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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
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Published on: January 27, 2016

Nanoparticle motion within glassy polymer melts.

Hongyu Guo1, Gilles Bourret, Muriel K Corbierre

  • 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

Gold nanoparticles in polystyrene melts exhibit diffusive motion at high temperatures. Near the glass transition, hyperdiffusive dynamics emerge, resembling aging in polymer glasses.

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Area of Science:

  • Materials Science
  • Polymer Physics
  • Nanotechnology

Background:

  • Understanding nanoparticle dynamics in polymer melts is crucial for materials design.
  • Polystyrene melts exhibit complex behavior near their glass transition temperature (Tg).

Purpose of the Study:

  • To investigate the motion of gold nanoparticles in polystyrene melts using X-ray photon correlation spectroscopy.
  • To characterize the temperature-dependent dynamics and identify underlying physical processes.

Main Methods:

  • Utilized X-ray photon correlation spectroscopy (XPCS) to probe nanoparticle motion.
  • Studied dilute suspensions of gold nanoparticles in low-molecular-weight polystyrene melts across a range of temperatures.

Main Results:

  • At high temperatures, nanoparticle motion is diffusive, following Vogel-Fulcher temperature dependence.
  • Above approximately 1.1Tg, a crossover to hyperdiffusive dynamics, linked to heterogeneous strain, was observed.
  • Below the crossover temperature, hyperdiffusive dynamics showed time dependence characteristic of polymer glass aging.

Conclusions:

  • Gold nanoparticle motion in polystyrene melts transitions from diffusive to hyperdiffusive behavior near the glass transition.
  • Hyperdiffusive dynamics are associated with heterogeneous strain and exhibit aging-like characteristics in polymer glasses.