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Easy access to oxygenated block polymers via switchable catalysis.

Tim Stößer1, Gregory S Sulley1, Georgina L Gregory1

  • 1Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.

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|June 19, 2019
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Summary
This summary is machine-generated.

Researchers developed a one-pot synthesis for advanced block polyols using switchable catalysis. This method simplifies the creation of complex polymer architectures for versatile material applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Oxygenated block polyols are crucial in coatings, resins, and polyurethanes.
  • Current synthesis methods often involve multistep procedures or macroinitiator techniques.

Purpose of the Study:

  • To develop a straightforward, one-pot synthesis for ABA triblock and ABCBA pentablock polyols.
  • To utilize a switchable catalysis mechanism for controlled polymerization.

Main Methods:

  • Employed a commercial chromium catalyst system for polymerization.
  • Exploited mechanistic switches between anhydride/epoxide ring-opening copolymerization, epoxide ring-opening polymerization, and lactone ring-opening polymerization.
  • Investigated various anhydrides, epoxides, and chain-transfer agents to establish catalytic guidelines.

Main Results:

  • Achieved a controlled one-pot synthesis of poly(ether-b-ester-b-ether) and poly(ester-b-ether-b-ester'-b-ether-b-ester) block polyols.
  • Demonstrated the preparation of multiblock polymers with up to 15 blocks, (ABA)n, via sequential monomer addition.
  • Showcased post-functionalization and coupling methods for creating higher polymer structures.

Conclusions:

  • The switchable catalysis offers a highly controlled and straightforward route to complex block polyols.
  • This method simplifies the production of versatile polyols for advanced material applications.
  • The developed polyols show potential for further modification and integration into higher polymer systems.