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ASTM D7977-14

(Test Method)

Standard Test Methods for Polymer Content of AMS (α-Methylstyrene)

Standard Test Methods for Polymer Content of AMS (α-Methylstyrene)

SIGNIFICANCE AND USE
4.1 This test method can be used for determining polymer concentrations in AMS monomer.  
4.2 This test method will not detect dimers and trimers.  
4.3 This test method can be used for plant control and for specification analysis.
SCOPE
1.1 This test method covers the determination of the polymer content of AMS (α-Methystyrene). Dimers and trimers are not measured by these test methods.  
1.2 This test method has been found applicable to determining the polymer content of AMS in concentrations up to 15 mg/kg. Samples containing more than 15 mg/kg of polymer must be suitably diluted before measurement.  
1.3 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 8.

General Information

Status
Historical
Publication Date
30-Nov-2014
ICS
71.080.15 - Aromatic hydrocarbons
Technical Committee
D16 - Aromatic, Industrial, Specialty and Related Chemicals
Drafting Committee
D16.07 - Styrene, Ethylbenzene and C9 and C10 Aromatic Hydrocarbons
Current Stage
Ref Project

Relations

Referred By
ASTM D6367-21 - Standard Specification for AMS (α-Methylstyrene)
Effective Date
01-Dec-2014

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ASTM D7977-14 - Standard Test Methods for Polymer Content of AMS (α-Methylstyrene)ASTM D7977-14 - Standard Test Methods for Polymer Content of AMS (α-Methylstyrene)
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ASTM D7977-14 - Standard Test Methods for Polymer Content of AMS (α-Methylstyrene)
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7977 − 14
Standard Test Methods for
1
Polymer Content of AMS (α-Methylstyrene)
This standard is issued under the fixed designation D7977; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
3
1. Scope 2.2 Other Document:
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
1.1 This test method covers the determination of the poly-
1910.1200
mer content ofAMS (α-Methystyrene). Dimers and trimers are
not measured by these test methods.
TEST METHOD A—DETERMINATION OF POLYMER
1.2 This test method has been found applicable to determin- IN α-METHYLSTYRENE VIA
ing the polymer content of AMS in concentrations up to 15 SPECTROPHOTOMETER
mg/kg. Samples containing more than 15 mg/kg of polymer
must be suitably diluted before measurement. 3. Summary of Test Method
1.3 In determining the conformance of the test results using 3.1 This test method utilizes the fact that AMS polymers
this method to applicable specifications, results shall be present in the monomers are insoluble in methanol. The
rounded off in accordance with the rounding-off method of polymer content ofAMS monomer is determined by measure-
Practice E29. ment of the degree of turbidity produced by the addition of dry
methanol to the AMS sample.
1.4 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4. Significance and Use
standard.
4.1 This test method can be used for determining polymer
1.5 This standard does not purport to address all of the
concentrations in AMS monomer.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.2 This test method will not detect dimers and trimers.
priate safety and health practices and determine the applica-
4.3 This test method can be used for plant control and for
bility of regulatory limitations prior to use. For specific hazard
specification analysis.
statements, see Section 8.
5. Interferences
2. Referenced Documents
5.1 Small changes in turbidity may occur with time. It is,
2
2.1 ASTM Standards:
therefore,importantthattheabsorbanceofcalibrationmixtures
D3437 Practice for Sampling and Handling Liquid Cyclic
and samples be determined after standing the same length of
Products
time.
D6367 Specification for AMS (α-Methylstyrene)
5.2 Hexane is used for two reasons:
D6809 Guide for Quality Control and Quality Assurance
5.2.1 To block out any color in the AMS, and
Procedures for Aromatic Hydrocarbons and Related Ma-
5.2.2 To indicate high levels of dissolved water in theAMS.
terials
E29 Practice for Using Significant Digits in Test Data to
5.3 Water content was found to have a slight impact on the
Determine Conformance with Specifications
measurement of polymer in AMS solution. When the water
concentration is below 260 ppm, its effect on the measurement
of polymer in AMS solution is negligible.
1
These test methods are under the jurisdiction of ASTM Committee D16 on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
6. Apparatus
Subcommittee D16.07 on Styrene, Ethylbenzene and C9 and C10 Aromatic
6.1 Class A Volumetric Pipets, 10 and 15-mL.
Hydrocarbons.
Current edition approved Dec. 1, 2014. Published March 2015. DOI: 10.1520/
D7977-14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
Standards volume information, refer to the standard’s Document Summary page on 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
the ASTM website. www.access.gpo.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7977 − 14
6.2 Bottles or Flasks, of suitable size equipped with glass 10.2.2 Makestandardsolutionscontaining1,3,6,9,12,and
stoppers. 15 mg/kg of polymer by diluting 1, 3, 6, 9, 12, and 15 mL of
the 100 mg/kg standard solution to 100 mL with AMS in a
6.3 Spectrophotometer or Photometer Cells, with 100 to
volumetric flask at 25°C.
150-mm light path.
10.3 Calibration Curves and Tables:
6.4 Spectrophotometer of Photometer, capable of absor-
10.3.1 Into each of a series of 25 mL volumetric flasks
bance measurements in wavelength region of 330 nm and
equipped with glass stoppers pipet 15 mLof dry methanol and
sensitive to 1 mg polymer/kg monomer.
10 mLof a polymer standard and mix thoroughly. Into another
series of flasks pipet 15 mL of hexane and 10 mL of ea
...

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