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Universal (switchable) RAFT agents.

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  • 1CSIRO Molecular and Health Technologies, Bag 10, Clayton South, Victoria 3169, Australia.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Reversible addition-fragmentation chain transfer (RAFT) is a controlled radical polymerization technique.
  • Selecting appropriate RAFT agents for specific monomers (more-activated vs. less-activated) is crucial for successful polymerization control.
  • Existing RAFT agents often show selectivity, inhibiting or poorly controlling certain monomer types.

Purpose of the Study:

  • To introduce a novel class of "switchable" RAFT agents.
  • To demonstrate their effectiveness in controlling polymerization of both less-activated monomers (LAMs) and more-activated monomers (MAMs).
  • To enable the synthesis of block copolymers with controlled molecular weights.

Main Methods:

  • Synthesis of N-(4-pyridinyl)-N-methyldithiocarbamates as switchable RAFT agents.
  • Controlled radical polymerization of LAMs (e.g., vinyl acetate) using these agents.
  • Activation of RAFT agents with protic or Lewis acids.
  • Controlled radical polymerization of MAMs (e.g., acrylates) after activation.
  • Synthesis of poly(MAM)-block-poly(LAM) copolymers.

Main Results:

  • The new RAFT agents provide excellent control over LAM polymerization.
  • Acid activation transforms the agents to effectively control MAM polymerization.
  • The switchable agents allow for the sequential synthesis of block copolymers.
  • Resulting block copolymers exhibit narrow molecular weight distributions.

Conclusions:

  • N-(4-pyridinyl)-N-methyldithiocarbamates represent a versatile class of switchable RAFT agents.
  • These agents overcome the monomer-specific limitations of traditional RAFT agents.
  • They offer a powerful tool for synthesizing complex polymer architectures, including block copolymers, with high precision.