Cov cuab yeej tseem ceeb tshaj plaws ntawm cellulose ether daws yog nws cov cuab yeej siv rheological. Cov yam tshwj xeeb ntawm ntau tus neeg ua haujlwm cellulose ua rau lawv muaj dav siv nyob rau hauv ntau daim teb thov lossis kev txhim kho ntawm qee cov ntawv thov. Li jing los ntawm Shanghai Jiao Tong University ua qhov kev kawm ua haujlwm ntawm kev kawm ntawm cov yam ntxwv ntawmCarboxymetylcellulose (cmc), suav nrog cov cawv ntawm cmc cov qauv molecular (molecular hnyav thiab qib hloov chaw), kev hloov kho pH, thiab muaj zog. Cov txiaj ntsig kev tshawb fawb qhia tau tias lub xoom-shear viscosity ntawm kev daws teeb meem nce nrog qhov nce ntawm cov kev hnyav thiab qhov degree ntawm kev hloov pauv. Qhov nce ntawm cov molecular hnyav txhais tau tias yog kev loj hlob ntawm cov molecular, thiab yooj yim entanglement ntawm cov lwg me me nce viscosity ntawm kev daws teeb meem; Cov qib loj ntawm kev hloov pauv cov lwg me me ntxiv rau hauv kev daws teeb meem. Lub xeev tshwm sim, ntim tshuab hydrodynamic yog cov loj, thiab viscosity yuav loj. Lub viscosity ntawm CMC aqueous kua nce nrog nce kev nce siab, uas muaj cov visoelasticity. Lub viscosity ntawm kev daws teeb meem tsawg dua nrog tus nqi pH, thiab thaum nws qis dua li qee tus nqi, lub ab viscosity nce me ntsis, thiab thaum kawg dawb acid yog tsim thiab precipitated. CMC yog polyanionic polymer, thaum ntxiv monovalent ntsev ions na +, k + daim thaiv npog, lub viscosity yuav txo qis kom tsawg. Qhov sib ntxiv ntawm cov khoom siv sib txawv cation cors CAZ + ua rau lub tshuaj tua kab mob ntawm kev txo qis ua ntej thiab tom qab ntawd nce ntxiv. Thaum cov concentration ntawm CA2 + yog siab dua tus Stoichiometric Point, CMC Molecules sib cuam tshuam nrog CA2 +, thiab ib qho ntxiv los nyob hauv qhov kev daws teeb meem. Liang Yaqin, North University of Suav, thiab lwm yam. Siv cov kev tshawb fawb viscometer ntawm kev hloov kho cov tshuaj lom neeg hydroxyethyl cellulose (chec). Cov kev tshawb fawb tau pom tias: (1) Cationic hydrotyl cellulose muaj cov dej ntshiab polyelcority nyob rau hauv cov dej ntshiab, thiab cov txo viscosity nce nrog kev nce ntawm kev nce siab. Cov viscosic intrinsic ntawm cationic hydroxyethyl cellulose nrog qib siab ntawm cationic hydrocyethyl cellulose nrog tsawg kawg ntawm kev hloov pauv. (2) kev daws teeb meem ntawm cationic hydrotyl cellulose cov khoom pov thawj tsis-tshiab haluonian cov yam ntxwv nce, nws pom meej viscosity nce; Hauv qee qhov kev xav ntawm cov ntsev daws, chec pom meej viscosity nws txo qis nrog kev nce ntawm cov ntsev ntxiv. Nyob rau hauv tib tus nqi shear, lub meej viscosity ntawm Chec hauv Cacl2 daws teeb meem yog qhov siab dua li ntawm Chec hauv NaCL daws teeb meem.
Nrog rau kev txuas ntxiv mus ntxiv ntawm kev tshawb fawb thiab kev nthuav dav txuas ntxiv, cov khoom ntawm cov neeg hais txawv ntawm cellulose kuj tau txais tib neeg cov neeg mloog. Piv txwv li, sodium carboxymethyl cellulose (NACMC) thiab cov khoom noj muaj zog ntawm cov roj av, tab sis siv cov txiaj ntsig tsawg tsis zoo. Txawm hais tias tus qub muaj viscosity zoo, nws yog yooj yim cuam tshuam los ntawm reservoir kub thiab salinity; Txawm hais tias tom kawg muaj qhov kub muaj qhov kub thiab ntsev tsis kam, nws lub peev xwm thickened tsis zoo thiab noj ntau. Cov kws tshawb fawb sib xyaw ob txoj kev daws teeb meem thiab pom tias cov tshuaj tua kab mob loj dua, cov txiaj ntsig kub ua tau zoo dua rau qee yam, thiab cov ntawv thov tau zoo dua. Verica Sovilj li al. Tau kawm txog kev coj tus cwj pwm ntawm kev daws teeb meem ntawm HPMC thiab nacmc thiab anionic surfactant nrog lub puscometer. Rheological tus cwj pwm ntawm lub system nyob ntawm HPMC-NACMC, HPMC-SDS thiab NACCC- (HPMC- (HPMC- Cov teebmeem tshwm sim ntawm.
Cov kev ua kom muaj zog ntawm cellulose ether cov kev daws teeb meem tseem cuam tshuam los ntawm ntau yam, xws li cov tshuaj ntxiv, sab nraud mechanical zog thiab kub. Tomoaki Hino li al. Kawm txog cov nyhuv ntawm qhov kev sib ntxiv ntawm nicotine ntawm rheological cov yam ntxwv ntawm hydroxypropylropeny. Ntawm 25C thiab ib qho kev xav tau qis dua 3%, HPMC ua rau pom kev coj ua kua dej tshiab. Thaum nicotine tau ntxiv, viscosity nce, uas qhia tias nicotine nce qhov kev ua haujlwm ntawmHPMCmolecules. Nicotine ntawm no nthuav qhia cov nyhuv salting uas tsa cov gel point thiab huab taw tes ntawm HPMC. Mechanical zog xws li shear zog yuav muaj qee yam cuam tshuam rau cov khoom ntawm cellulose auve aqu aque. Siv Rheological Turidimeter thiab me me lub teeb tawg, nce cov kab mob shear, vim yog cov kev hloov pauv, qhov kev hloov pauv ntawm huab cua yuav nce ntxiv.
Lub Sijhawm Post: Apr-28-2024