Effect of Manganese Stearate on Stabilization Efficiency of a Phenolic Antioxidant During Thermal-Oxidation of Polypropylene

Document Type : Research Article

Authors

Department of Polymer Engineering, Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN

Abstract

This study aimed to achieve a formulation for an additive to produce oxo-biodegradable polypropylene films that accelerates oxidative degradation of the films after preservation of properties over a span of desired service life, so that, it can be used by microorganisms as a food source. Thermal oxidation behavior of thin polypropylene films (250 ± 50 μm thick) containing various weight ratios of manganese stearate as pro-oxidant to a commercially used phenolic antioxidant (Songnox 1010) has been studied in both melt and solid states. Thermo-oxidative stability in melt state was studied using differential scanning calorimetry (DSC). The rate of thermal oxidation in solid-state was investigated via oven aging experiments at 90 °C followed by measuring changes in carbonyl index, tensile properties, melt flow index, and density. It was shown that the efficiency of the phenolic antioxidant in thermo-oxidative stabilization of the polymer in both melt and solid states can be changed by altering the weight ratio of manganese stearate to the antioxidant. On the basis of the obtained results, it was concluded that a sample containing 0.1 wt% of the pro-oxidant and 0.35 wt% of the antioxidant is suitable for attaining desired stability in both melt and solid states and also can undergo rapid thermal oxidation after a certain period of being stable in the solid-state. Thus, it was concluded that the mentioned formulation can be applied for designing an oxo-biodegradable product, which, in addition to having the desired stability in melt processing as well as during its final usage as a film, experiences fast thermal oxidation and becomes prepared for the eventual biodegradation.

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References

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