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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Published on: August 2, 2012

Tunable swelling kinetics in core--shell hydrogel nanoparticles.

D Gan1, L A Lyon

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.

Journal of the American Chemical Society
|August 2, 2001
PubMed
Summary
This summary is machine-generated.

Core-shell poly-N-isopropylacrylamide (p-NIPAm) nanoparticles show tunable properties. Modifying the shell

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Area of Science:

  • Polymer science
  • Materials science
  • Colloid science

Background:

  • Thermoresponsive polymers, such as poly-N-isopropylacrylamide (p-NIPAm), are crucial for developing "smart" materials.
  • Core-shell microgel architectures offer a platform for precise control over material properties.
  • Understanding the kinetics and thermodynamics of phase transitions in microgels is key to their application.

Purpose of the Study:

  • To investigate the influence of chemical differentiation in core-shell p-NIPAm microgels on their phase transition behavior.
  • To explore the relationship between shell modification and the kinetics of thermo-induced collapse.
  • To determine if surface modification alone can control microgel deswelling rates.

Main Methods:

  • Seed and feed precipitation polymerization for synthesizing core-shell p-NIPAm microgels.
  • Differential scanning calorimetry (DSC) to analyze phase transition thermodynamics.
  • Proton nuclear magnetic resonance ((1)H NMR) and temperature-programmed photon correlation spectroscopy (TP-PCS) to study kinetics.

Main Results:

  • Hydrophobic modification of the shell with butyl methacrylate (BMA) significantly slows particle collapse.
  • The thermodynamics of the phase transition remain largely unaffected by low levels of hydrophobic shell modification.
  • The rate of microgel deswelling is primarily determined by shell hydrophobicity, not the thickness of the modified region.

Conclusions:

  • Core-shell architecture is effective for designing smart gels with tunable properties.
  • Surface modification of the shell is sufficient to control microgel deswelling kinetics.
  • The formation of a surface skin layer during collapse is the rate-limiting step for deswelling.