羟乙基纤维素水溶液流变性能研究的中期报告.docx

羟乙基纤维素水溶液流变性能研究的中期报告

Abstract

Therheologicalpropertiesofhydroxyethylcellulose(HEC)solutionshavebeenstudiedinthisreport.Theeffectsofconcentration,temperature,andshearrateontheviscosityandviscoelasticityofHECsolutionswereinvestigatedusingarotationalrheometer.TheresultsshowedthattheviscosityofHECsolutionsincreaseswithincreasingconcentrationanddecreaseswithincreasingtemperature.TheviscoelasticityofHECsolutionswasfoundtobepredominantlyelasticatlowfrequencies,butpredominantlyviscousathighfrequencies.ThedynamicmoduliofHECsolutionsincreasedwithincreasingconcentrationanddecreasedwithincreasingtemperature.TheresultsofthisstudycanprovideimportantinformationfortheindustrialapplicationofHECsolutions.

Introduction

Hydroxyethylcellulose(HEC)isanonionicwater-solublepolymerwidelyusedinvariousfields,suchascosmetics,pharmaceuticals,andfoodindustries,duetoitsexcellentviscosity-building,thickening,andstabilizingproperties.TherheologicalpropertiesofHECsolutionsareimportantforitsindustrialapplication.Inthisstudy,weinvestigatedtheeffectsofconcentration,temperature,andshearrateontheviscosityandviscoelasticityofHECsolutions.

Experimental

Materialsandinstruments

Hydroxyethylcellulose(HEC,degreeofsubstitutionDS=2.0,viscositygrade3000mPa·s)waspurchasedfromSigma–Aldrich.Distilledwaterwasusedasthesolvent.Arotationalrheometer(MCR301,AntonPaarGmbH)equippedwithacone-and-plategeometry(diameter=50mm,angle=1.0°)wasemployedfortherheologicalmeasurements.

PreparationofHECsolutions

HECsolutionswithconcentrationsrangingfrom0.1to1.0wt%werepreparedbydissolvingHECindistilledwaterunderconstantstirringatroomtemperaturefor24h.Thesolutionswereallowedtostandforanother24hbeforetherheologicalmeasurements.

Rheologicalmeasurements

TheviscosityandviscoelasticityofHE