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Performance of Recycled Opaque PET Modified by Reactive Extrusion.

Noel León-Albiter1, Orlando O Santana1, Leandro Martinez Orozco1

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Two reactive extrusion methods enhanced recycled poly(ethylene terephthalate) (rPET-O) structural integrity. The rPET-O/polycarbonate blend significantly improved fracture toughness compared to the multi-epoxide agent modification.

Keywords:
LEFMfractureinstrumented impactreactive extrusionrecycled opaque PET (rPET-O)

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Mechanical Engineering

Background:

  • Recycled poly(ethylene terephthalate) (rPET-O) often requires structural enhancement for broader applications.
  • Reactive extrusion offers a pathway to modify polymer properties in situ.
  • Understanding fracture parameters is crucial for assessing material performance.

Purpose of the Study:

  • To comparatively study the structural integrity of modified opaque recycled poly(ethylene terephthalate) (rPET-O).
  • To evaluate two reactive extrusion techniques: multi-epoxide agent (REx-rPET-O) and rPET-O/polycarbonate (PC) blend.
  • To quantify the impact of these modifications on fracture parameters.

Main Methods:

  • Reactive extrusion was employed to modify rPET-O.
  • Differential scanning calorimetry (DSC) and rheological dynamic analysis (RDA) confirmed chemical modifications.
  • Instrumented pendulum impact testing (SENB configuration) quantified fracture parameters like stress-intensity factor (KQ) and specific work of fracture (wf).

Main Results:

  • Both modifications increased the stress-intensity factor (KQ) by 16% (REx-rPET-O) and 20% (rPET-O/PC) compared to unmodified rPET-O.
  • The rPET-O/PC blend showed a significant 61% increase in specific work of fracture (wf), versus 11% for REx-rPET-O.
  • The rPET-O/PC modification resulted in a random copolymer, decreasing rPET-O's crystallization capacity and crystalline perfection.

Conclusions:

  • Reactive extrusion effectively enhances the structural integrity and fracture toughness of rPET-O.
  • The rPET-O/PC blend modification offers superior improvement in fracture properties compared to the multi-epoxide agent.
  • The observed differences are attributed to chain branching (REx-rPET-O) versus in-situ copolymer formation (rPET-O/PC), impacting crack propagation mechanisms.