ASTM D5576-00(2013)
Standard Practice for Determination of Structural Features in Polyolefins and Polyolefin Copolymers by Infrared Spectrophotometry (FT-IR)

Standard No.
ASTM D5576-00(2013)
Release Date
2000
Published By
American Society for Testing and Materials (ASTM)
Status
Replace By
ASTM D5576-00(2021)e1
Latest
ASTM D5576-00(2021)e1
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 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