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In situ Photo-rheology Monitors Viscoelastic Changes in Photo-responsive Polymer Networks
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Polymerization-induced viscoelastic phase separation in polyethersulfone-modified epoxy systems.

Yingfeng Yu1, Minghai Wang, Wenjun Gan

  • 1Department of Macromolecular Science and The Key Laboratory of Molecular Engineering of Polymer, Ministry of Education, Fudan University, Shanghai, 200433, China.

The Journal of Physical Chemistry. B
|October 28, 2008
PubMed
Summary
This summary is machine-generated.

Polyethersulfone (PES)-modified epoxy systems undergo phase separation during curing. Researchers observed a morphology transformation and correlated rheological behavior with phase development using multiple in situ techniques.

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Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
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Area of Science:

  • Polymer Science
  • Materials Science
  • Chemical Engineering

Background:

  • Epoxy resins are widely used thermosets.
  • Phase separation in polymer blends influences material properties.
  • Polyethersulfone (PES) modification can alter epoxy network formation.

Purpose of the Study:

  • To investigate the in situ polymerization-induced phase separation in PES-modified epoxy systems.
  • To correlate rheological behavior with morphological evolution during curing.
  • To understand the phase transition dynamics and characteristic relaxation times.

Main Methods:

  • In situ monitoring using optical microscopy, time-resolved light scattering (TRLS), scanning electron microscopy (SEM), and rheometry.
  • Continuous observation throughout the entire curing process.
  • Analysis of scattering vector decay and viscoelastic properties.

Main Results:

  • A viscoelastic transformation from phase inversion to bicontinuous morphology was observed at specific PES content.
  • Rheological behavior closely matched the observed morphology development.
  • TRLS data for phase inversion morphology showed exponential decay of the scattering vector.
  • Characteristic relaxation times followed the Williams-Landel-Ferry (WLF) equation.

Conclusions:

  • The study successfully monitored and characterized the complex phase separation process in PES-modified epoxy systems.
  • A strong correlation exists between rheological response and morphological changes.
  • The findings provide insights into controlling epoxy network structure and properties through phase separation.