Ihe kacha mkpa dị na ihe ngwọta ether cellulose bụ ihe onwunwe ya. Njirimara rheological pụrụ iche nke ọtụtụ ether cellulose na-eme ka ha bụrụ ihe a na-ejikarị eme ihe n'ọtụtụ ngalaba, ọmụmụ ihe nke ihe onwunwe rheological bara uru maka mmepe nke ubi ngwa ọhụrụ ma ọ bụ imeziwanye ụfọdụ ubi ngwa. Li Jing si Mahadum Jiao Tong nke Shanghai mere nnyocha usoro gbasara ihe onwunwe rheological nkecarboxymethylcellulose (CMC), gụnyere mmetụta nke paramita nhazi molekul nke CMC (ibu molekul na ogo nnọchi), pH njupụta, na ike ionic. Nsonaazụ nyocha ahụ na-egosi na viscosity efu nke ngwọta ahụ na-abawanye ka mmụba nke ibu molekul na ogo nnọchi. Mmụba nke ibu molekul pụtara uto nke yinye molekul, na njiko dị mfe n'etiti molekul na-eme ka viscosity nke ngwọta ahụ dịkwuo elu; nnukwu oke nnọchi na-eme ka molekul ahụ gbasaa karịa na ngwọta ahụ. Ọnọdụ ahụ dị, olu hydrodynamic buru ibu, viscosity na-aghọkwa nnukwu. viscosity nke mmiri mmiri CMC na-abawanye ka mmụba nke ntinye, nke nwere viscoelasticity. viscosity nke ngwọta ahụ na-ebelata na uru pH, mgbe ọ dị ala karịa uru ụfọdụ, viscosity na-abawanye ntakịrị, ma n'ikpeazụ a na-emepụta acid efu ma na-akpalite. CMC bụ polyanionic polymer, mgbe ọ na-agbakwunye ions nnu Monovalent Na+, K+ shield, viscosity ga-ebelata dịka o kwesịrị. Mgbakwunye nke divalent cation Caz+ na-eme ka viscosity nke ngwọta ahụ belata na mbụ wee mụbaa. Mgbe njupụta nke Ca2+ dị elu karịa ebe stoichiometric, molekul CMC na-akpakọrịta na Ca2+, e nwekwara nnukwu nhazi dị na ngwọta ahụ. Liang Yaqin, Mahadum North nke China, wdg. jiri usoro viscometer na usoro viscometer ntụgharị mee nnyocha pụrụ iche na njirimara rheological nke ngwọta diluted na concentrated nke hydroxyethyl cellulose agbanwere agbanwe (CHEC). Nsonaazụ nyocha ahụ chọpụtara na: (1) Cationolu hydroxyethyl cellulose nwere àgwà polyelectrolyte viscosity nkịtị na mmiri dị ọcha, viscosity belatara na-abawanye ka njupụta. viscosity dị n'ime nke cationic hydroxyethyl cellulose nwere nnukwu nguzogide dị ukwuu karịa nke cationic hydroxyethyl cellulose nwere obere nkwụsịtụ. (2) Ngwọta nke cationic hydroxyethyl cellulose na-egosipụta njirimara mmiri na-abụghị Newtonian ma nwee njirimara shear thinning: ka njupụta nke ngwọta na-abawanye, viscosity ya doro anya na-abawanye; na njupụta nke ngwọta nnu ụfọdụ, viscosity doro anya CHEC Ọ na-ebelata ka mmụba nke njupụta nnu agbakwunyere. N'okpuru otu ọnụego nkụcha ahụ, viscosity doro anya nke CHEC na sistemụ ngwọta CaCl2 dị elu nke ukwuu karịa nke CHEC na sistemụ ngwọta NaCl.
Site na mmụba nke nnyocha na mmụba nke ubi ngwa, njirimara nke ngwọta sistemụ agwakọtara nke mejupụtara ether cellulose dị iche iche enwetawokwa nlebara anya ndị mmadụ. Dịka ọmụmaatụ, a na-eji sodium carboxymethyl cellulose (NACMC) na hydroxyethyl cellulose (HEC) dị ka ihe na-eme ka mmanụ na-agagharị n'ọhịa mmanụ, nke nwere uru nke iguzogide ike siri ike, ọtụtụ ihe eji emepụta ihe na obere mmetọ gburugburu ebe obibi, mana mmetụta nke iji ha naanị abụghị ihe kacha mma. Ọ bụ ezie na nke mbụ nwere ezigbo viscosity, okpomọkụ na nnu na-emetụta ya ngwa ngwa; ọ bụ ezie na nke ikpeazụ nwere ezigbo okpomọkụ na nguzogide nnu, ikike ya siri ike adịghị mma ma ọnụọgụ ya buru ibu. Ndị nchọpụta ahụ gwakọtara ngwọta abụọ ahụ wee chọpụta na viscosity nke ngwọta mejupụtara ahụ buru ibu, e meziwanye iguzogide okpomọkụ na nguzogide nnu ruo n'ókè ụfọdụ, a mụkwara mmetụta ojiji. Verica Sovilj et al. amụọla omume rheological nke ngwọta nke sistemụ agwakọtara nke mejupụtara HPMC na NACMC na anionic surfactant na viscometer na-agbanwe agbanwe. Omume rheological nke sistemụ ahụ dabere na mmetụta dị iche iche nke HPMC-NACMC, HPMC-SDS na NACMC- (HPMC-SDS) mere n'etiti.
Ihe dị iche iche na-emetụtakwa ihe ndị dị na rheological nke ihe ngwọta cellulose ether, dịka ihe mgbakwunye, ike mekaniki mpụga na okpomọkụ. Tomoaki Hino na ndị otu ya mụrụ mmetụta nke mgbakwunye nicotine na ihe ndị dị na rheological nke hydroxypropyl methylcellulose. Na 25C na mkpokọta dị ala karịa 3%, HPMC gosipụtara omume mmiri Newtonian. Mgbe etinyere nicotine, viscosity mụbara, nke gosiri na nicotine mụbara njikọ nkeHPMCmolekul. Nicotine ebe a na-egosipụta mmetụta nnu nke na-ebuli isi gel na isi ntụ ntụ nke HPMC. Ike igwe dị ka ike ịkpụ ga-enwekwa mmetụta ụfọdụ na ihe onwunwe nke mmiri mmiri cellulose ether cellulose. Site na iji turbidimeter rheological na obere ngwa mgbasa ọkụ n'akụkụ, achọpụtara na na mmiri ọkara-dilute, na-abawanye ọnụego ịkpụ, n'ihi ngwakọta ịkpụ, okpomọkụ mgbanwe nke isi ntụ ntụ ga-abawanye.
Oge ozi: Eprel-28-2024