Chinhu chinonyanya kukosha chemushonga we cellulose ether ndicho chinhu chayo che rheological. Hunhu hwe rheological hwema cellulose ethers akawanda hunoita kuti ashandiswe zvakanyanya muminda yakasiyana-siyana, uye kudzidza nezvehunhu hwe rheological kunobatsira mukuvandudza minda mitsva yekushandisa kana kuvandudza mimwe minda yekushandisa. Li Jing wekuShanghai Jiao Tong University akaita ongororo yakarongeka pamusoro pehunhu hwe rheological hwecarboxymethylcellulose (CMC), kusanganisira pesvedzero yemaparamita eCMC echimiro chemamorekuru (huremu hwemorekuru uye mwero wekutsiva), pH yehuwandu, uye simba reionic. Mhedzisiro yekutsvagisa inoratidza kuti zero-shear viscosity yemhinduro inowedzera nekuwedzera kwehuremu hwemorekuru uye mwero wekutsiva. Kuwedzera kwehuremu hwemorekuru zvinoreva kukura kwecheni yemamorekuru, uye nyore kusangana pakati pemamorekuru kunowedzera viscosity yemhinduro; mwero mukuru wekutsiva unoita kuti mamorekuru atambanuke zvakanyanya mumhinduro. Mamiriro acho aripo, vhoriyamu yehydrodynamic yakakura, uye viscosity inova yakakura. Viscosity yeCMC aqueous solution inowedzera nekuwedzera kwehuwandu, iyo ine viscoelasticity. Viscosity yemhinduro inoderera ne pH value, uye kana iri pasi pane imwe kukosha, viscosity inowedzera zvishoma, uye pakupedzisira free acid inoumbwa uye inokonzereswa. CMC ipolyanionic polymer, painowedzera monovalent salt ions Na+, K+ shield, viscosity inoderera zvinoenderana. Kuwedzera kwe divalent cation Caz+ kunoita kuti viscosity yemhinduro iderere kutanga yozowedzera. Kana huwandu hweCa2+ hwakakwira kupfuura stoichiometric point, maCMC molecules anosangana neCa2+, uye pane superstructure iri mumhinduro. Liang Yaqin, North University of China, nezvimwewo. vakashandisa nzira yeviscometer uye nzira yerotational viscometer kuti vaite tsvakiridzo yakakosha pamusoro pehunhu hwerheological hwe dilute uye concentrated solutions ye modified hydroxyethyl cellulose (CHEC). Mhedzisiro yekutsvagisa yakawana kuti: (1) Cationic hydroxyethyl cellulose ine typical polyelectrolyte viscosity behavior mumvura yakachena, uye kuderera kwe viscosity kunowedzera nekuwedzera kwe concentration. Kuwanda kwe cationic hydroxyethyl cellulose ine high degree of substitution kwakakura kupfuura kwe cationic hydroxyethyl cellulose ine low degree of substitution. (2) Mhinduro ye cationic hydroxyethyl cellulose inoratidza non-Newtonian fluid hunhu uye ine shear thinning hunhu: sezvo solution mass concentration inowedzera, viscosity yayo inooneka inowedzera; mune imwe concentration ye salt solution, CHEC apparent viscosity Inoderera nekuwedzera kwekuwedzera kwe salt concentration. Pasi pemuyero mumwe chete wekuchekwa kwesimbi, viscosity inooneka yeCHEC muCaCl2 solution system yakakwira zvakanyanya kupfuura yeCHEC muNaCl solution system.
Nekuenderera mberi kwekutsvaga uye kuwedzera kuri kuita minda yekushandisa, hunhu hwemhinduro dzakasanganiswa dzakagadzirwa ne ether dzakasiyana dze cellulose hwave kutariswa nevanhu. Semuenzaniso, sodium carboxymethyl cellulose (NACMC) uye hydroxyethyl cellulose (HEC) zvinoshandiswa sezvinhu zvinobvisa mafuta munzvimbo dzemafuta, dzine zvakanakira zvekudzivirira kupisa, zvinhu zvakawanda uye kusvibiswa kushoma kwezvakatipoteredza, asi mhedzisiro yekuzvishandisa chete haina kunaka. Kunyangwe yekutanga ine viscosity yakanaka, inokanganiswa nyore nyore nekupisa kwemugodhi uye munyu; kunyangwe yekupedzisira ine viscosity yakanaka uye munyu, kugona kwayo kukora kwakaderera uye chiyero chakakura. Vaongorori vakasanganisa mhinduro mbiri idzi ndokuona kuti viscosity yemhinduro yakagadzirwa yakava yakakura, viscosity yekupisa uye munyu zvakavandudzwa kusvika pamwero wakati, uye mhedzisiro yekushandiswa yakawedzerwa. Verica Sovilj nevamwe vake vakadzidza maitiro e rheological emhinduro yesystem yakasanganiswa yakagadzirwa neHPMC neNACMC uye anionic surfactant ine rotational viscometer. Maitiro e rheological ehurongwa anoenderana ne HPMC-NACMC, HPMC-SDS uye NACMC- (HPMC-SDS) mhedzisiro dzakasiyana dzakaitika pakati.
Hunhu hwe rheological hwe cellulose ether solutions hunokanganiswawo nezvinhu zvakasiyana-siyana, zvakaita sekuwedzera, simba rekunze uye tembiricha. Tomoaki Hino nevamwe vakadzidza mhedzisiro yekuwedzera nicotine pahunhu hwe rheological hwe hydroxypropyl methylcellulose. Pa25C uye huwandu hwakaderera pane 3%, HPMC yakaratidza hunhu hweNewtonian fluid. Apo nicotine yakawedzerwa, viscosity yakawedzera, izvo zvakaratidza kuti nicotine yakawedzera kubatwa kweHPMCmamorekuru. Nicotine pano inoratidza munyu unosimudza gel point uye fog point yeHPMC. Simba remuchina rakadai se shear force richavewo nepesvedzero yakati pahunhu hwe cellulose ether aqueous solution. Uchishandisa rheological turbidimeter uye small angle light scattering instrument, zvinowanikwa kuti mu semi-dilute solution, zvichiwedzera shear rate, nekuda kwekusanganisa shear, tembiricha yekuchinja kwe fog point ichawedzera.
Nguva yekutumira: Kubvumbi-28-2024