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How polymers lose memory with age.

Fabienne Grillard1, Cécile Zakri, Patrice Gaillard

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Polymers can remember processing temperatures due to dynamical heterogeneities. Aging at high temperatures causes memory loss by relaxing these heterogeneities, impacting polymer applications.

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Glassy Dynamics

Background:

  • Polymers exhibit unique temperature memory, retaining information about processing temperatures.
  • This phenomenon is linked to dynamical heterogeneities within glassy polymer domains.
  • Previous theories suggested heterogeneities store mechanical stress, but temporal effects were unexplored.

Purpose of the Study:

  • To experimentally investigate the influence of time on polymer temperature memory.
  • To elucidate the role of dynamical heterogeneities and their relaxation times in temperature memory.
  • To provide insights for optimizing polymer applications based on temperature memory.

Main Methods:

  • Experimental study of temporal effects on polymer temperature memory.
  • Analysis of residual stress as an indicator of memorized temperature.
  • Investigation of aging effects at elevated temperatures.

Main Results:

  • Demonstrated that aging at high temperatures shifts the residual stress maximum to higher temperatures.
  • Observed a loss of temperature memory correlated with aging time.
  • Linked this memory loss to the relaxation of dynamical heterogeneities with short characteristic times.

Conclusions:

  • The study clarifies the origin of polymer temperature memory, attributing it to dynamical heterogeneities.
  • Temporal effects, specifically aging, significantly impact and can reduce temperature memory.
  • Findings offer crucial insights for the effective utilization of temperature-memory polymers in various applications.