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Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Related Experiment Video

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Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization
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CO2 -Breathing Polymer Assemblies via One-Pot Sequential RAFT Dispersion Polymerization.

Min Zeng1, Meng Huo1, Yujun Feng2

  • 1Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China.

Macromolecular Rapid Communications
|June 21, 2018
PubMed
Summary

Researchers developed novel triblock copolymer assemblies with a unique "breathing" behavior. These smart materials reversibly expand and shrink in response to carbon dioxide (CO2), offering potential for advanced applications.

Keywords:
ABC triblock copolymersCO2-responsivepolymerization-induced self-assemblysequential RAFT polymerization

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • ABC triblock copolymers offer tunable properties for self-assembly.
  • Stimuli-responsive polymers are crucial for advanced material design.
  • Carbon dioxide (CO2) responsiveness provides a unique trigger mechanism.

Purpose of the Study:

  • To synthesize and characterize novel ABC triblock copolymer assemblies.
  • To investigate the morphology evolution of these assemblies.
  • To demonstrate the reversible CO2-responsive "breathing" behavior.

Main Methods:

  • One-pot sequential reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization.
  • Synthesis of poly[oligo(ethylene glycol) methyl ether methacrylate]-b-poly(benzyl methacrylate)-b-poly[2-(diethylamino)ethyl methacrylate] (POEGMA-b-PBnMA-b-PDEA).
  • Morphological characterization and stimuli-responsive behavior evaluation.

Main Results:

  • Assemblies exhibited morphology changes (spheres, worms, vesicles) with varying block copolymer compositions.
  • Morphologies remained stable in ethanol and water, with size reduction in water.
  • Demonstrated reversible size expansion/shrinkage upon CO2/Ar cycling due to PDEA block protonation/deprotonation.

Conclusions:

  • Successfully fabricated CO2-responsive triblock copolymer assemblies with tunable morphologies.
  • The "breathing" behavior is attributed to the pH-sensitive PDEA block.
  • These materials show promise for applications requiring controlled size modulation and stimuli-responsiveness.