This method is for the determination of Irganox 1010 and chemically identical antioxidants in polypropylene where the additive package is known. The method utilizes a characteristic ester carbonyl band associated with the additive that is common in many other additives. Therefore, the total additive package must be known to confirm that other additives present do not contain bands that would interfere with the measurement. The method is typically used for process control of additive addition and is not recommended for filled or pigmented resins. The sample must be pressed into a film or coupon prior to the analysis.
Data is obtained using an Agilent Cary 630 FTIR spectrometer equipped with a DialPath or TumblIR sample interface with a 1000 μm path length. Equivalent FTIR spectrometers, such as the mobile or portable Agilent 5500/4500 Series FTIR, can also be used.
The MicroLab PC software method, Polymer — Irganox 1010 in Polypropylene v1, includes the calibration data. This calibrated method is available with the Agilent 5500 and 4500 Series DialPath or TumblIR FTIR spectrometers, as well as the Cary 630 FTIR spectrometers. This method and software performs all the calculations automatically and reports the final value as wt% Irganox 1010 in PP.