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Electrospun Polylactide-Poly(ε-Caprolactone) Fibers: Structure Characterization and Segmental Dynamic Response.

Svetlana G Karpova1, Anatoly A Olkhov1,2, Ivetta A Varyan1,2

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This study explored polylactide (PLA) and poly(ε-caprolactone) (PCL) fibers, revealing how blending affects crystallinity and molecular dynamics. A key composition range was identified for phase inversion, crucial for material properties.

Keywords:
EPR correlation timeamorphous phasecrystalline phaseelectrospun fiberspolycaprolactonepolylactide

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Electrospun ultrathin fibers are crucial for various applications.
  • Understanding the molecular interactions in polymer blends is essential for tailoring material properties.
  • Polylactide (PLA) and poly(ε-caprolactone) (PCL) are biocompatible polymers with distinct characteristics.

Purpose of the Study:

  • To investigate the structural and dynamic properties of electrospun PLA/PCL blend fibers.
  • To determine the effect of varying PLA/PCL ratios on polymer blend characteristics.
  • To identify specific blend compositions that exhibit phase inversion.

Main Methods:

  • Fabrication of electrospun fibers using various PLA/PCL ratios (0/100 to 100/0).
  • Thermal analysis using Differential Scanning Calorimetry (DSC).
  • Electron Spin Resonance (ESR) spectroscopy with a stable TEMPO radical probe.

Main Results:

  • Significant changes in PLA/PCL crystallinity, segment mobility, and TEMPO probe sorption were observed upon blending.
  • The activation energy of TEMPO radical rotation in intercrystalline regions was evaluated.
  • A characteristic composition range (50/50 to 30/70% PLA/PCL) showed an inversion transition of PLA from a dispersive medium to a discrete phase.

Conclusions:

  • The ratio of PLA to PCL significantly influences the structural and dynamic properties of the blend fibers at a molecular level.
  • The study provides insights into the phase behavior and molecular dynamics of PLA/PCL blends.
  • Findings are critical for designing advanced PLA/PCL based materials with controlled properties.