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Electrospun Fibrous Membrane with Confined Chain Configuration: Dynamic Relaxation and Glass Transition.

Nuozi Zhang1,2, Chenhong Wang1,3, Hao Chen1

  • 1Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China.

Polymers
|March 10, 2022
PubMed
Summary

Electrospun membranes exhibit dynamic relaxation near the glass transition temperature (Tg). Differential scanning calorimetry reveals how annealing affects relaxation modes, showing that temperature and time influence molecular chain dynamics.

Keywords:
MCTPLGAelectrospun membranephysical agingrelaxation

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Thermodynamic glass transition processes in electrospun membranes are crucial for understanding their dynamic relaxation.
  • These membranes are not in a constant equilibrium state, exhibiting slow but measurable relaxation modes near and above the glass transition temperature (Tg).

Purpose of the Study:

  • To investigate the dynamic relaxation nature of electrospun membranes using thermodynamic principles.
  • To analyze relaxation processes and capture instantaneous

Main Methods:

  • Differential scanning calorimetry (DSC) experiments were employed to study the thermodynamic glass transition.
  • Mode-coupling theory (MCT) principles were applied to analyze endothermic peak temperature and relaxation enthalpy.
  • Electrospun membranes with varying molecular weights were subjected to different annealing times and temperatures.

Main Results:

  • Short- and long-wavelength relaxation modes were identified based on annealing conditions relative to the DSC-measured Tg.
  • Peak temperature (Tp) and enthalpy loss initially increased and then decreased with increasing annealing time.
  • Above the glass transition temperature (Ta > Tg), Tp and enthalpy loss decreased, shifting curves towards melting, irrespective of molecular weight.

Conclusions:

  • The study demonstrates the dynamic nature of glass transitions in polymeric materials.
  • Electrospinning combined with DSC and kinetic scanning provides a method to investigate dynamic relaxation processes.
  • Results align with the general principles of mode-coupling theory (MCT) for dynamic systems.