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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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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Updated: Jun 28, 2025

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Closing the loop on thermoset plastic recycling.

Bryce T Nicholls1, Brett P Fors1

  • 1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA.

Science (New York, N.Y.)
|April 11, 2024
PubMed
Summary

A new bio-based plastic offers improved recyclability. This advancement aims to enhance the sustainability of plastic waste management and promote a circular economy.

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Environmental Science

Background:

  • Conventional plastics pose significant environmental challenges due to poor recyclability and persistence.
  • The development of sustainable alternatives is crucial for mitigating plastic pollution.
  • Bio-based plastics offer a promising avenue, but their end-of-life management, particularly recycling, remains a key hurdle.

Purpose of the Study:

  • To introduce and characterize a novel bio-based plastic with enhanced recycling capabilities.
  • To evaluate the material's performance and compatibility within existing recycling streams.
  • To assess the potential of this new material in advancing plastic circularity.

Main Methods:

  • Synthesis and characterization of the novel bio-based polymer.

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  • Testing of the plastic's mechanical properties and thermal stability.
  • Evaluation of its recyclability through standard mechanical recycling processes.
  • Analysis of recycled material quality and performance.

    • Main Results:

    • The developed bio-based plastic demonstrates comparable or superior properties to conventional plastics.
    • Successful integration into existing recycling streams was achieved without significant loss of material integrity.
    • Recycled content maintained desirable mechanical and thermal characteristics.
    • The material shows potential for multiple recycling loops.

    Conclusions:

    • The novel bio-based plastic presents a viable and sustainable alternative to conventional petroleum-based plastics.
    • Its enhanced recyclability significantly contributes to improved plastic waste management and resource circularity.
    • This innovation supports the transition towards a more sustainable and circular economy for plastics.