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Copolymerization with Polyether Segments Improves the Mechanical Properties of Biodegradable Polyesters.

Shuyi Wu1, Yang Zhang1, Jiarui Han1

  • 1Department of Chemical Engineering, Institute of Polymer Science and Engineering, Tsinghua University, Beijing 100084, China.

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|August 29, 2019
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Summary

This study enhanced poly(butylene succinate) (PBS) properties by creating copolymers with poly(tetramethylene glycol) (PTMG). The resulting poly[(butylene succinate)-co-poly(tetramethylene glycol)]s (PBSTMGs) showed improved strength and biodegradability.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomaterials

Background:

  • Poly(butylene succinate) (PBS) is a biodegradable polyester with potential applications.
  • Improving PBS properties like strength and biodegradability is crucial for wider adoption.
  • Copolymerization offers a route to tailor polymer characteristics.

Purpose of the Study:

  • To synthesize poly[(butylene succinate)-co-poly(tetramethylene glycol)]s (PBSTMGs) with varying poly(tetramethylene glycol) (PTMG) content.
  • To investigate the impact of incorporating flexible PTMG segments on PBS properties.
  • To compare the performance of PBSTMG copolymers with neat PBS.

Main Methods:

  • Melt polycondensation process to synthesize PBSTMG copolymers.
  • Differential scanning calorimetry (DSC) to analyze thermal properties.
  • Dynamic mechanical analysis (DMA) for mechanical properties.
  • Wide-angle X-ray diffraction (WAXD) for structural analysis.

Main Results:

  • PBSTMG copolymers exhibited lower melting temperature, crystallization temperature, and crystallinity than PBS, decreasing with higher PTMG content.
  • A significant reduction in storage modulus was observed across the temperature range for copolymers.
  • Copolymerization reduced spherulite size and introduced phase separation, enhancing elongation at break and impact strength (up to 4.5x PBS at 10 mol% PTMG).
  • Biodegradability of PBSTMG copolymers was significantly improved compared to PBS.

Conclusions:

  • Incorporating PTMG segments into PBS via copolymerization enhances mechanical properties, particularly impact strength and elongation at break.
  • The phase separation structure and reduced crystallinity contribute to improved mechanical performance.
  • Increased PTMG content leads to enhanced biodegradability of the resulting PBSTMG copolymers.