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ASTM D5576-00(2013)

ASTM D5576-00(2013)

Standard Practice for Determination of Structural Features in Polyolefins and Polyolefin Copolymers by Infrared Spectrophotometry (FT-IR)

Fecha:
2021-02-02 /Historical
Superseeded by:
Abstract:

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.

Note 1Quantitative determinations require either an internal or an external evaluation of sample thickness. ASTM test methods available for specific features are listed in Tables 1 and 2.
TABLE 1 Polyolefin Structural Features Determined by FT-IR

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


TABLE 2 Structural Features in Polyolefin Copolymer Determined by FT-IR

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.

Note 2There is no known ISO equivalent to this standard.
Keywords:
copolymers; FT-IR; infrared spectrophotometry; polyethylene; structural features
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