---
title: "Sustainable Closed-Loop Circularity Unveiled in Epoxy Vitrimers with Covalent Adaptable Networks"
id: "2992"
type: "post"
slug: "sustainable-closed-loop-circularity-unveiled-in-epoxy-vitrimers-with-covalent-adaptable-networks"
published_at: "2024-01-03T14:23:04+00:00"
modified_at: "2023-12-21T13:53:09+00:00"
url: "https://www.plasticsengineering.org/2024/01/sustainable-closed-loop-circularity-unveiled-in-epoxy-vitrimers-with-covalent-adaptable-networks-002992/"
markdown_url: "https://www.plasticsengineering.org/2024/01/sustainable-closed-loop-circularity-unveiled-in-epoxy-vitrimers-with-covalent-adaptable-networks-002992.md"
excerpt: "The quest for advanced epoxy formulations has led to a groundbreaking development—fast-curing epoxies that achieve full curing within a mere two hours. This remarkable achievement is attributed to the integration of Vitrimer chemistries, ushering in a new era of rapid..."
taxonomy_category:
  - "Circular Economy"
  - "Editor's Choice Technical Paper"
  - "Process"
  - "Sustainability"
  - "Testing & Analysis"
  - "Trending"
taxonomy_post_tag:
  - "Epoxy"
  - "Vitrimers"
---

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# Sustainable Closed-Loop Circularity Unveiled in Epoxy Vitrimers with Covalent Adaptable Networks

 An illustration of recovery of fibers of SB vitrimer laminates samples at 150°C for 24 h in comparison with Traditional epoxy laminates.The quest for advanced epoxy formulations has led to a groundbreaking development—fast-curing epoxies that achieve full curing within a mere two hours. This achievement is attributed to the integration of Vitrimer chemistries, ushering in a new era of rapid turnaround times for epoxy applications.

At the heart of this innovation lies a dynamic curing agent, a bio-based Schiff motif, featuring cinnamaldehyde and mussel-inspired dopamine. This unique agent facilitates imine exchange during the curing process, ensuring the integrity of the network—a pivotal factor for achieving superior structural properties in epoxy-based components.

The resulting epoxy vitrimers exhibit an array of exceptional characteristics. With a tensile strength of 68 MPa and an impressively high glass transition temperature (Tg) of 128°C, these epoxies stand out in terms of both strength and thermal stability. Notably, they demonstrate fast stress relaxation, boasting a relaxation time of 15.2 seconds at 180°C, coupled with an activation energy of 105 kJ/mol.

(A) A schematic illustration of the re-processability, recyclability, malleability and re-usability of SB samples; (B) a qualitative study demonstrating solubility of epoxy vitrimers at 120°C in NMP solution at different time intervals.

What sets these epoxy vitrimers apart is their re-processability and reusability, attributes rarely found in traditional epoxy formulations. The dynamic exchange reactions inherent in the bio-based Schiff motif pave the way for closed-loop circularity in plastics, aligning with sustainable practices.

Moreover, these innovative epoxies showcase a self-healing property triggered by the exchangeable bonds. Surface conductivity measurements reveal the restoration of conducting pathways post self-healing, underscoring the potential for extending the lifespan of epoxy-based substrates.

In a further stride towards sustainability, the epoxies cured using the Schiff-based motif dissolve in a specific solvent, allowing for recovery and repurposing. This feature enhances the circularity of the epoxy, aligning with the growing emphasis on eco-friendly and recyclable materials in the plastics engineering landscape.

The fusion of Vitrimer chemistries and bio-based curing agents has given rise to a transformative epoxy formulation. Its fast curing, coupled with outstanding mechanical properties and innovative features like re-processability and self-healing, positions these epoxies as trailblazers in the realm of plastics engineering, opening up diverse applications across industries.

*You can learn more about this topic in the article “*[Covalent adaptable network offers “sustainable” closed-loop circularity in epoxy vitrimers](https://4spepublications.onlinelibrary.wiley.com/doi/full/10.1002/pls2.10113)
,” by [Sandeep Tripathi](https://4spepublications.onlinelibrary.wiley.com/authored-by/Tripathi/Sandeep)
, [Supriya H](https://4spepublications.onlinelibrary.wiley.com/authored-by/H/Supriya)
, [Suryasarathi Bose](https://4spepublications.onlinelibrary.wiley.com/authored-by/Bose/Suryasarathi)
, appearing in the December 2023 issue of [SPE Polymers](https://4spepublications.onlinelibrary.wiley.com/journal/26903857?__cf_chl_tk=j2ZK3dqq_TP2_49nAeWxdGDxiyYNFYUXvZlLhaaJQ8M-1702320691-0-gaNycGzNEyU)
.

By **[Plastics Engineering](https://www.plasticsengineering.org/author/pe-anonymous/)** | January 3, 2024

##### [Plastics Engineering](https://www.plasticsengineering.org/author/pe-anonymous/)

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