Katundu wofunika kwambiri wa yankho la cellulose ether ndi kagwiritsidwe kake ka rheological. Kapangidwe kapadera ka rheological ka ma cellulose ether ambiri kamapangitsa kuti azigwiritsidwa ntchito kwambiri m'magawo osiyanasiyana, ndipo kuphunzira za kagwiridwe ka rheological ndikothandiza pakukula kwa magawo atsopano ogwiritsira ntchito kapena kukonza magawo ena ogwiritsira ntchito. Li Jing wochokera ku Shanghai Jiao Tong University adachita kafukufuku wokhudza kagwiridwe ka rheological kacarboxymethylcellulose (CMC), kuphatikizapo mphamvu ya CMC's molecular structure parameters (kulemera kwa mamolekyulu ndi digiri ya kusintha), kuchuluka kwa pH, ndi mphamvu ya ionic. Zotsatira za kafukufuku zikusonyeza kuti zero-shear viscosity ya yankho imawonjezeka ndi kuwonjezeka kwa kulemera kwa mamolekyulu ndi digiri ya kusintha. Kuwonjezeka kwa kulemera kwa mamolekyulu kumatanthauza kukula kwa unyolo wa mamolekyulu, ndipo kusakanikirana kosavuta pakati pa mamolekyulu kumawonjezera kukhuthala kwa yankho; kuchuluka kwakukulu kwa kusintha kumapangitsa mamolekyulu kutambasuka kwambiri mu yankho. Mkhalidwe ulipo, voliyumu ya hydrodynamic ndi yayikulu, ndipo kukhuthala kumakhala kwakukulu. Kukhuthala kwa yankho lamadzi la CMC kumawonjezeka ndi kuwonjezeka kwa kukhuthala, komwe kumakhala ndi viscoelasticity. Kukhuthala kwa yankho kumachepa ndi pH, ndipo likachepa kuposa mtengo winawake, kukhuthala kumawonjezeka pang'ono, ndipo pamapeto pake asidi waulere amapangidwa ndikukhazikika. CMC ndi polyanionic polymer, powonjezera ma monovalent salt ions Na+, K+ shield, kukhuthala kumachepa moyenerera. Kuwonjezera kwa divalent cation Caz+ kumapangitsa kuti kukhuthala kwa yankho kuchepe kaye kenako kumawonjezeka. Pamene kuchuluka kwa Ca2+ kuli kokwera kuposa stoichiometric point, mamolekyu a CMC amalumikizana ndi Ca2+, ndipo pali superstructure mu yankho. Liang Yaqin, North University of China, ndi ena. adagwiritsa ntchito njira ya viscometer ndi njira ya rotational viscometer kuti achite kafukufuku wapadera pa makhalidwe a rheological a dilute ndi concentrated solutions a modified hydroxyethyl cellulose (CHEC). Zotsatira za kafukufukuyu zapeza kuti: (1) Cationic hydroxyethyl cellulose ili ndi polyelectrolyte viscosity behavior yachizolowezi m'madzi oyera, ndipo kuchepa kwa viscosity kumawonjezeka ndi kuwonjezeka kwa kuchuluka. Kukhuthala kwa cationic hydroxyethyl cellulose yokhala ndi digiri yapamwamba ya kusintha ndi kwakukulu kuposa kwa cationic hydroxyethyl cellulose yokhala ndi digiri yochepa ya kusintha. (2) Yankho la cationic hydroxyethyl cellulose limasonyeza makhalidwe osakhala a Newtonian fluid ndipo lili ndi makhalidwe ochepa a shear: pamene kuchuluka kwa yankho kukuwonjezeka, kukhuthala kwake koonekera kumawonjezeka; mu kuchuluka kwina kwa yankho la mchere, kukhuthala koonekera kwa CHEC kumachepa ndi kuwonjezeka kwa kuchuluka kwa mchere wowonjezera. Pansi pa chiŵerengero chomwecho cha kudulidwa kwa CHEC, kukhuthala kooneka kwa CHEC mu dongosolo la yankho la CaCl2 kumakhala kwakukulu kwambiri kuposa kwa CHEC mu dongosolo la yankho la NaCl.
Ndi kuzama kosalekeza kwa kafukufuku komanso kufalikira kosalekeza kwa minda yogwiritsira ntchito, makhalidwe a mayankho osakanikirana opangidwa ndi ma ether osiyanasiyana a cellulose nawonso akopa chidwi cha anthu. Mwachitsanzo, sodium carboxymethyl cellulose (NACMC) ndi hydroxyethyl cellulose (HEC) amagwiritsidwa ntchito ngati zinthu zosunthira mafuta m'minda yamafuta, zomwe zili ndi ubwino wokana kumeta tsitsi, zinthu zambiri zopangira komanso kuipitsa chilengedwe pang'ono, koma zotsatira zake zokha sizoyenera. Ngakhale yoyamba ili ndi kukhuthala kwabwino, imakhudzidwa mosavuta ndi kutentha kwa reservoir ndi mchere; ngakhale yachiwiri ili ndi kukana kutentha ndi mchere wabwino, mphamvu yake yokhuthala ndi yofooka ndipo mlingo wake ndi waukulu. Ofufuzawa adasakaniza mayankho awiriwa ndipo adapeza kuti kukhuthala kwa yankho lophatikizana kunakula, kukana kutentha ndi kukana mchere kunakula pang'ono, ndipo zotsatira zake zinawonjezeka. Verica Sovilj ndi anzake aphunzira momwe yankho la HPMC ndi NACMC ndi anionic surfactant zimagwirira ntchito ndi viscometer yozungulira. Khalidwe la rheological la dongosololi limadalira zotsatira zosiyanasiyana za HPMC-NACMC, HPMC-SDS ndi NACMC- (HPMC-SDS) zomwe zimachitika pakati pawo.
Mphamvu ya rheological ya njira za cellulose ether imakhudzidwanso ndi zinthu zosiyanasiyana, monga zowonjezera, mphamvu yakunja ya makina ndi kutentha. Tomoaki Hino ndi ena adaphunzira momwe kuwonjezera kwa nikotini kumakhudzira mphamvu ya rheological ya hydroxypropyl methylcellulose. Pa 25C ndi kuchuluka kochepera 3%, HPMC idawonetsa khalidwe la Newtonian fluid. Pamene nikotini idawonjezedwa, kukhuthala kunawonjezeka, zomwe zikusonyeza kuti nikotini idawonjezera kukhudzidwa kwaHPMCmamolekyulu. Nikotini apa imasonyeza mphamvu ya mchere yomwe imakweza mfundo ya gel ndi mfundo ya chifunga ya HPMC. Mphamvu yamakina monga mphamvu ya shear idzakhalanso ndi mphamvu inayake pa makhalidwe a yankho lamadzi la cellulose ether. Pogwiritsa ntchito rheological turbidimeter ndi chida chogawa kuwala kwa ngodya yaying'ono, zapezeka kuti mu njira yothetsera theka, kuwonjezera kuchuluka kwa shear, chifukwa cha kusakaniza shear, kutentha kwa chifunga kudzawonjezeka.
Nthawi yotumizira: Epulo-28-2024