Izinto Ezithinta I-Viscosity Yezixazululo Ze-HEC: Imibono Ebalulekile Yezicelo Zezimboni

1.Isisindo se-Molecular kanye neDegree ye-Polymerization

Isisindo samangqamuzana e-HEC sithinta ngokuqondile i-viscosity yayo. Ama-polymers anesisindo samangqamuzana aphezulu enza amaketanga amade, abambene kakhulu ekuxazululeni, okuholela ekwandeni kwe-viscosity. Isibonelo, ucwaningo lubonisa ukuthi i-HEC enezinga eliphakeme le-polymerization (DP) yakha izakhiwo ezinamandla ezifana nejeli, ezithuthukisa ukugcinwa kwamanzi odakeni olusekelwe kusimende. Izicelo zezimboni ngokuvamile zidinga ukulinganisa isisindo samangqamuzana nokusebenza kahle—i-DP HEC ephakeme ingase ithuthukise ukunamathela kodwa ingase ivimbele ukugeleza kodaka oluzilinganisa ngokwalo.

2.Ukugxilwa kwe-HEC kusixazululo

I-Viscosity ikhuphuka kakhulu ngokugxila kwe-HEC. Ezindaweni zokugxila eziphansi (isb, 0.2–0.5% odakeni lukasimende), i-HEC yenza uketshezi lwe-pseudoplastic olugcina ukusebenza ngenkathi lumelana nokuwohloka. Kodwa-ke, ukweqa amazinga afanele (isb.,> 1%) kungaholela ekushubeni okudlulele, ukuxuba nokufaka inkimbinkimbi. Ucwaningo lwezinhlelo ze-HEC-alumina lubonisa ukuthi u-500 ppm HEC uzinzisa ngokuphawulekayo ukumiswa okwesikhashana ngokusebenzisa isithiyo esiqinile, kodwa ukugxila okuphansi (100 ppm) kudinga ama-surfactants ukuze kube nemiphumela efanayo.

3.Izinga lokushisa Effects

Umbukiso wezixazululo ze-HECi-viscosity encike ekushiseni. Njengoba izinga lokushisa likhuphuka, inkontileka ye-polymer ngenxa yokuncipha kwe-hydrogen bonding, ukwehlisa umthamo we-hydrodynamic kanye ne-viscosity. Isibonelo, ku-40°C, i-viscosity ye-HEC ingehla ngo-30-50%, kube nomthelela ekusebenzeni ezindaweni ezishisayo. Nokho, i-HEC igcina ukuzinza kufika ku-90°C, okuyenza ifaneleke ezinqubweni zokushisa okuphezulu njengokumba uwoyela.

4.I-Shear Rate kanye Nokuziphatha Kwe-Pseudoplastic

Izixazululo ze-HEC ziyiukugunda ukugunda, okusho ukuthi i-viscosity iyancipha ngaphansi kwengcindezi yemishini (isb, ukuxuba noma ukupompa). Lesi sakhiwo siqinisekisa ukusetshenziswa okulula kodaka nopende ngenkathi kugcinwa ukubumbana ngesikhathi sokuphumula. Isibonelo, udaka oluplasta nge-HEC luhlala lusebenza ngesikhathi sokudonsa kodwa lumelana nokuwohloka kwangemva kokufaka isicelo.

5.I-pH kanye namandla e-Ionic

Imvelo ye-HEC engeyona i-ionic iyenza ingazweli ku-pH uma iqhathaniswa nama-polymer e-ionic. Kodwa-ke, amazinga e-pH adlulele noma amandla aphezulu e-ionic angashintsha ukuziphatha kwesixazululo. Ezimweni ze-acidic (pH

6.Izithasiselo kanye ne-Co-Solutes

Ukuba khona koketshezi lwe-ionic, ama-surfactants, noma usawoti kulungisa i-HEC viscosity. Ngokwesibonelo:

• I-Ionic Liquids: Ukwengeza i-1-butyl-3-methylimidazolium bromide kunciphisa i-viscosity ye-HEC ngokuphazamisa ukusebenzisana kwamanzi e-polymer.
• Ama-surfactants: Ama-surfactants angewona ama-ionic (isb, i-Tween 80) athuthukisa ukusungulwa kabusha kokwakheka kwe-HEC okufriziwe.