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How Depolymerization-Based Plasticization Affects the Process of Cold Crystallization in Poly(P-Dioxanone).

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Self-plasticization of poly-(p-dioxanone) above 150°C significantly alters its crystallization and thermal properties. This process impacts polymer chain mobility, crystal growth, and mechanical characteristics.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Crystallization Studies

Background:

  • Self-plasticization, an increase in polymer chain mobility via monomer inclusion, affects polymer properties.
  • Poly-(p-dioxanone) (PDX) is a polymer whose structural, thermal, and mechanical characteristics can be influenced by self-plasticization.

Purpose of the Study:

  • To investigate the impact of thermally induced self-plasticization on poly-(p-dioxanone) crystallization.
  • To analyze changes in crystal growth from amorphous and molten states due to self-plasticization.

Main Methods:

  • Differential Scanning Calorimetry (DSC)
  • Optical and Raman Microscopies
  • Thermo-Mechanical Analysis (TMA)
  • Size Exclusion Chromatography with Multi-Angle Light Scattering (SEC-MALS)
  • X-ray Diffraction Analysis (XRD)

Main Results:

  • Significant changes in PDX crystallization and mechanical properties observed above 150°C (depolymerization temperature).
  • Intense self-plasticization decreased crystallization temperature, increased crystal growth rate, eliminated polymorphic transition, and lowered melting temperature.
  • Self-plasticization did not significantly alter crystallite magnitude, localization, or morphology, which were primarily governed by crystal growth temperature.

Conclusions:

  • Thermally induced self-plasticization above 150°C profoundly affects PDX crystallization behavior and thermal properties.
  • The study discusses the manifestation of the variable activation energy concept in the observed crystallization data.