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Standard Test Method for Vinylidene Unsaturation in Polyethylene by Infrared Spectrophotometry
Přeložit název
NORMA vydána dne 1.11.2019
Označení normy: ASTM D3124-98(2019)
Datum vydání normy: 1.11.2019
Kód zboží: NS-975397
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
FTIR, infrared spectrophotometry, polyethylene, vinylidene unsaturation,, ICS Number Code 83.080.20 (Thermoplastic materials)
Significance and Use | ||||||||||||||||||
5.1 There are three types of olefinic groups present in sufficient concentrations to warrant consideration, one or more of which can normally be found in any polyethylene 5.2 The type and quantity of these groups can influence the chemical and physical properties of the resin. Information concerning their presence may also be used to characterize or identify unknown resins or blends of resins. 5.3 Vinylidene unsaturation represents the major portion of the unsaturation present in most low-density polyethylenes. 5.4 Infrared spectroscopy can be used for the determination of unsaturation in polyethylene (1, 3, 5). The values determined by infrared agree with those determined by IC1 uptake (5). |
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1. Scope | ||||||||||||||||||
1.1 This test method is applicable to all types of polyethylenes, those ethylene plastics consisting of ethylene and α-olefin copolymers longer than propylene, and blends of the above in any ratio. 1.2 The values stated in SI units are to be regarded as the standard. 1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 1: There is no known ISO equivalent to this standard. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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2. Referenced Documents | ||||||||||||||||||
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