ASTM WK68689

    New Test Method for Determination of the Content of Nitroxide Radical (4-Hydroxy-2,2,6,6-tetramethylpiperidine-l-oxyl) in Butadiene, Styrene and Isoprene (and in commercial products Dewaxol, Inflow) by Cyclic Voltammetry Method

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    Developed by Subcommittee: D16.07 | Committee D16 | Contact Staff Manager



    WK68689

    1. Scope

    1.1 This test method is designed to determine the content of nitroxide radical 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl in butadiene, isoprene and styrene in the concentration range of 1 mg kg to 100 mg kg. 1.2 This test method is designed to determine the content of commercial product Dewaxol, Inflow in butadiene, isoprene and styrene in the concentration range of 0.0002% to 0.02%. 1.3 This test method is designed to determine the content of nitroxide radical 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl in commercial products Dewaxol, Inflow in the concentration range of 1% to 35%.


    Keywords

    nitroxide radical; 4-hydroxy-2,2,6,6-tetramethylpiperidine-l-oxyl; TEMPO, butadiene; styrene; isoprene; dewaxol; inflow; cyclic voltammetry method

    Rationale

    Nitroxide radicals (H-Tempo, O-Tempo, etc.) are widely used as inhibitors of thermopolymerization in the processes of transportation, storage and separation of monomers (isoprene, butadiene, styrene, etc.). This test method provides procedure for assaying nitroxide radicals in of monomers.

    The title and scope are in draft form and are under development within this ASTM Committee.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    06-14-2019

    Technical Contact:
    Aleksey Yashin

    Item:
    001

    Ballot:
    D16.07 (19-02)

    Status:
    In Balloting