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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Interfacial interactions in polymer-layered silicate nanocomposites.

Ryo Kato1, Christopher M Liauw, Norman S Allen

  • 1Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, U.K. r.kato@mmu.ac.uk

Langmuir : the ACS Journal of Surfaces and Colloids
|January 22, 2008
PubMed
Summary

Water on sodium montmorillonite (Na-MMT) affects probe adsorption, hindering alcohols and ethers but not amines. Drying Na-MMT enhances probe retention and influences polyurethane component interactions.

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Area of Science:

  • Materials Science
  • Clay Mineralogy
  • Polymer Chemistry

Background:

  • Sodium montmorillonite (Na-MMT) is a clay mineral with applications in polymer composites.
  • Understanding probe interactions with Na-MMT is crucial for polyurethane system development.
  • The role of adsorbed water in modifying clay surface properties is not fully understood.

Purpose of the Study:

  • To investigate the adsorption behavior of various probes on Na-MMT.
  • To determine the effect of preadsorbed water on Na-MMT's adsorption properties.
  • To model interactions relevant to polyurethane components using specific probes.

Main Methods:

  • Flow microcalorimetry (FMC) for measuring adsorption enthalpies.
  • Diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) for identifying chemical linkages.
  • Wide-angle X-ray scattering (WAXS) for analyzing structural changes and intercalation.

Main Results:

  • Preadsorbed water on Na-MMT hindered alcohol and ether adsorption but minimally affected amines.
  • Drying Na-MMT increased probe adsorption heat and retention, with PPG showing strong multipoint adsorption.
  • Poly(propylene glycol) (PPG) intercalation depended on molecular weight, while 4-ethylphenyl isocyanate (4-EPI) formed urea linkages on undried Na-MMT and urethane linkages on dried Na-MMT.

Conclusions:

  • Water content significantly influences the adsorption of molecules onto Na-MMT.
  • Surface hydration of Na-MMT plays a critical role in the interaction with polyurethane precursors.
  • Tailoring Na-MMT hydration levels can control surface reactivity and material properties.