ASTM_D_7605_-_11.pdf

Designation:D760511Standard Test Method forThermoplastic ElastomersMeasurement of Polymer MeltRheological Properties and Congealed Dynamic PropertiesUsing Rotorless Shear Rheometers1This standard is issued under the fixed designation D7605;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the use of a rotorless oscillatingshear rheometer for the measurement of the flow properties ofpolymer melts and their respective congealed dynamic prop-erties for thermoplastic elastomers(TPE)which includesthermoplastic vulcanizates(TPV).These flow properties andcongealed dynamic properties are related to factory processingand product performance.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1349 Practice for RubberStandard Conditions for Test-ingD3896 Practice for Rubber From Synthetic SourcesSamplingD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesD6600 Practice for Evaluating Test Sensitivity for RubberTest Methods3.Terminology3.1 Definitions:3.1.1 complex shear modulus,G*,nratio of peak ampli-tudeshearstresstopeakamplitudeshearstrain;mathematically,G*=(S*/Area)/Strain=(G2+G”2)1/2.3.1.2 complex torque,S*,npeak amplitude torque re-sponse measured by a reaction torque transducer for a sinusoi-dally applied strain;mathematically,S*is computed by S*=(S2+S”2)1/2.3.1.3 congealed thermoplastic,nthermoplastic polymerthat when cooled from the melt state exhibits a substantialportion of the physical properties of the solid state.3.1.4 dynamic complex viscosity,*,nratio of the com-plex shear modulus,G*to the oscillation frequency,inradians per second.3.1.5 elastic torque,S,npeak amplitude torque compo-nent which is in phase with a sinusoidally applied strain.3.1.6 loss angle,nphase angle by which the complextorque(S*)leads a sinusoidally applied strain.3.1.7 loss factor,tan,nratio of loss modulus to storagemodulus,or the ratio of viscous torque to elastic torque;mathematically,tan =G”/G=S”/S.3.1.8 loss shear modulus,G”,nratio of(viscous)peakamplitude shear stress to peak amplitude shear strain for thetorque component 90 out of phase with a sinusoidally appliedstrain;mathematically,G”=(S”/Area)/Peak Strain.3.1.9 real dynamic viscosity,nratio of the loss shearmodulus,G”to the oscillation frequency,in radians persecond.3.1.10 storage shear modulus,G,nratio of(elastic)peakamplitude shear stress to peak amplitude shear strain for thetorque component in phase with a sinusoidally applied strain;mathematically,G=(S/Area)/Peak Strain.3.1.11 viscous torque,S”,npeak amplitude torque com-ponent which is 90 out of phase with a sinusoidally appliedstrain.4.Summary of Test Method4.1 A thermoplastic elastomer test specimen is contained ina sealed die cavity which is closed and maintained at anelevated temperature.The cavity is formed by two dies,one of1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.12 on Processability Tests.Current edition approved Nov.1,2011.Published November 2011.Last previousedition approved in 2010 as D7605 10.DOI:10.1520/D7605-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 which is oscillated through a rotary amplitude.This actionproduces a sinusoidal torsional strain in the test specimenresulting in a sinusoidal torque,which measures a viscoelasticquality of the test specimen.The test specimen can be athermoplastic elastomer such as a thermoplastic vulcanizate(TPV),a styrenic blocked copolymer(SBC),a copolyester,athermoplastic polyurethane,a thermoplastic polyolefin,orother TPE forms.4.2 These viscoelastic measurements can be made based on(1),a frequency sweep in which the frequency is programmedto change in steps under constant strain amplitude and tem-perature conditions,(2),a strain sweep in which the strainamplitude is programmed to change in steps under constantfrequency and temperature conditions,or(3),a temperaturesweep in which the temperature is programmed to eitherincrease or decrease under constant str