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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Author Spotlight: Quantitative Characterization of Liquid Photosensitive Bioink Properties for Continuous Digital Light Processing Based Printing
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Digital Light Processing to Afford High Resolution and Degradable CO2-Derived Copolymer Elastomers.

Kam C Poon1, Maddison Segal2, Alexander J Bahnick3

  • 1Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, U.K.

Angewandte Chemie (International Ed. in English)
|June 19, 2024
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Researchers developed new 3D printable, degradable elastomers from carbon dioxide and bio-derived materials. This advancement expands the range of sustainable plastics and elastomers for additive manufacturing applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Additive Manufacturing

Background:

  • Vat photopolymerization 3D printing enables rapid, high-resolution manufacturing of polymer parts.
  • The current material selection and properties for 3D printing are limited.
  • There is a growing need for sustainable alternatives to petrochemical-based plastics and elastomers.

Purpose of the Study:

  • To report the successful additive manufacturing (AM) of novel poly(carbonate-b-ester-b-carbonate) elastomers.
  • To explore the use of a CO2-derived triblock copolymer in 3D printing resins.
  • To create tunable, degradable thermosets with potential for sustainable material applications.

Main Methods:

  • Synthesis of an ABA triblock copolymer using a Co(II)Mg(II) catalyst.
  • Formulation of the copolymer into resins for digital light processing (DLP) 3D printing.
  • Utilizing a thiol-ene crosslinking system with varying crosslinker length and poly(ethylene glycol) content.

Main Results:

  • Successful 3D printing of complex, triply periodic geometries at high resolution.
  • Production of elastomeric and degradable thermosets with tunable properties.
  • Thermomechanical characterization revealed printing-induced microphase separation and adjustable hydrophilicity.

Conclusions:

  • Digital light processing (DLP) can be used to rapidly produce high-resolution, sustainable materials from low molar mass polyols.
  • The developed 3D printable elastomers offer a promising alternative to conventional petrochemical-based options.
  • This work facilitates the production of functional, sustainable plastics and elastomers via additive manufacturing.