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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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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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pH response of sequence-controlled polyampholyte brushes.

Xin Yuan1, Harold W Hatch2, Jacinta C Conrad1

  • 1Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204, USA. jcconrad@uh.edu.

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|May 31, 2023
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Summary
This summary is machine-generated.

Sequence-controlled polyampholyte brushes (PABs) exhibit unique pH responses. Monomer sequence, not grafting density, dictates PAB behavior, enabling tunable stimuli-responsive surfaces.

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Area of Science:

  • Polymer Science
  • Surface Chemistry
  • Materials Science

Background:

  • Polyelectrolyte brushes (PEBs) exhibit well-defined pH responses.
  • Polyampholytes (PAs) in solution show sequence-dependent behavior.
  • Stimuli-responsive materials are crucial for advanced applications.

Purpose of the Study:

  • Investigate the pH response of sequence-controlled polyampholyte brushes (PABs).
  • Compare PAB behavior to traditional PEBs.
  • Determine the influence of monomer sequence and grafting density on PAB properties.

Main Methods:

  • Molecular simulation of PABs.
  • Analysis of ionization state, height, lateral structure, and chain conformations.
  • Varying pH, grafting density, and monomer sequence.

Main Results:

  • PABs show qualitatively different pH responses compared to PEBs.
  • Grafting density has a modest effect on PAB properties.
  • Monomer sequence strongly influences pH response, with larger block sizes increasing response extent due to intra-chain attractions and backfolding.

Conclusions:

  • Monomer sequence is a key factor in tuning PAB pH responsiveness.
  • Sequence-controlled PABs offer a method for creating tunable stimuli-responsive surfaces.
  • Findings align with solution-based polyampholyte behavior.