2010复杂流体流变学研讨会资料 童真 用LAOS方法研究锂藻土-PEO的非线性粘弹性

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1、用LAOS方法研究锂藻土-PEO的非线性粘弹性Contents1.Laponite-PEG2.RheologyunderLAOS童真3.Laponite-PEGunderLAOS华南理工大学材料科学与工程学院广州市，510640121.Laponite-PEGLaponite-PEGLaponite•Laponite+NIPAm→insitupolymerizationasynthetichectorite,[Mg5.34Li0.66Si8O20(OH)4]Na0.66Layersize:30nmindiameter&1nminthi

2、cknessHaraguchiK.etal.,Macromoleculeschargeddisc2005,38(8),3482-3490Hectorite•Laponite+PEG→adsorptionzeta-potential:-55.2mVsuspensioninwaterHouseofCards3Baghdadi,H.A.etal.J.Polym.Sci.B2005,43:233-2404HaraguchiK.etal.,Macromolecules2005,38(8),3482-3490Mechanicalpropertie

3、sofPNIPAm/PEG/LaponiteLaponiteXLG(2w/v%)+PEG(10k)+NIPAm(10NCgelsw/v%)→insitupolymerization•Equilibriummodulus40Ge=NRT(γ=0.5%)APEG/Laponite<0.3PEG/Laponite=0.530Laponite2w/v%•TensilestressMPEG=10000Cτ=N*RT[α-(1/α)2](α=2)20G20.70.7A10Strength/kPa0.60.6NIPAm10w/v%N*G2-10-1

4、0K-3/3000B0.50.5molmG2-50-10KBLaponite2w/v%AG2-20-10K/molm0.40.4M=10000as-preparedN-32500PEGG2-50-10Ktranslucent0.30.3Laponite2w/v%flowat25oCPEG10K20000.20.2Elongation/%PEGadsorptionobstructstheanchoringof0.00.10.20.30.4C/w/v%propagatingPNIPAmchainsonLaponitePEG1500PEGa

5、dsorption0.00.10.20.30.40.50.65C/w/v%6Hu,X.etal.Langmuir2010,26:4233-4238reduceschaindensityPEG12.RheologyunderLAOSpoly(ethyleneglycolmethylethermethacrylate)(PEGMA)replacesPEG•DependenceofG*onstrainamplitudeγ0adsorptionandcopolymerization•Linearviscoelasticity:storagem

6、odulusG’andlossmodulusG”;indistinguishabledifferentfluids60Laponite2w/v%50•Nonlinearviscoelasticity:largeamplitudePEGMA2K40oscillatorystrain(LAOS)rheology;large30Strength/kPa20PEG2Kadditionaljunctiondeformation2400effectofadsorbed•Microstructureofsomefluidsbarelychanges

7、2200withsmalldeformationbutchangessignificantlyPEGMA2000PEG2K1800underlargedeformations1600•Onlybynon-linearexperimentscanthisElongation/%1400PEGMA2K1200particularbehaviorbeobserved0.00.10.20.30.4C/w/v%78PEGLAOSbehavior-4typesoffluidsNonsinusoidalstressresponsestrainstr

8、ainshinninghardeningSinusoidalstraininputγ(t)=sinωtNonsinusoidalstressresponse∞σ()t=∑σsin(nωt+δ)nnn=1σ1σn(ω,γ0