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Types of Step-Growth Polymers: Polyesters01:20

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High-Performance Recyclable Polyester Elastomers Through Transient Strain-Stiffening.

Chang Gao1, Kam C Poon1, Matilde Concilio1

  • 1Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, United Kingdom.

Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

New amorphous block polyester elastomers achieve high strength and elasticity using transient strain-stiffening, enhancing mechanical properties while maintaining recyclability for sustainable materials.

Keywords:
block copolymerhigh‐performancemechanical propertiespolycaprolactonepolyestersustainable polymerthermoplastic elastomers

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Polyester thermoplastic elastomers offer sustainability but often compromise mechanical properties like strength and elasticity.
  • Achieving strong and tough elastomers typically involves complex formulations and cross-linking/crystallinity control, hindering recyclability.
  • Current approaches face challenges in balancing mechanical performance with ease of recycling.

Purpose of the Study:

  • To develop novel amorphous block polyester elastomers with improved mechanical properties and recyclability.
  • To introduce transient strain-stiffening into fully amorphous structures for enhanced strength and toughness.
  • To create sustainable elastomers that overcome the limitations of existing materials.

Main Methods:

  • Controlled polymerization of commercial monomers to create block copolymers.
  • Synthesis of amorphous block polyester elastomers with a central poly(ɛ-caprolactone-co-ɛ-decalactone) block and poly(cyclohexene oxide-alt-phthalate) flanking blocks.
  • Tuning thermomechanical properties by adjusting the ratio of ɛ-caprolactone to ɛ-decalactone.

Main Results:

  • The best elastomers (30-50 wt.% polycaprolactone) achieved tensile strengths up to 40 MPa and elongations at break >2000% with >90% elastic recovery.
  • Materials exhibited strain-induced crystallization, outperforming commercial elastomers in tensile mechanical properties.
  • Demonstrated a wide service temperature range (-60 to 140 °C), high thermal stability (≥300 °C), and excellent recyclability.

Conclusions:

  • Transient strain-stiffening in amorphous block polyester elastomers enhances strength and toughness while preserving recyclability.
  • These novel materials represent a significant advancement in sustainable elastomer technology.
  • The developed elastomers offer a superior combination of mechanical performance, thermal stability, and recyclability.