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Title: Role of Polymer Segment-Particle Surface Interactions in Controlling Nanoparticle Dispersions in Concentrated Polymer Solutions

The microstructure of particles suspended in concentrated polymer solutions is examined with small-angle X-ray scattering and small-angle neutron scattering. Of interest are changes to long wavelength particle density fluctuations in ternary mixtures of silica nanoparticles suspended in concentrated solutions of poly(ethylene glycol). The results are understood in terms of application of the pseudo-two-component polymer reference interaction site model (PRISM) theory modified to account for solvent addition via effective contact strength of interfacial attraction, εpc, in an implicit manner. The combined experimental-theoretical study emphasizes the complex interactions between solvent, polymer, and particle surface that control particle miscibility but also demonstrate that these factors can all be understood in terms of variations of εpc.
Authors:
;  [1]
  1. UIUC
Publication Date:
OSTI Identifier:
1023690
Resource Type:
Journal Article
Resource Relation:
Journal Name: Langmuir; Journal Volume: 27; Journal Issue: (17) ; 09, 2011
Publisher:
American Chemical Society
Research Org:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Org:
NSFDOE - BASIC ENERGY SCIENCESNIST
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CONTROL; DENSITY; DISPERSIONS; FLUCTUATIONS; INTERACTIONS; MICROSTRUCTURE; MIXTURES; NEUTRON DIFFRACTION; PARTICLES; POLYMERS; POLYETHYLENE GLYCOLS; SMALL ANGLE SCATTERING; SILICA; SOLUBILITY; SOLUTIONS; SOLVENTS; SUSPENSIONS; SURFACES; VARIATIONS; WAVELENGTHS; X-RAY DIFFRACTION