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Nonionic Polymer with Flat Upper Critical Solution Temperature Behavior in Water.

Md D Hossain1, Carlos Fitzgerald Grandes Reyes1, Changhe Zhang1

  • 1Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia.

Biomacromolecules
|December 13, 2021
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Summary
This summary is machine-generated.

Researchers developed a new polymer, PMEGA, with a tunable upper critical solution temperature (UCST) in water. This smart polymer exhibits predictable phase transitions, offering potential for diverse biological applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials

Background:

  • Designing polymers with tunable thermosensitivity is crucial for advanced applications.
  • Existing polymers often lack predictable and tunable upper critical solution temperature (UCST) behavior.
  • Poly(N-isopropylacrylamide) (PNIPAM) is widely used due to its lower critical solution temperature (LCST).

Purpose of the Study:

  • To rationally design and synthesize a novel nonionic polymer with a flat and tunable UCST.
  • To investigate the influence of copolymer composition and salt concentration on the UCST.
  • To explore the potential biological applicability of the new polymer system.

Main Methods:

  • Reversible addition fragmentation chain transfer (RAFT) polymerization was used to synthesize the polymer.
  • The monomer was synthesized in one pot from commercially available starting materials.
  • UCST was measured for the homopolymer and random copolymers with varying compositions.
  • The effect of NaCl concentration on UCST was investigated.

Main Results:

  • A well-defined nonionic polymer, poly(2-(methacryloyloxy) ethylureido glycinamide) (PMEGA), was synthesized with a flat and tunable UCST.
  • Strong hydrogen-bonding side groups induced sharp coil-to-globule transitions below the UCST.
  • Copolymers exhibited tunable UCST from 7 to 65 °C with increasing butyl methacrylate content.
  • UCST decreased linearly with NaCl concentration, demonstrating a predictable "salting-in" effect.

Conclusions:

  • The synthesized PMEGA and its copolymers demonstrate a predictable and tunable flat UCST.
  • Strong side-group hydrogen bonding is key to the observed tunable thermosensitivity.
  • This polymer system holds promise for broad biological applications, analogous to LCST-based polymers.