HPMClimolek'hule. Nikotine mona e bonts'a phello ea letsoai e phahamisang ntlha ea gel le ntlha ea moholi ea HPMC. Matla a mechine a kang matla a ho kuta a tla boela a be le tšusumetso e itseng matlotlong a selulose ether aqueous solution. Ho sebelisa rheological turbidimeter le seletsa se senyenyane sa ho hasanya leseli, ho fumanoa hore ka tharollo ea semi-dilute, ho eketsa sekhahla sa ho kuta, ka lebaka la ho kopanya ho kuta, mocheso oa phetoho oa ntlha ea moholi o tla eketseha.
Nako ea poso: Apr-28-2024