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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

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A dual-modality photoswitchable supramolecular polymer.

Qiwei Zhang1, Da-Hui Qu, Junchen Wu

  • 1Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, People's Republic of China.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 9, 2013
PubMed
Summary

Researchers created a novel dual-modality supramolecular polymer. This advanced material can switch between covalent and noncovalent forms using light, offering new possibilities for functional materials.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Stimuli-responsive polymers, both covalent and noncovalent, are advanced functional materials.
  • A significant gap exists in systems that can switch between covalent and noncovalent polymer states.
  • Unifying these polymer types offers a tunable platform combining their distinct chemical advantages.

Purpose of the Study:

  • To develop a method for creating a dual-modality supramolecular polymer.
  • To enable switching between noncovalent and covalent polymer states using light stimuli.
  • To construct a dual-stimuli responsive supramolecular hydrogel.

Main Methods:

  • Utilizing the reversible photodimerization of coumarins.
  • Employing host-guest interactions with gamma-cyclodextrin (γ-CD).
  • Incorporating cetyl trimethylammonium bromide (CTAB) for hydrogel formation.

Main Results:

  • A simple and effective method for constructing a switchable dual-modality supramolecular polymer was demonstrated.
  • The polymer successfully transitioned between noncovalent and covalent states upon light exposure.
  • A supramolecular hydrogel exhibiting dual-stimuli responsiveness was successfully fabricated.

Conclusions:

  • This work establishes a novel bridge between covalent and noncovalent polymer systems.
  • The developed methodology opens avenues for a new class of photoswitchable materials.
  • The findings promise advancements in designing tunable and responsive advanced functional materials.