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PLA/PA Bio-Blends: Induced Morphology by Extrusion.

Violeta García-Masabet1, Orlando Santana Pérez1, Jonathan Cailloux1

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Summary

This study shows that using rheologically modified Poly(Lactic Acid) (PLAREx) in blends with bio-based Polyamide 10.10 (PA) promotes micro-fibrillation, enhancing mechanical properties. Processing conditions significantly influence the final blend morphology and performance.

Keywords:
BioPA10.10PLAPLA/PA Bio-blendsin situ MFCs

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Area of Science:

  • Polymer Science
  • Materials Engineering
  • Rheology

Background:

  • Poly(Lactic Acid) (PLA) and bio-based Polyamide 10.10 (PA) are important biopolymers.
  • Understanding blend morphology is crucial for optimizing material properties.
  • Reactive extrusion can modify polymer melt elasticity.

Purpose of the Study:

  • To investigate the effect of processing conditions on the morphology of PLA/PA 70/30 blends.
  • To evaluate the in situ micro-fibrillation of the PA phase in neat PLA and rheologically modified PLA (PLAREx) blends.
  • To correlate blend morphology with mechanical performance.

Main Methods:

  • Twin-screw extrusion with varied screw speed and take-up velocity (Draw Ratios).
  • Rheological testing to determine viscosity and elasticity ratios.
  • Scanning Electron Microscopy (SEM) for morphology analysis.
  • Dynamic Mechanical Thermal Analysis (DMTA) for mechanical properties.

Main Results:

  • PLAREx promoted PA micro-fibrillation without hot stretching, unlike neat PLA which required hot stretching.
  • Increased Draw Ratio (DR) enhanced the aspect ratio of micro-fibrillated PA in PLAREx blends.
  • PLAREx blends exhibited improved mechanical performance in the rubbery region due to the obtained morphology.

Conclusions:

  • Rheologically modified PLA (PLAREx) is effective in promoting PA micro-fibrillation during melt processing.
  • Processing parameters, particularly hot stretching and DR, significantly influence the morphology of PLA/PA blends.
  • The developed PA micro-fibrillar morphology in PLAREx blends leads to enhanced mechanical properties.