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This study shows how hydrogen bonding in polymer assemblies controls their function. Adjusting pH selectively alters interactions between poly(methacrylic acid) and micelles, impacting film properties and stimuli-responsive behavior.

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Area of Science:

  • Polymer science and materials chemistry
  • Supramolecular chemistry
  • Nanotechnology

Background:

  • Layer-by-layer (LbL) assemblies offer tunable material properties.
  • Understanding interactions within LbL films is crucial for controlling functionality.
  • Block copolymer micelles provide a versatile platform for functional LbL assemblies.

Purpose of the Study:

  • To establish a correlation between hydrogen-bonding selectivity and the functionality of micelle-containing LbL assemblies.
  • To investigate the role of pH and temperature on the interactions between poly(methacrylic acid) (PMAA) and upper critical solution temperature block copolymer micelles (UCSTMs).
  • To determine how different interaction modes affect the composition, structure, and stimuli-responsive behavior of LbL films.

Main Methods:

  • Fabrication of LbL films using PMAA and UCSTMs.
  • Isothermal titration calorimetry (ITC) to study thermodynamic interactions.
  • Spectroscopic ellipsometry and neutron reflectometry for film composition analysis.
  • Evaluation of temperature-controlled swelling and release properties.

Main Results:

  • Hydrogen bonding between PMAA and UCSTMs is pH and temperature-dependent.
  • ITC revealed distinct binding enthalpies for PMAA with micellar cores versus coronae.
  • pH 3 promoted PMAA binding with both corona and core, increasing PMAA incorporation in LbL films.
  • pH 4 favored selective PMAA interaction with the micellar corona, preserving temperature-controlled functionality.

Conclusions:

  • The selectivity of hydrogen-bonding interactions in LbL assemblies dictates film functionality.
  • Controlling pH allows for selective tuning of polymer-micelle interactions, impacting film structure and properties.
  • This approach provides a pathway to predict and control the stimuli-responsive behavior of assembled polymer systems.