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Sugar alcohol-based deep eutectic solvents (DES) enhance thermoplastic starch (TPS) films, improving elongation and mechanical properties. These novel plasticizers offer superior performance compared to traditional glycerol.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Green Chemistry

Background:

  • Thermoplastic starch (TPS) is a biodegradable polymer with potential applications in packaging.
  • Traditional plasticizers like glycerol can have limitations in improving TPS properties.
  • Deep eutectic solvents (DES) offer a tunable and potentially more effective alternative for modifying polymer matrices.

Purpose of the Study:

  • To prepare and evaluate sugar alcohol-based deep eutectic solvents (DES) as plasticizers for thermoplastic starch (TPS).
  • To investigate the effect of conditioning (preheating, storage time) and processing methods (thermocompression, extrusion) on TPS properties.
  • To compare the performance of DES-plasticized TPS with TPS plasticized by glycerol.

Main Methods:

  • Preparation of sugar alcohol-based DES.
  • Fabrication of TPS films via thermocompression and extrusion.
  • Mechanical testing (tensile strength, elongation at break).
  • Structural and thermal analysis (XRD, DMA, FTIR-ATR, moisture sorption).

Main Results:

  • Sorbitol-based DES significantly improved elongation at break (33%) and tensile strength (8.6 MPa) of TPS compared to sorbitol alone.
  • Extrusion processing at 100 rpm yielded TPS films with enhanced properties (up to 10 MPa TS, 52% elongation).
  • DES demonstrated stronger interactions with starch than glycerol, leading to improved mechanical properties and inhibited starch recrystallization over one year.

Conclusions:

  • Sugar alcohol-based DES are effective plasticizers for thermoplastic starch.
  • DES improve mechanical properties and stability of TPS films.
  • DES offer a promising alternative to conventional plasticizers for sustainable polymer applications.