ASTM-D6474 › Historical Revision Information
Standard Test Method for Determining Molecular Weight Distribution and Molecular Weight Averages of Polyolefins by High Temperature Gel Permeation Chromatography
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Scope
1.1 This test method covers the determination of molecular weight distributions and molecular weight averages of linear polyolefins by high temperature gel permeation chromatography (GPC). This test method uses commercially available polystyrene standards and equipment and is applicable to polyethylenes (excluding high pressure low density polyethylene–LDPE) and polypropylenes soluble in 1,2,4-trichlorobenzene (TCB) at 140°C. This test method is not absolute and requires calibration.
1.2 The values stated in SI units, based on IEEE/ASTM S1-10, are to be regarded as the standard.
1.3 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.
Significance and Use
5.1 This test method measures the molecular weight distribution and molecular weight averages of polyethylene (except LDPE) and polypropylene resins. Differences in molecular weight and molecular weight distribution significantly affect physical properties, such as morphology, strength, melt flow etc., and as a result, the final properties of products made from these resins.
Keywords
gel permeation chromatography; molecular weight average; molecular weight distribution; polyolefin; size exclusion chromatography
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83.080.20 (Thermoplastic materials)
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Document Number
ASTM-D6474-12
Revision Level
2012 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
Jan. 1, 2013
Document Type
Test Method
Page Count
6 pages
Committee Number
D20.70