Harnessing the β-Silicon Effect for Radical Cyclopolymerization: Direct Access to Si-Containing Cyclic Olefin...

Area of Science:

• Polymer Chemistry
• Materials Science
• Organic Chemistry

Background:

• Cyclic olefin polymers (COPs) are established functional materials.
• Silicon-containing cyclic olefin polymers (Si-COPs) are underexplored alternatives.
• Radical cyclopolymerization of non-conjugated dienes is challenging due to chain transfer.

Purpose of the Study:

• To develop an efficient synthesis for Si-COPs.
• To control cyclization selectivity in radical polymerization.
• To explore the properties and applications of novel Si-COPs.

Main Methods:

• Radical cyclopolymerization strategy utilizing the β-silicon effect.
• Density Functional Theory (DFT) calculations for mechanistic insights.
• Thiol-ene chemistry for fabricating cross-linked Si-COPs.

Main Results:

• Efficient synthesis of Si-COPs was achieved by suppressing chain transfer via the β-silicon effect.
• Controlled cyclization selectivity was demonstrated.
• Si-COPs showed potential for post-polymerization modification and controlled degradation.
• Cross-linked Si-COPs exhibited optical properties and adhesion comparable to commercial COPs.

Conclusions:

• The β-silicon effect is a powerful tool for synthesizing Si-COPs.
• Si-COPs offer a promising platform for advanced material development.
• These novel polymers possess desirable optical and adhesive properties for potential applications.