1、Designation:D383508Standard Test Method forDetermination of Properties of Polymeric Materials byMeans of a Capillary Rheometer1This standard is issued under the fixed designation D3835;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,
2、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.Scope*1.1 This test method covers measurement of the rheologicalproperties of polymeric materials at various temperature
3、s andshear rates common to processing equipment.It covers mea-surement of melt viscosity,sensitivity,or stability of meltviscosity with respect to temperature and polymer dwell timein the rheometer,die swell ratio(polymer memory),and shearsensitivity when extruding under constant rate or stress.Thet
4、echniques described permit the characterization of materialsthat exhibit both stable and unstable melt viscosity properties.1.2 This test method has been found useful for qualitycontroltestsonbothreinforcedandunreinforcedthermoplastics,cure cycles of thermosetting materials,andother polymeric materi
5、als having a wide range of melt viscosi-ties.1.3 The values stated in SI units are to be regarded asstandard.The inch-pound units given in parentheses are forinformation only.NOTE1Although this test method and ISO 114431995,“PlasticDetermination of the Fluidity of Plastics Using Capillary and Slit-D
6、ieRheometers”differ in approach or detail,the data obtained using ISO11443,Method A is technically equivalent to this test method1.4 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 ap
7、pro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1238 Test Method for Melt Flow Rates of Thermoplasticsby E
8、xtrusion PlastometerE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ANSI Standard:B46.1 Surface Texture33.Terminology3.1 For definitions of general terms,see Terminology D883.3.2 Definitions of Terms Specific to This Standard:3.2.1 apparent valuesv
9、iscosity,shear rate,and shear stressvalues calculated assuming Newtonian behavior and that allpressure drops occur within the capillary.3.2.2 critical shear ratethe shear rate corresponding to thecritical shear stress(1/s).3.2.3 critical shear stressthe value of the shear stress atwhich there is a d
10、iscontinuity in the slope of log shear stressversus log shear rate plot or periodic roughness of the polymerstrand occurs as it exits the rheometer die(MPa).3.2.4 delay timethe time delay between piston stop andstart when multiple data points are acquired from a singlecharge(s).3.2.5 melt densitythe
11、 density of the material in the moltenform expressed in g/mL.3.2.6 melt timethe time interval between the completionof polymer charge and beginning of piston travel(s).3.2.7 percent extrudate swellthe percentage change in theextrudate diameter relative to the die diameter.3.2.8 shear raterate of she
12、ar strain or velocity gradient inthe melt,usually expressed as reciprocal time such as second1(s1).3.2.9 shear stressforce per area,usually expressed inpascals(Pa).3.2.10 swell ratiothe ratio of the diameter of the extrudedstrand to the diameter of the capillary(die).1This test method is under the j
13、urisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on Thermal Properties.Current edition approved Dec.1,2008.Published December 2008.Originallyapproved in 1979.Last previous edition approved in 2002 as D3835 02.DOI:10.1520/D3835-08.2For referenced AS
14、TM 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,
15、New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.11 viscosityratio of shear stress to shear rate at a givenshear rate or shear stress
16、.It is usually expressed in pascalseconds(Pas).3.2.11.1 Viscosity determined on molten polymers is some-times referred to as melt viscosity.3.2.11.2 Viscosity determined on materials exhibiting non-Newtonian flow behavior is referred to as apparent viscosityunless corrections are made as specified in Section 11.3.2.12 zero shear viscosity,0the limiting viscosity as theshear rate falls to zero.4.Significance and Use4.1 This test method is sensitive to polymer molecularweight and molecular weight