Fully tuneable ethylene-propylene elastomers using a supported permethylindenyl-phenoxy (PHENI*) catalyst.

Area of Science:

• Polymer Chemistry
• Catalysis Science

Background:

• Ethylene-propylene elastomers (EPM) and ethylene-propylene-diene elastomers (EPDM) are versatile materials with tunable properties.
• Developing efficient catalysts for controlled elastomer synthesis is crucial for material innovation.

Purpose of the Study:

• To synthesize high molecular weight EPM and EPDM using a highly active supported permethylindenyl-phenoxy (PHENI*) titanium catalyst.
• To investigate the catalyst's ability to control copolymer composition and enable post-polymerization modification.

Main Methods:

• Slurry-phase catalysis utilizing a supported permethylindenyl-phenoxy (PHENI*) titanium catalyst.
• Monomer feed ratio adjustment to influence copolymer composition.
• Model sulfur vulcanization for post-polymerization crosslinking of EPDM.

Main Results:

• High molecular weight EPM and EPDM were successfully prepared.
• A linear relationship was observed between the monomer feed ratio and the final copolymer composition.
• Post-polymerization crosslinking of EPDM was demonstrated.

Conclusions:

• The PHENI* titanium catalyst offers a single-catalyst solution for producing a continuum of EPM and EPDM properties.
• This catalyst provides precise control over elastomer composition, facilitating tailored material design.
• The catalyst system is amenable to further modification, including post-polymerization crosslinking.