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Controlling Rheology of Fluid Interfaces through Microblock Length of Sequence-Controlled Amphiphilic Copolymers.

Xiaoxi Yu1, Guofang Li1, Bingqian Zheng1

  • 1Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA.

Macromolecular Chemistry and Physics
|January 2, 2023
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Microblock size in sequence-controlled amphiphilic copolymers tunes surface properties. Increasing microblock size enhances interfacial rheology, offering new ways to control fluid interfaces.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Surface Chemistry

Background:

  • Amphiphilic copolymers' surface properties, like contact angles, are influenced by microblock size.
  • Microblock length is a potential factor for tuning surface and interfacial characteristics.

Purpose of the Study:

  • To investigate the interfacial rheology of sequence-controlled amphiphilic copolymers.
  • To determine the effect of microblock size on the mechanical properties at the air-water interface.

Main Methods:

  • Synthesis of sequence-controlled copolymers with varying (AmBn)i microblock lengths (m, n, i = 1-6).
  • Interfacial rheometry to measure the storage modulus (G') at the air-water interface.
  • Small-angle X-ray scattering (SAXS) to analyze copolymer conformation in solution.

Main Results:

  • Interfacial storage modulus (G') increases with increasing microblock size.
  • Increased G' may correlate with larger interfacial hydrophobic domains.
  • Copolymers exhibit similar solution conformations, indicating interfacial assembly drives rheological changes.

Conclusions:

  • Demonstrates for the first time that microblock size controls interfacial rheology in amphiphilic copolymers.
  • Presents a novel strategy for controlling fluid interface dynamics using precision sequence-controlled polymers.