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Characteristics of Precipitation-formed Polyethylene Glycol Microgels Are Controlled by Molecular Weight of Reactants
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Rigidity Percolation Dictates Rheological Hysteresis Regime in Polypropylene during Crystallization and Melting.

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  • 1Materials Science and Engineering Division, NIST, Gaithersburg, Maryland 20899, United States.

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|March 2, 2026
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Summary
This summary is machine-generated.

Polymer crystallization and melting exhibit distinct rheological behaviors due to thermal pathways. This study reveals hysteresis in polypropylene

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Area of Science:

  • Polymer Science
  • Materials Science
  • Rheology

Background:

  • Structure-property relationships in polymer crystallization and melting are poorly understood.
  • Simultaneous measurement of crystallinity and rheological properties presents challenges.
  • Existing rheological models do not account for crystallization-melting asymmetry.

Purpose of the Study:

  • To directly measure rheological behavior as a function of crystallinity during polymer processing.
  • To investigate the asymmetry between polypropylene crystallization and melting.
  • To develop a model explaining the observed hysteresis.

Main Methods:

  • Simultaneous rheology and Raman spectroscopy were employed.
  • Polypropylene's rheological behavior was measured as a function of crystallinity.
  • A generalized effective medium (GEM) model was utilized to analyze data.

Main Results:

  • Polypropylene's rheological behavior differs significantly between crystallization and melting at identical crystallinity.
  • Hysteresis onset aligns with the percolation threshold calculated by the GEM model.
  • Two distinct hysteresis regimes were identified: pre-percolation and post-percolation.

Conclusions:

  • The study quantifies hysteresis and identifies distinct rheological regimes based on structural differences.
  • The findings provide a deeper understanding of polymer processing and structure-property relationships.
  • The results challenge existing rheological models by highlighting the asymmetry in polymer phase transitions.