Study on propylene polymerization in the presence of phenolic antioxidant (Irganox 1076) and characterization of stabilized polymers

Abstract

The aim of this study was to investigate different concentrations of Irganox 1076 on Ziegler-Natta catalyst performance during propylene polymerization. Antioxidant masking was conducted by addition of different molar ratio of triethylaluminum (TEAL). Proton nuclear magnetic resonance and Fourier transform infrared spectroscopy spectra confirmed the complete conversion of antioxidant to aluminum aryloxide form. The different concentrations of masked antioxidant with different molar ratio of TEAL were used during polymerization and the catalyst activity was evaluated. Morphology, particle size distribution, melt temperature, crystallization temperature, degree of crystallinity, oxidative induction time, and isotacticity of products in the presence of masked antioxidant were evaluated. Results showed that incomplete masking of OH phenolic antioxidant led to significant catalyst activity reduction. J. VINYL ADDIT. TECHNOL., 21:285-289, 2015.

Effect of different additives and their mixtures on thermal stability of polyethylene synthesized using iron and titanocene hybrid catalysts

“…The catalyst activity showed an increment when the additives were added into the reactor, however, by increasing the additive content above 25 mg the catalyst activity decreased. In addition, it is usually observed that the direct addition of additive to the Ziegler–Natta system decreases the activity of catalyst . Shen et al .…”

“…The presence of additives can also disturb monomer recovery process. Because of these technical problems which are not favorable from an industrial point of view, in recent years, few investigations have been reported on the use of antioxidants in the polymerization of propylene, and their effect and chemical structures on the activity of catalyst and properties of the final products. Antioxidants are categorized into primary and secondary classes.…”