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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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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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Chain Retraction in Highly Entangled Stretched Polymer Melts.

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Area of Science:

  • Polymer Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Strongly deformed polymer melts exhibit complex viscoelastic behavior.
  • The Doi-Edwards tube model and its GLaMM extension are key theoretical frameworks.
  • Previous studies have questioned the tube concept's validity.

Purpose of the Study:

  • Investigate polymer chain relaxation in nonlinear viscoelasticity.
  • Focus on anisotropic chain conformations after isochoric elongation.
  • Compare simulation results with GLaMM model predictions.

Main Methods:

  • Utilizing advanced computer simulations.
  • Studying highly entangled polymer melts.
  • Analyzing chain conformations and dynamics.

Main Results:

  • Observed initial contraction of chain extension in all directions for very long chains.
  • Found the retraction effect to be significantly weaker than GLaMM predictions.
  • The first anisotropic term of the 2D scattering function qualitatively agrees with GLaMM.

Conclusions:

  • The GLaMM model may overestimate chain retraction.
  • Simulation results suggest limitations of the current tube concept.
  • The 2D scattering function offers a path for experimental validation.