Tandem Living Insertion and Controlled Radical Polymerization for Polyolefin-Polyvinyl Block Copolymers

Area of Science:

• Polymer Chemistry
• Materials Science

Background:

• Synthesizing polyolefin-polyvinyl block copolymers is challenging using traditional transition-metal catalysis.
• Existing methods often compromise the living nature of olefin polymerization for subsequent functionalization.

Purpose of the Study:

• To develop a new orthogonal radical/spin coupling technique for synthesizing polyolefin-polyvinyl block copolymers.
• To demonstrate the broad applicability and effectiveness of this novel polymerization strategy.

Main Methods:

• Utilized an orthogonal radical/spin coupling technique for tandem living insertion and controlled radical polymerization.
• Employed diverse radical/spin traps including TIPNO, TEMPO-Br, and PBN.
• Conducted subsequent controlled radical polymerization using nitroxide-mediated polymerization (NMP) and atom transfer radical polymerization (ATRP).

Main Results:

• Successfully synthesized polyolefin-polyvinyl di- and triblock copolymers with low dispersities (Đ < 1.3).
• Demonstrated broad tolerance of the coupling technique with various radical/spin traps.
• Achieved block copolymers incorporating acrylic, vinylic, and styrenic segments.

Conclusions:

• Radical trapping offers a versatile approach for polyolefin functionalization.
• This method expands the accessibility of polyolefin macroinitiators for advanced copolymer synthesis.
• The developed technique overcomes limitations in synthesizing complex block copolymers.