Propylene Polymerization Catalyzed by Metallocene /Methylaluminoxane Systems on Rice Husk Ash.

摘要: Silica generated from agricultural waste is more cost effective and environmentally friendly than silica traditional commercial processes. In this study, spherical particles with a diameter of around 120 nm were fabricated rice husk ash (RHA), used to support two bridged zirconcene complexes ((I) Me2Si(Ind)2ZrCl2 (II) C2H4(Ind)2ZrCl2) for catalyzing propylene polymerization produce polypropylene (PP) in temperature range 40–70 °C solution methylaluminoxane (MAO) 0.1–0.6 wt%. Due its small particle size, RHA-supported catalyst exhibited much higher activity micro-sized silica-supported catalyst. At the optimum 55 increasing MAO concentration, polymer yield increased proportionally increase number average molecular weight. Compared (I), produced molecules but shorter chain length, ascribed differences Zr loading bridge structure. With temperature, weight decreased rapidly resulted significant change PP assembly morphology (shape size). °C, (I) uniform assemblies which had dumbbell-like structure smooth middle section fibrillar ends, while particles. The dumbbell part width was essentially identical Batchelor microscale proposed turbulent mixing theory.