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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Structure-Property Relationship and Multiple Processing Studies of Novel Bio-Based Thermoplastic Polyurethane

Joanna Smorawska1, Marcin Włoch1, Ewa Głowińska1

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Recycling bio-based thermoplastic polyurethane elastomers (bio-TPUs) through mechanical reprocessing enhances their tensile strength and elongation at break. These sustainable materials demonstrate improved properties after multiple cycles, supporting a circular economy for plastics.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Sustainable Chemistry

Background:

  • Growing demand for polymers necessitates effective recycling strategies.
  • Mechanical recycling of bio-based thermoplastic polyurethane elastomers (bio-TPUs) offers a sustainable waste management solution.

Purpose of the Study:

  • To investigate the impact of two mechanical reprocessing cycles on the properties of bio-TPUs.
  • To evaluate the recyclability and potential for circular economy applications of bio-TPUs.

Main Methods:

  • Synthesis of two series of bio-TPUs using solvent-free methods.
  • Characterization of raw and reprocessed bio-TPUs (chemical, physical, thermal, thermomechanical, mechanical properties).

Main Results:

  • Reprocessing altered phase separation, impacting bio-TPU properties.
  • Chemical structure remained largely consistent; thermal stability up to 300 °C.
  • Tensile strength increased by 34%, elongation at break by 200%; hardness decreased by 3-4 °ShA after two cycles.

Conclusions:

  • Bio-TPUs exhibit enhanced mechanical properties after multiple reprocessing cycles.
  • Recyclability of bio-TPUs supports the circular economy for plastics.
  • High bio-based content (78.4-78.8 wt.%) contributes to environmental benefits.