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Rheological Characteristics of Starch-Based Biodegradable Blends.

Dong-Il Park1, Yuzhen Dong2, Shizhao Wang3

  • 1R&F Chemical, Hanam 12925, Republic of Korea.

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|April 28, 2023
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Summary
This summary is machine-generated.

Thermoplastic starch blends with biodegradable polyesters like poly(lactic acid) (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) show improved performance. These polymer blends exhibit distinct viscoelastic liquid behavior, enhancing their material properties.

Keywords:
biodegradablemelt rheologypoly(butylene adipate-co-terephthalate)poly(lactic acid)starch

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomaterials

Background:

  • Thermoplastic starch (TPS) offers biodegradability but has limitations in performance and processability.
  • Blending TPS with synthetic biodegradable polyesters like poly(lactic acid) (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) can overcome these challenges.

Purpose of the Study:

  • To investigate the morphology, thermal properties, and rheological behavior of TPS/PBAT and TPS/PBAT/PLA blends.
  • To assess the impact of blending on the performance and processability of thermoplastic starch.

Main Methods:

  • Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) for morphology and elemental analysis.
  • Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) for thermal properties.
  • Rotational rheometry (steady shear and dynamic oscillation tests) to evaluate rheological behavior.

Main Results:

  • SEM and EDS confirmed the morphology and composition of the blends.
  • TGA and DSC provided insights into the thermal stability and transitions of the materials.
  • All samples displayed shear thinning behavior, well-described by the Carreau model.
  • TPS remained solid, while TPS/PBAT and TPS/PBAT/PLA blends showed viscoelastic liquid behavior above their melting temperatures, with frequency-dependent storage and loss moduli.

Conclusions:

  • Blending thermoplastic starch with PBAT and PLA significantly improves its performance and processability.
  • The resulting polymer blends exhibit tunable viscoelastic properties suitable for various applications.
  • These findings contribute to the development of advanced biodegradable materials.