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.
Область применения1.1 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 1—Quantitative 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-IRStructure
Absorption Band, cm–1
ASTM Test Method
Methyl group (polyethylene)
1378
Methyl group (eth-prop copol)
1380
Pendant methyl
935
Terminal vinyl
908
Trans-vinylene
965
Vinylidene
888
Structure
Absorption Band, cm–1
ASTM Test Method
Vinyl acetate
609
1020
3270
Styrene
770–700
1600–1500
Ethyl acrylate
1640–1730
862
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 2—There is no known ISO equivalent to this standard.