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Related Experiment Videos

Liquidlike morphological transformations in monolamellar polymer crystals.

G Reiter1, G Castelein, J U Sommer

  • 1Institut de Chimie des Surfaces et Interfaces, CNRS, 15, rue Jean Starcky, B.P. 2488, 68057 Mulhouse Cedex, France.

Physical Review Letters
|June 21, 2001
PubMed
Summary

Polymer crystal morphology changes like liquids even below melting point. Annealing experiments show thermal history, not just temperature, dictates polymer crystal shape.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Crystallography

Background:

  • Polymer crystals exhibit complex morphologies influenced by thermal history.
  • Understanding molecular relaxations is key to predicting polymer crystal behavior.

Purpose of the Study:

  • To investigate morphological changes in polyethyleneoxide crystals during annealing below the melting point.
  • To explore the role of molecular relaxations in driving these changes.
  • To determine if a time-temperature superposition principle applies to polymer crystal morphology.

Main Methods:

  • Annealing experiments were conducted on monolamellar polyethyleneoxide crystals.
  • Morphological changes were observed on a micron scale.
  • Time-dependent observations of molecular relaxations and domain evolution were recorded.

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Main Results:

  • Significant liquid-like morphological changes, including shape and perimeter alterations, were observed in crystalline domains.
  • Formation of a molecular rim around lamellae hindered interior relaxation.
  • Hole formation within domains occurred over longer annealing times.
  • Spatial anisotropy in relaxations was evident.

Conclusions:

  • Polymer crystal morphology is sensitive to the thermal pathway, not solely temperature.
  • The observed morphological changes indicate a deviation from the time-temperature superposition principle.
  • Metastable folded states undergo significant relaxations leading to observable macroscopic changes.