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Related Experiment Videos

Jamming under tension in polymer crazes.

Jörg Rottler1, Mark O Robbins

  • 1Department of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21218, USA.

Physical Review Letters
|November 22, 2002
PubMed
Summary
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Tension in glassy polymers creates a fibril and void network. Entanglements and friction jam this expanded state, leading to tensile forces with implications for material strength.

Area of Science:

  • Polymer Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Glassy polymers under tension typically form crazes, a network of fibrils and voids.
  • Understanding the mechanical behavior of these expanded jammed states is crucial for material design.

Purpose of the Study:

  • To investigate the unique expanded jammed state formed in glassy polymers under tension.
  • To analyze the force distribution within this fibrillar network.

Main Methods:

  • Utilizing molecular dynamics simulations to model the behavior of glassy polymers under tensile stress.
  • Analyzing the resulting network of fibrils and voids.

Main Results:

  • Identified an expanded jammed state characterized by a network of fibrils and voids.

Related Experiment Videos

  • Observed an exponential distribution of tensile forces, distinct from the compressive forces in dense jammed systems.
  • Entanglements and interchain friction were identified as key factors jamming the system.

    • Conclusions:

    • The tensile force distribution in polymer crazes has significant implications for understanding fibril breakdown.
    • This force distribution is critical for determining the ultimate strength of crazed polymers.