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Skeletal Network Enabling New-Generation Thermoplastic Vulcanizates.

Shuangjian Yu1, Siwu Wu1, Shifeng Fang1

  • 1Institute of Emergent Elastomers, School of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong, 510640, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|March 29, 2023
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Summary

Researchers developed a new method for recycling cross-linked rubbers by creating a skeletal network (SN) elastomer. This innovative approach allows for continuous reprocessing, offering a sustainable solution for rubber recycling with enhanced properties.

Keywords:
elastomersre-extrudabilityskeletal networksthermoplastic vulcanizatesupcycling

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Chemistry

Background:

  • Upcycling cross-linked rubbers (thermosetting polymers) is crucial for sustainability.
  • Integrating engineering performance with stable reprocessability in recycled rubbers remains a challenge.

Purpose of the Study:

  • To develop a straightforward strategy for creating recyclable elastomers with continuous reprocessability.
  • To enhance the engineering performance of recycled rubber materials.

Main Methods:

  • Constructing a skeletal network (SN) via interfacial crosslinking of rubbery granules within a rubber matrix.
  • Utilizing rapid exchange reactions of dynamic interfacial sulfides for solid-state "fragmentation and healing."

Main Results:

  • The developed SN elastomer exhibits continuous and stable re-extrudability due to dynamic network reconfiguration.
  • SN elastomers demonstrate high gel content, resilience, low creep, and competitive reinforcibility.
  • Performance of SN elastomers surpasses that of commercial thermoplastic vulcanizates (TPVs).

Conclusions:

  • A novel concept for thermoplastic vulcanizates (TPVs) is proposed, enabling sustainable rubber development.
  • The SN elastomer offers a promising alternative to traditional vulcanizates and commercial TPVs.
  • This work facilitates the continuous recycling and reuse of thermosetting rubbers.