ASTM-D5576 › Historical Revision Information
Standard Practice for Determination of Structural Features in Polyolefins and Polyolefin Copolymers by Infrared Spectrophotometry (FT-IR)
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This practice covers infrared spectrophotometry procedures for determining the molecular structural features such as types and number of branches in polyolefins and polyolefin copolymers. The structural features expressed by these determinations affect the ultimate polymeric properties and are useful in showing correlations with many performance properties. The apparatus is comprised of double beam or Fourier transform infrared spectrophotometer, hot plate, microscope slides, compression molding press, metal plates, brass shims, micrometer, and film mounts. Materials shall include polyethylene terephthalate, aluminum, or matte finished teflon-fiberglass sheet. The concentration shall be calculated using either the Beer-Lambert law with the appropriate molar absorptivity or an appropriate calibration curve.
Scope
1.1 This practice covers infrared procedures for determining the molecular structural features in polyolefins and polyolefin copolymers. The structural features of primary concern are the types and numbers of branches. Although this practice centers its attention on polyolefins and polyolefin copolymers, the techniques, with proper modification, can be used for some other polymers as well.
Structure | Absorption Band, cm–1 | ASTM Test Method |
Methyl group (polyethylene) | 1378 | D2238 |
Methyl group (eth-prop copol) | 1380 |
|
Pendant methyl | 935 |
|
Terminal vinyl | 908 | D6248 |
Trans-vinylene | 965 | D6248 |
Vinylidene | 888 | D3124 |
Structure | Absorption Band, cm–1 | ASTM Test Method |
Vinyl acetate | 609 | D5594 |
| 1020 | D5594 |
| 3270 | D5594 |
Styrene | 770–700 |
|
| 1600–1500 |
|
Ethyl acrylate | 1640–1730 |
|
| 862 | D3594 |
Ethylene acrylate | 1280–1200 |
|
| 1640–1625 |
|
1.2 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 to determine the applicability of the regulatory limitations prior to use.
Keywords
copolymers; FT-IR; infrared spectrophotometry; polyethylene; structural features
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To find similar documents by classification:
83.080.20 (Thermoplastic materials)
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Document Number
ASTM-D5576-00(2013)
Revision Level
2000 R13 EDITION
Status
Superseded
Modification Type
Reapproval
Publication Date
April 1, 2013
Document Type
Practice
Page Count
3 pages
Committee Number
D20.70