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 to 100 mg kg. 1.2 This test method is designed to determine the content of commercial product Dewaxol (trademark) and Inflow (trademark) 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 and Inflow in the concentration range of 1 to 35 %. 1.4 Units--The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.5 Any person sampling or handling this product should have consulted a Safety Data Sheet (SDS) for specific first aid instructions and information on the proper equipment to have available for use in the event of personal contact or exposure. 1.6 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 determine the applicability of regulatory limitations prior to use.


    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, and so forth) are widely used as inhibitors of thermopolymerization in the processes of transportation, storage, and separation of monomers (isoprene, butadiene, styrene, and so forth). 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.

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    Work Item Status

    Date Initiated:
    06-14-2019

    Technical Contact:
    Aleksey Yashin

    Item:
    001

    Ballot:
    D16.07 (19-03)

    Status:
    In Balloting

    Item:
    022

    Ballot:
    D16 (19-02)

    Status:
    Withdrawn From Balloting