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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

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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...
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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Toward Sulfur-Free RAFT Polymerization Induced Self-Assembly.

Andrea Lotierzo1, Ryan M Schofield1, Stefan A F Bon1

  • 1Department of Chemistry, University of Warwick, Coventry, CV4 7AL, United Kingdom.

ACS Macro Letters
|June 2, 2022
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Summary
This summary is machine-generated.

Polymerization induced self-assembly (PISA) offers a novel route to colloidal objects. Researchers overcame challenges in chain-growth and monomer partitioning, achieving successful PISA with diverse morphologies.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Polymerization Induced Self-Assembly (PISA) is an emerging technique for creating colloidal structures.
  • Methacrylate-based macromonomers are unexplored RAFT agents for PISA due to low reactivity.
  • Heterogeneous polymerizations present challenges in controlling chain-growth and monomer partitioning.

Purpose of the Study:

  • To explore the use of methacrylate-based macromonomers as RAFT agents in PISA.
  • To address the obstacles of chain-growth control and monomer partitioning in PISA.
  • To achieve controlled self-assembly of colloidal objects using PISA.

Main Methods:

  • Investigated batch and semi-continuous dispersion polymerizations of hydroxypropyl methacrylate.
  • Utilized poly(glycerol methacrylate) macromonomers as RAFT agents in aqueous media.
  • Employed an amphiphilic thermoresponsive diblock copolymer to manage particle nucleation and monomer partitioning.
  • Analyzed particle morphology using Transmission Electron Microscopy (TEM).

Main Results:

  • Batch polymerizations showed limited control over chain-growth.
  • Semi-continuous monomer feeding offered partial improvement in control.
  • Employing a pre-phase-separated diblock copolymer successfully mitigated monomer partitioning.
  • Successful PISA was achieved, yielding various particle morphologies.

Conclusions:

  • Overcoming chain-growth and monomer partitioning is crucial for effective PISA.
  • A strategy involving a pre-formed diblock copolymer enables controlled PISA with methacrylate macromonomers.
  • This approach allows for the synthesis of diverse self-assembled colloidal structures.