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Crosslinked bicontinuous biobased PLA/NR blends via dynamic vulcanization using different curing systems.

Daosheng Yuan1, Kunling Chen1, Chuanhui Xu2

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Summary

This study prepared biosourced polymer blends of polylactide (PLA) and natural rubber (NR) using dynamic vulcanization. The 60/40 PLA/NR blend showed the best mechanical properties and thermal stability.

Keywords:
BlendsCuring of polymersMechanical propertiesMorphology

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Area of Science:

  • Polymer Science
  • Materials Science
  • Sustainable Materials

Background:

  • Polylactide (PLA) and natural rubber (NR) are fully biosourced polymers with distinct properties.
  • Developing sustainable polymer blends is crucial for reducing reliance on fossil fuels.
  • Understanding interfacial interactions is key to optimizing blend performance.

Purpose of the Study:

  • To prepare and characterize blends of polylactide (PLA) and natural rubber (NR) using dynamic vulcanization.
  • To investigate the effect of dynamic vulcanization on the molecular weight of PLA and interfacial compatibilization.
  • To evaluate the mechanical and thermal properties of the resulting PLA/NR blends.

Main Methods:

  • Dynamic vulcanization of PLA/NR blends using dicumyl peroxide (DCP), sulphur (S), and phenolic resin (2402) as curing agents.
  • Gel permeation chromatography (GPC) to analyze PLA molecular weight changes.
  • Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) for interfacial analysis.
  • Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) for thermal property evaluation.

Main Results:

  • The crosslinked natural rubber (NR) phase formed a continuous structure in all blends.
  • Molecular weight changes in PLA and interfacial compatibilization significantly influenced blend properties.
  • The PLA/NR blend (60/40 w/w) prepared with DCP-induced dynamic vulcanization exhibited superior mechanical properties and thermal stability.

Conclusions:

  • Dynamic vulcanization is an effective method for creating compatible biosourced PLA/NR blends.
  • Interfacial compatibilization and PLA molecular integrity are critical for achieving optimal blend performance.
  • The 60/40 PLA/NR blend demonstrates significant potential as a sustainable material with enhanced properties.