ASTM D5576 - 00(2013)

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

    Active Standard ASTM D5576 | Developed by Subcommittee: D20.70

    Book of Standards Volume: 08.03


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    ASTM D5576

    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.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. 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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D883 Terminology Relating to Plastics

    D1505 Test Method for Density of Plastics by the Density-Gradient Technique

    D1600 Terminology for Abbreviated Terms Relating to Plastics

    D2238 Test Methods for Absorbance of Polyethylene Due to Methyl Groups at 1378 cm-1

    D3124 Test Method for Vinylidene Unsaturation in Polyethylene by Infrared Spectrophotometry

    D3594 Test Method for Copolymerized Ethyl Acrylate In Ethylene-Ethyl Acrylate Copolymers

    D5594 Test Method for Determination of the Vinyl Acetate Content of Ethylene-Vinyl Acetate (EVA) Copolymers by Fourier Transform Infrared Spectroscopy (FT-IR)

    D6248 Test Method for Vinyl and Trans Unsaturation in Polyethylene by Infrared Spectrophotometry

    E131 Terminology Relating to Molecular Spectroscopy

    E168 Practices for General Techniques of Infrared Quantitative Analysis

    E932 Practice for Describing and Measuring Performance of Dispersive Infrared Spectrometers

    E1421 Practice for Describing and Measuring Performance of Fourier Transform Mid-Infrared (FT-MIR) Spectrometers: Level Zero and Level One Tests

    IEEE/ASTM SI-10 Standard for Use of the International System of Units (SI): The Modern System


    ICS Code

    ICS Number Code 83.080.20 (Thermoplastic materials)

    UNSPSC Code

    UNSPSC Code 13102032(Thermoplastic polyolefin TPO)


    DOI: 10.1520/D5576-00R13

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