ASTM D4273 Determination of Primary Hydroxyl Content of Polyether Polyols

ASTM D4273 Determination of Primary Hydroxyl Content of Polyether Polyols

ASTM D4273 is used to determine the primary hydroxyl content of ethylene oxide (EO)-propylene oxide (PO) polyether polyols used to form flexible polyurethane foams. This method is highly efficient for polyether polyols with primary hydroxyl contents of 10 to 90%. The values are considered as a standard when expressed in SI units.

    Scope:

    ASTM D4273 delivers information about the relative reactivities of polyols. It also provides a good balance between hydrophobicity and reactivity. Sometimes, poor reactivity ethylene oxide is added to the tail of the polyether polyols.

    Procedure:

    For ASTM D4273, a solution of the polyol sample in deuterated acetone having tetramethyl silane (TMS) as an internal standard is prepared. Then transfer a suitable amount of the sample solution to an NMR tube. The NMR tube is then placed in a spinner and the optimized field-homogeneity is acquired from the NMR data. Apply a spectral weighting function (apodization) to the Free Induction Decay and Fourier Transform (FID). Internal TMS reference is set to around 0 ppm. The primary hydroxyl peaks usually resonate between 61.0 and 62.5 ppm, while the secondary hydroxyl peaks generally resonate between 65.5 and 67.5 ppm.

    Specimen size:

    The suggested broadening line value is 1 per acquisition time.

    Data:

    The following equation is used in ASTM D4273 to calculate the primary hydroxyl content of polyether polyols

    Primary hydroxyl, % 5 = A* 100/A+B

    A= primary hydroxyl peak

    B= secondary hydroxyl peak

    Conclusion:

    ASTM D4273 delivers information about the relative reactivities of polyols.

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