Ihe kachasị mkpa nke ngwọta cellulose ether bụ ihe onwunwe rheological ya. Njirimara rheological pụrụ iche nke ọtụtụ cellulose ethers na-eme ka ha jiri ya mee ihe n'ọtụtụ ebe, na ọmụmụ ihe gbasara rheological bara uru maka mmepe nke ngwa ngwa ọhụrụ ma ọ bụ mmelite nke ụfọdụ ngwa ngwa. Li Jing si Shanghai Jiao Tong University mere a Ịhazi ọmụmụ banyere rheological Njirimara nkeCarboxymethylcellulose (CMC), gụnyere mmetụta nke usoro ihe owuwu molekụla CMC (ịdị arọ molekụla na ogo nke nnọchi), pH ntinye uche, na ike ionic. Nsonaazụ nyocha na-egosi na viscosity efu nke ngwọta na-abawanye site na mmụba nke ịdị arọ molekụla na ogo nke nnọchi. Mmụba nke molekụla ịdị arọ pụtara uto nke agbụ molekụla, na njikọ dị mfe n'etiti ụmụ irighiri ihe na-abawanye viscosity nke ngwọta; nnukwu ogo nke nnọchi na-eme ka ụmụ irighiri ihe na-agbatịkwu na ngwọta. Ala dị adị, olu hydrodynamic dị oke ibu, na viscosity na-aghọ nnukwu. Viscosity nke CMC aqueous ngwọta na-abawanye na mmụba nke itinye uche, nke nwere viscoelasticity. Viscosity nke ngwọta na-ebelata na uru pH, ma mgbe ọ dị ala karịa otu uru, viscosity na-abawanye ntakịrị, n'ikpeazụkwa, a na-emepụta acid free na precipitated. CMC bụ polymer polyanionic, mgbe ị na-agbakwunye monovalent nnu ions Na +, K+ ọta, viscosity ga-ebelata ya. Mgbakwunye nke divalent cation Caz+ na-eme ka viscosity nke ngwọta na-ebelata na mbụ wee mụbaa. Mgbe ntinye nke Ca2 + dị elu karịa ebe stoichiometric, ụmụ irighiri CMC na-emekọrịta ihe na Ca2 +, na ihe dị elu dị na ngwọta. Liang Yaqin, North University of China, wdg ji usoro viscometer na rotational viscometer usoro na-eduzi pụrụ iche nnyocha na rheological Njirimara nke dilute na itinye uche ngwọta nke modified hydroxyethyl cellulose (CHEC). Nsonaazụ nyocha chọpụtara na: (1) Cationic hydroxyethyl cellulose nwere omume viscosity polyelectrolyte na-ahụkarị na mmiri dị ọcha, na mbelata viscosity na-abawanye na mmụba nke itinye uche. Viscosity dị n'ime nke cationic hydroxyethyl cellulose nwere ogo dị elu nke nnọchi dị ukwuu karịa nke cationic hydroxyethyl cellulose nwere ogo dị ala nke nnọchi. (2) Ngwọta nke cationic hydroxyethyl cellulose na-egosipụta àgwà mmiri na-abụghị Newtonian ma nwee àgwà thinning nke shear: dị ka ngwọta uka ntinye uche na-abawanye, viscosity ya pụtara ìhè na-abawanye; N'ime otu ntinye nke ngwọta nnu, CHEC pụtara viscosity Ọ na-ebelata na mmụba nke ntinye nnu agbakwunyere. N'okpuru otu ọnụ ọgụgụ shear ahụ, viscosity pụtara ìhè nke CHEC na usoro ngwọta CaCl2 dị elu nke ukwuu karịa nke CHEC na sistemụ ngwọta NaCl.
Na-aga n'ihu na-eme nnyocha na-aga n'ihu na mgbasawanye nke ngwa ngwa, Njirimara nke agwakọta usoro ngwọta mejupụtara dị iche iche cellulose ethers enwetawokwa ndị mmadụ anya. Dịka ọmụmaatụ, a na-eji sodium carboxymethyl cellulose (NACMC) na hydroxyethyl cellulose (HEC) mee ihe dị ka ndị na-akwagharị mmanụ na mmanụ mmanụ, nke nwere uru nke nguzogide siri ike, nnukwu ihe ọkụkụ na obere mmetọ gburugburu ebe obibi, ma mmetụta nke iji ha naanị adịghị mma. Ọ bụ ezie na nke mbụ nwere ezigbo viscosity, ọ na-adị mfe site na mmiri mmiri okpomọkụ na salinity; ọ bụ ezie na nke ikpeazụ nwere ezigbo okpomọkụ na nnu nguzogide nnu, ikike ya siri ike adịghị mma na usoro onunu ogwu dị ntakịrị. Ndị nchọpụta ahụ jikọtara ihe ngwọta abụọ ahụ wee chọpụta na viscosity nke ihe ngwọta nke mgbagwoju anya na-abawanye ụba, a na-eme ka nguzogide okpomọkụ na nnu nnu dị mma ruo n'ókè ụfọdụ, na-eme ka mmetụta ngwa ahụ dịkwuo mma. Verica Sovilj et al. amụwo omume rheological nke ngwọta nke usoro agwakọta nke HPMC na NACMC na anionic surfactant nwere viscometer rotational. The rheological omume nke usoro na-adabere HPMC-NACMC, HPMC-SDS na NACMC- (HPMC- SDS) dị iche iche mmetụta mere n'etiti.
The rheological Njirimara nke cellulose ether ngwọta na-emetụtakwa dị iche iche ihe, dị ka ihe mgbakwunye, mpụga n'ibu ike na okpomọkụ. Tomoaki Hino et al. mụọ mmetụta nke mgbakwunye nicotine na rheological Njirimara nke hydroxypropyl methylcellulose. Na 25C na ntinye uche dị ala karịa 3%, HPMC gosipụtara omume mmiri Newtonian. Mgbe agbakwunyere nicotine, viscosity na-abawanye, nke gosipụtara na nicotine na-abawanye njikọ nkeHPMCụmụ irighiri ihe. Nicotine ebe a na-egosipụta mmetụta nnu nke na-ebuli ebe gel na ebe foogu nke HPMC. Mechanical ike dị ka shear ike ga-enwekwa ụfọdụ mmetụta na Njirimara nke cellulose ether aqueous ngwọta. N'iji turbidimeter rheological na obere nkuku ọkụ na-ekesa ngwá ọrụ, a na-achọpụta na na ngwọta nke ọkara-dilute, na-amụba ọnụ ọgụgụ shear, n'ihi na-agwakọta shear, mgbanwe okpomọkụ nke ebe foogu ga-abawanye.
Oge nzipu: Eprel-28-2024