Popcorn-shaped polyethylene synthesised using highly active supported permethylindenyl metallocene catalyst systems

Area of Science:

• Organometallic Chemistry
• Polymer Science
• Catalysis

Background:

• Metallocene complexes are crucial catalysts in olefin polymerization.
• Unsymmetrical ligands can tune catalyst activity and polymer properties.
• Solid supports enhance catalyst handling and performance in industrial processes.

Purpose of the Study:

• To synthesize and characterize unsymmetrical permethylindenyl bent metallocene complexes.
• To immobilize these complexes onto inorganic solid supports for ethylene polymerization.
• To evaluate the catalytic activity and polymer morphology produced by the supported catalysts.

Main Methods:

• Synthesis of unsymmetrical permethylindenyl bent metallocene complexes.
• Immobilization of metallocene complexes onto solid polymethylaluminoxane supports.
• Slurry phase polymerization of ethylene using the supported catalysts.
• Analysis of polymer morphology, specifically aggregation characteristics.

Main Results:

• The synthesized metallocene complexes, when supported, demonstrated high activity in ethylene polymerization.
• The catalysts afforded polyethylene with a desirable low aggregation,
• popcorn
• morphology.
• The use of solid polymethylaluminoxane as a support was effective in creating highly active catalytic systems.

Conclusions:

• Unsymmetrical permethylindenyl bent metallocene complexes supported on polymethylaluminoxane are highly effective catalysts for ethylene polymerization.
• This catalytic system provides control over polymer morphology, yielding a low aggregation structure.
• The findings offer a pathway to tailor polymer properties through catalyst design and support interactions.