ASTM_D_1243_-_15.pdf

Designation:D124315Standard Test Method forDilute Solution Viscosity of Vinyl Chloride Polymers1This standard is issued under the fixed designation D1243;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.Scope*1.1 This test method covers the determination of the dilutesolution viscosity of vinyl chloride polymers in cyclo-hexanone.The viscosity is expressed in terms of inherentviscosity(logarithmic viscosity number).The test method islimited to those materials that give clear,uniform solutions atthe test dilution.NOTE1Other expressions for viscosity may be used as described inthe Appendix,but any change from the test method as specified shall bestated in the report.1.2 The values stated in SI units are to be regarded as thestandard.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.NOTE2This standard and ISO 1628-2 address the same subjectmatter,but differ in technical content.2.Referenced Documents2.1 ASTM Standards:2D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D446 Specifications and Operating Instructions for GlassCapillary Kinematic ViscometersD883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD1755 Specification for Poly(Vinyl Chloride)ResinsD2857 Practice for Dilute Solution Viscosity of PolymersE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision Liquids2.2 ISO Standard:ISO 1628-2 Determination of Viscosity Number and Limit-ing Viscosity NumberPart 2:Poly(Vinyl Chloride)Res-ins32.3 National Institute of Standards and Technology Circu-lar:4C-434 Testing of Glass Volumetric Apparatus3.Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology D883 and Terminology D1600,unless otherwise indi-cated.4.Summary of Test Method4.1 Asample of resin is dissolved in cyclohexanone to makea solution of specified concentration.Inherent viscosity(loga-rithmic viscosity number)is calculated from the measured flowtimes of the solvent and of the polymer solution.NOTE3For additional information,refer to Test Method D445 andTest Method D2857 for Dilute Solution Viscosity of Polymers.5.Significance and Use5.1 Dilute solution viscosity values for vinyl chloride poly-mers are related to the average molecular size of that portion ofthe polymer that dissolves in the solvent.6.Apparatus6.1 Transfer Pipets.6.2 Volumetric Flasks,100-mL,glass-stoppered,in accor-dance with National Institute of Standards and TechnologyCircular C-434.6.3 Viscometer,ASTM Ubbelohde Size 1 or Cannon-Ubbelohde No.75.NOTE4Operating instructions can be found in Specification D446.6.4 Water Bath,set at 30.0 6 0.5C,controlled to within 60.01C.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materi-als.15.07).Current edition approved Oct.1,2015.Published October 2015.Originallyapproved in 1952.Last previous edition approved in 2014 as D1243-14.DOI:10.1520/D1243-15.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.*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 6.4.1 The temperature of the bath medium shall not vary bymore than 60.02C of the selected temperature in accordancewith Test Method D445.6.5 Timer,as specified in Test Method D445,graduated indivisions of 0.1 s or less.6.6 Filter Funnel,funnel,Hirsh-Type;borosilicate glass;w/coarse fritted disc,pore size:4060 m.6.7 Thermometer,standard,in accordance with MethodE2251.7.Materials7.1 SolventCyclohexanone,analytical reagent grade orlaboratory-distilled technical grade,boiling between 155 and156C at 760 mm Hg has been found acceptable if stored in aclosed container.8.Procedure8.1 Dissolve duplicates of resin as follows:Weigh 0.2 60.002 g of the sample(moisture content below 0.1%)andtransfer it to a 100-mL glass-stoppered volumetric flask.Takecare to transfer all of the weighed resin into the flask.As analternative method,w