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Dispersing Grafted Nanoparticle Assemblies into Polymer Melts through Flow Fields.

Joseph Moll1, Sanat K Kumar2, Frank Snijkers3,4

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|May 24, 2022
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Summary
This summary is machine-generated.

Shear flow does not improve nanoparticle dispersion in polymer melts. Instead, polymer-grafted nanoparticles self-assemble into superstructures without flow, with anisotropic assemblies breaking and re-forming under strain.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Flow fields are commonly employed to disperse larger particles in polymer melts.
  • The behavior of polymer-grafted nanoparticles under shear flow in polymer melts is not fully understood.
  • Understanding nanoparticle dispersion and self-assembly is crucial for developing advanced materials.

Purpose of the Study:

  • To investigate the effect of shear flow on the spatial dispersion and ordering of polymer-grafted nanoparticles in a polymer melt.
  • To explore the self-assembly behavior of these nanoparticles in the absence of flow.
  • To determine the influence of flow fields on pre-formed nanoparticle superstructures.

Main Methods:

  • Rheology was used to characterize the flow behavior of the nanoparticle-polymer system.
  • X-ray scattering provided insights into the spatial arrangement and ordering of nanoparticles.
  • Electron microscopy allowed for direct visualization of nanoparticle dispersion and superstructure formation.

Main Results:

  • Shear flow did not enhance the dispersion or ordering of spherical polymer-grafted nanoparticles in the melt.
  • In the absence of flow, nanoparticles spontaneously self-assembled into various superstructures within the homopolymer matrix.
  • Anisotropic nanoparticle assemblies fragmented under shear, with components aligning locally, but ultimately coarsened into large aggregates due to strong interparticle attractions.

Conclusions:

  • Shear flow is ineffective in improving the dispersion of polymer-grafted nanoparticles in polymer melts.
  • Self-assembly is a dominant mechanism for nanoparticle organization in these systems, surpassing the influence of flow fields.
  • Interparticle attractions play a critical role in the aggregation behavior of nanoparticles under large deformations, overriding flow effects.