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Related Concept Videos

Determination of Molar Masses of Polymers II01:27

Determination of Molar Masses of Polymers II

Polymer samples typically consist of macromolecular chains with a distribution of lengths, resulting in a range of molar masses rather than a single discrete value. Conventional descriptors such as the number-average molar mass and weight-average molar mass quantify this distribution but do not fully capture polymer behavior in solution..The viscosity-average molar mass provides a more realistic description of polymer behavior in solution because it accounts for the enhanced contribution of...

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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
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Measuring surface and bulk relaxation in glassy polymers.

D Qi1, M Ilton, J A Forrest

  • 1Department of Physics and Astronomy and Guelph-Waterloo Physics Institute, University of Waterloo, Ontario, Canada.

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Gold nanoparticle embedding into polystyrene surfaces reveals that enhanced surface mobility exists only near or below the bulk glass transition temperature. This finding challenges universal application of surface glass transition concepts for polymers.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Surface Science

Background:

  • Understanding polymer surface dynamics is crucial for material applications.
  • The behavior of polymers near surfaces can differ significantly from bulk properties.
  • Investigating polymer films at the nanoscale requires advanced characterization techniques.

Purpose of the Study:

  • To investigate gold nanoparticle embedding into polystyrene (PS) surfaces.
  • To differentiate between surface and bulk polymer behavior.
  • To examine polymer dynamics in the 20 nm region nearest the free surface across various temperatures and times.

Main Methods:

  • Comprehensive study of gold nanoparticle embedding into polystyrene films.
  • Experiments conducted at temperatures ranging from T(g) + 8 K to T(g) - 83 K.
  • Measurements performed over extended durations up to 10^5 minutes.

Main Results:

  • Enhanced surface mobility in polystyrene was observed only at temperatures near or below the bulk glass transition temperature (T(g)).
  • Surface relaxation times exhibited weak temperature dependence.
  • The enhanced mobility extended less than 10 nm into the polymer bulk near T(g).

Conclusions:

  • The concept of a universal "surface glass transition" may not apply to all polymers.
  • Using bulk glass transition temperatures to measure local mobility near interfaces might not be universally applicable.
  • Results provide a quantitative link for molecular dynamics simulations of polymer films and surfaces.