Linear Low-Density Polyethylene (LLDPE) Composition ASTM D5017-17

Linear Low-Density Polyethylene (LLDPE) Composition ASTM D5017-17

This ASTM D5017-17 test method covers the use of Carbon-13 nuclear magnetic resonance to determine the composition of linear low-density polyethylene (LLDPE). For ethylene copolymers with propylene, butene-1, hexene-1, octene-1, and 4-methyl pentene-1, this test method allows quantification of these branches.

    Scope:

    The molar composition of copolymers made from ethylene (ethene) and a second alkene-1  monomer is determined using the ASTM D5017-17 test technique. Propene, butene-1, hexene-1,  octene-1, and 4-methyl pentene-1 are examples of the second monomer. This test method’s calculations are valid for products with the units EEXEE, EXEXE, EXXE, EXXXE, and, of course, EEE, where E is ethene and X is alkene-1. 

    Procedure:

    Polymer samples are dispersed in the hot solvent and examined using Carbon-13 nuclear magnetic resonance (NMR) spectroscopy at high temperatures per ASTM D5017-17. Spectra are captured in such a way that each chemically distinct carbon’s response is similar. The copolymer composition is calculated using integrated responses for carbons originating from distinct comonomers.

    Specimen size:

    In ASTM D5017 test procedure, a homogeneous sample of polymer of 1.2 gram is used. 

    Data:

    The ASTM D5017 test method results can be converted from mole percent alkene-1 to branches per 1000 carbons (BR/1000C).

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