Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Sliding friction between polymer surfaces: a molecular interpretation.

Giuseppe Allegra1, Guido Raos

  • 1Dipartimento di Chimica, Materiali e Ingegneria Chimica G. Natta, Politecnico di Milano, Via L. Mancinelli 7, I-20131 Milano, Italy. giuseppe.allegra@polimi.it

The Journal of Chemical Physics
|April 22, 2006
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

The response of phytoplankton to pH-equilibrated ocean alkalinization: A mesocosm experiment with harbour waters.

Marine pollution bulletin·2025
Same author

The <i>ACTN-3</i> c.1729C>T (rs1815739) Polymorphism Is Associated with Match-Play Maximal Running Speed in Elite Football Players: A Preliminary Report.

Sports (Basel, Switzerland)·2025
Same author

The effect of ocean alkalinity enhancement on zooplankton standing stock and community composition in the Eastern Mediterranean Sea: a mesocosm study.

Marine environmental research·2025
Same author

Assessing the Limit of CO<sub>2</sub> Storage in Seawater as Bicarbonate-Enriched Solutions.

Molecules (Basel, Switzerland)·2024
Same author

Exploring the phase behavior of C8-BTBT-C8 at ambient and high temperatures: insights and challenges from molecular dynamics simulations.

Physical chemistry chemical physics : PCCP·2024
Same author

Fracture in Silica/Butadiene Rubber: A Molecular Dynamics View of Design-Property Relationships.

ACS polymers Au·2023

Friction in polymers depends on sliding velocity, unlike rigid bodies. Polymer chain reptation and internal viscosity explain why friction decreases at high velocities, aligning with experimental data.

Area of Science:

  • Polymer Physics
  • Tribology
  • Materials Science

Background:

  • Amonton's law describes friction for rigid bodies, stating friction is independent of velocity.
  • Polymer friction deviates, showing strong velocity dependence due to surface deformation and energy loss.

Purpose of the Study:

  • To develop a theoretical model for polymer friction based on chain dynamics.
  • To explain the observed velocity dependence of friction in polymers.

Main Methods:

  • Theoretical interpretation based on polymer chain reptation within "tubes."
  • Modeling internal viscosity and energy dissipation due to chain bond rotations.
  • Derivation of a linear differential equation for chain dynamics.

Main Results:

Related Experiment Videos

  • Friction force diminishes at high sliding velocities due to hindered intramolecular mobility.
  • The ratio of friction force to velocity (FV) decreases with increasing velocity.
  • Model predictions are consistent with experimental data on modified polystyrene and cross-linked polymers.

Conclusions:

  • Polymer friction is governed by chain dynamics, specifically reptation and internal viscosity.
  • The model successfully explains the velocity dependence and observed friction maximum.
  • Surface polymer layers are considered to be in a liquid state despite bulk being below glass transition temperature.