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Programed Thermoresponsive Polymers with Cleavage-Induced Phase Transition.

Yukiya Kitayama1,2, Yasumichi Yazaki1, Junya Emoto1

  • 1Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.

Molecules (Basel, Switzerland)
|September 23, 2022
PubMed
Summary

Researchers developed a novel thermoresponsive polymer that changes properties over time. This cleavage-induced phase transition polymer offers a new concept for time-programed stimuli-responsive materials.

Keywords:
cleavage reactionphase boundarythermoresponsive polymer

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Stimuli-Responsive Polymers

Background:

  • Thermoresponsive polymers exhibit temperature-dependent solubility.
  • Anionic polymer conjugates can be modified for specific properties.
  • Cleavage-induced property changes are a developing area in materials science.

Purpose of the Study:

  • To develop a novel thermoresponsive polymer with a programmed phase transition.
  • To investigate the mechanism of cleavage-induced charge inversion and its effect on thermoresponsivity.
  • To introduce a new concept of time-programed stimuli-responsive polymers.

Main Methods:

  • Synthesis of water-soluble anionic polymer conjugates from polyallylamine and phthalic acid.
  • Induction of side chain cleavage in acidic aqueous media to trigger charge inversion.
  • Monitoring of phase transition behavior under varying conditions and time.

Main Results:

  • Successful development of a thermoresponsive polymer with a cleavage-induced phase transition property.
  • Demonstration of intrinsic charge inversion from anion to cation via side chain cleavage.
  • Observation of a shifting phase boundary due to changes in polymer composition during cleavage.
  • Phase transition occurred under fixed external conditions as the boundary reached the set temperature.

Conclusions:

  • A new class of time-programed stimuli-responsive polymer has been conceptualized.
  • Cleavage-induced phase transition offers a novel mechanism for controlling polymer behavior.
  • This work opens new avenues for designing advanced functional materials.