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 polyo ls 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.... Read More

  • Average 30% Cost
    Savings

  • 100% Confidentiality
    Guarantee

  • Free, No-obligation
    Consultation

  • 100% Customer
    Satisfaction

    TRUSTED BY ENGINEERS FROM

    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.

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      ddd Just share your testing requirements and leave the rest on us!
      • Quick Turnaround and Hasslefree process
      • Confidentiality Guarantee
      • Free, No-obligation Consultation
      • 100% Customer Satisfaction