ASTM D5576-00(2013)

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

standard by ASTM International , 04/01/2013

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Full Description

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 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-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 2-There is no known ISO equivalent to this standard.

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Published:: 04/01/2013
Number of Pages:: 3
File Size:: 1 file , 72 KB
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