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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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.
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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...

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Closed-Loop Recyclable High-Performance Polyimine Aerogels Derived from Bio-Based Resources.

Changlin Wang1, Fabian Eisenreich1, Željko Tomović1,2

  • 1Polymer Performance Materials Group, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, MB, 5600, The Netherlands.

Advanced Materials (Deerfield Beach, Fla.)
|December 10, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed new bio-based polyimine aerogels with reversible bonds for enhanced thermal stability and flame resistance. These advanced materials offer efficient closed-loop recycling, paving the way for sustainable superinsulating applications.

Keywords:
aerogelsclosed-loop recyclingnanomaterialspolyiminesuperinsulationsustainabilitythermal stability

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Organic aerogels are highly porous, ultralight materials with applications in insulation and energy storage.
  • Current organic aerogels face challenges including poor thermal stability, fire hazards, and environmental concerns due to fossil-based origins and non-recyclability.
  • A need exists for advanced organic aerogels that are thermally stable, flame resistant, and environmentally sustainable.

Purpose of the Study:

  • To develop next-generation organic aerogels with improved thermal stability, flame resistance, and recyclability.
  • To utilize bio-based reagents for reduced environmental impact and enhanced material properties.
  • To demonstrate a closed-loop recycling process for polyimine aerogels.

Main Methods:

  • Synthesis of polyimine aerogels using primary amines and cyclophosphazene derivatives derived from bio-based vanillin and 4-hydroxybenzaldehyde.
  • Incorporation of reversible chemical bonds within the aerogel network for on-demand cleavage.
  • Characterization of aerogel properties including porosity, surface area, thermal stability, and flame resistance.
  • Evaluation of recyclability under acidic conditions and monomer recovery.

Main Results:

  • The synthesized polyimine aerogels exhibit low shrinkage, high porosity, and large surface area.
  • The materials demonstrate pronounced thermal stability and flame resistance.
  • Excellent recyclability was achieved under acidic conditions, with high monomer recovery yields and purity.
  • Fresh aerogels were successfully prepared from the recovered monomers, confirming efficient closed-loop recycling.

Conclusions:

  • Bio-based polyimine aerogels with reversible bonds offer a sustainable alternative to conventional organic aerogels.
  • These materials possess high performance characteristics, including superior thermal stability and flame resistance.
  • The demonstrated closed-loop recycling process highlights the potential for environmentally friendly production and application of advanced aerogels.