Eyona propati ibalulekileyo yesisombululo se-cellulose ether yipropati yaso ye-rheological. Iipropati ezikhethekileyo ze-rheological zee-cellulose ethers ezininzi zenza ukuba zisetyenziswe kakhulu kwiinkalo ezahlukeneyo, kwaye uphando lweepropati ze-rheological luluncedo ekuphuhlisweni kweenkalo ezintsha zesicelo okanye ekuphuculweni kwezinye iindawo zesicelo. ULi Jing waseShanghai Jiao Tong University wenze uphando olucwangcisiweyo malunga neepropati ze-rheological zei-carboxymethylcellulose (CMC), kuquka nempembelelo ye-CMC's molecular structure parameters (ubunzima be-molecular kunye ne-degree of substitution), i-concentration pH, kunye namandla e-ionic. Iziphumo zophando zibonisa ukuba i-zero-shear viscosity yesisombululo iyanda ngokunyuka kobunzima be-molecular kunye ne-degree of substitution. Ukwanda kobunzima be-molecular kuthetha ukukhula kwe-molecular chain, kwaye ukuxinana okulula phakathi kwee-molecules kwandisa i-viscosity yesisombululo; i-degree enkulu yokutshintshwa kwenza ii-molecules zoluleke ngakumbi kwisisombululo. Imeko ikhona, umthamo we-hydrodynamic mkhulu kakhulu, kwaye i-viscosity iba nkulu. I-viscosity yesisombululo samanzi se-CMC iyanda ngokunyuka kwe-concentration, ene-viscoelasticity. I-viscosity yesisombululo iyancipha ngexabiso le-pH, kwaye xa iphantsi kunexabiso elithile, i-viscosity iyanda kancinci, kwaye ekugqibeleni i-free acid yenziwa kwaye ikhawuleze. I-CMC yi-polyanionic polymer, xa yongeza i-monovalent salt ions Na+, K+ shield, i-viscosity iya kuncipha ngokufanelekileyo. Ukongezwa kwe-divalent cation Caz+ kubangela ukuba i-viscosity yesisombululo inciphe kuqala ize inyuke. Xa uxinzelelo lweCa2+ luphezulu kune-stoichiometric point, iimolekyuli zeCMC zidibana neCa2+, kwaye kukho isakhiwo esingaphezulu kwisisombululo. ULiang Yaqin, waseNorth University of China, njl.njl. usebenzise indlela ye-viscometer kunye nendlela ye-rotary viscometer ukwenza uphando olukhethekileyo malunga neempawu ze-rheological zezisombululo ezidityanisiweyo nezingqinileyo ze-modified hydroxyethyl cellulose (CHEC). Iziphumo zophando zifumanise ukuba: (1) I-Cationic hydroxyethyl cellulose ine-common polyelectrolyte viscosity behavior emanzini acocekileyo, kwaye i-viscosity enciphileyo iyanda ngokunyuka kwe-concentration. I-intrinsic viscosity ye-cationic hydroxyethyl cellulose ene-degree ephezulu yokutshintshwa inkulu kune-cationic hydroxyethyl cellulose ene-degree ephantsi yokutshintshwa. (2) Isisombululo se-cationic hydroxyethyl cellulose sibonisa iimpawu ze-non-Newtonian fluid kwaye sineempawu ze-shear thinning: njengoko uxinzelelo lobunzima besisombululo lukhula, i-viscosity yayo ebonakalayo iyanda; kwi-concentration ethile yesisombululo setyuwa, i-CHEC viscosity ebonakalayo Iyancipha ngokunyuka kwe-concentration yetyuwa eyongezelelweyo. Phantsi kwesantya esifanayo sokucheba, i-viscosity ebonakalayo ye-CHEC kwinkqubo yesisombululo se-CaCl2 iphezulu kakhulu kune-CHEC kwinkqubo yesisombululo se-NaCl.
Ngenxa yokuqhubeka kophando kunye nokwanda okuqhubekayo kwamasimi okusetyenziswa, iimpawu zezisombululo zenkqubo exutyiweyo ezenziwe ngee-ethers ezahlukeneyo ze-cellulose nazo zifumene ingqalelo yabantu. Umzekelo, i-sodium carboxymethyl cellulose (NACMC) kunye ne-hydroxyethyl cellulose (HEC) zisetyenziswa njengee-arhente zokufuduka kweoyile kwiindawo zeoyile, ezineenzuzo zokuxhathisa okunamandla, izinto eziluhlaza ezininzi kunye nongcoliseko oluncinci lokusingqongileyo, kodwa isiphumo sokuzisebenzisa zodwa asilunganga. Nangona le yokuqala ine-viscosity elungileyo, ichaphazeleka lula bubushushu be-reservoir kunye ne-salinity; nangona le yokugqibela inokumelana okuhle kwamasimi obushushu kunye netyuwa, amandla ayo okuqina aphantsi kwaye idosi inkulu kakhulu. Abaphandi baxube ezi zisombululo zimbini baza bafumanisa ukuba i-viscosity yesisombululo esidibeneyo yaba nkulu, ukumelana kwamasimi obushushu kunye netyuwa kwaphuculwa ukuya kwinqanaba elithile, kwaye isiphumo sokusetyenziswa saphuculwa. UVerica Sovilj et al. bafunde indlela yokuziphatha kwe-rheological yesisombululo senkqubo exutyiweyo eyenziwe yi-HPMC kunye ne-NACMC kunye ne-anionic surfactant ene-viscometer ejikelezayo. Ukuziphatha kwe-rheological kwenkqubo kuxhomekeke kwiziphumo ezahlukeneyo ze-HPMC-NACMC, HPMC-SDS kunye ne-NACMC- (HPMC-SDS) ezenzeka phakathi.
Iimpawu ze-rheological zezisombululo ze-cellulose ether nazo zichaphazeleka zizinto ezahlukeneyo, ezinje ngezongezo, amandla angaphandle oomatshini kunye nobushushu. UTomoaki Hino nabanye bafunde isiphumo sokongezwa kwe-nicotine kwiimpawu ze-rheological ze-hydroxypropyl methylcellulose. Kwi-25C kunye noxinzelelo olungaphantsi kwe-3%, i-HPMC ibonakalise ukuziphatha kolwelo lweNewtonian. Xa i-nicotine yongezwa, i-viscosity yanda, nto leyo ebonisa ukuba i-nicotine yonyusa ukuxinana kwe-I-HPMCiimolekyuli. I-Nicotine apha ibonisa isiphumo setyuwa esiphakamisa inqaku lejeli kunye nenqaku lenkungu ye-HPMC. Amandla oomatshini afana namandla okucheba aya kuba nefuthe elithile kwiimpawu zesisombululo samanzi se-cellulose ether. Ukusebenzisa isixhobo sokucheba i-rheological turbidimeter kunye nesixhobo sokusasazeka kokukhanya okuncinci, kufunyaniswe ukuba kwisisombululo esixutyiweyo, okwandisa izinga lokucheba, ngenxa yokuxuba i-shear, ubushushu botshintsho lwenqaku lenkungu buya kwanda.
Ixesha leposi: Epreli-28-2024