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Related Concept Videos

Bioplastics01:27

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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.
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 polymer...

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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
10:22

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

Published on: November 30, 2020

Bio-inspired high-performance and recyclable cross-linked polymers.

Shen Yu1, Rongchun Zhang, Qiang Wu

  • 1Key Laboratory of Functional Polymer Materials of MOE, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|July 18, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed high-performance, recyclable polymers using bio-inspired Diels-Alder chemistry. These advanced materials offer excellent mechanical properties and can be reshaped and repaired, showcasing sustainable polymer innovation.

Keywords:
Diels-Alder reactioncross-linkhigh-performancepolyurethanerecyclability

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Area of Science:

  • Polymer Science and Engineering
  • Materials Chemistry
  • Sustainable Materials

Background:

  • Developing high-performance polymers with enhanced recyclability and repairability is crucial for sustainable material solutions.
  • Traditional cross-linked polymers often lack efficient recycling and reprocessing capabilities.
  • Bio-inspired molecular design offers novel pathways for creating advanced polymer architectures.

Purpose of the Study:

  • To design and synthesize high-performance, recyclable cross-linked polymers using a bio-inspired approach.
  • To incorporate reversible cross-links into segmented polyurethane to enable thermal reshaping and mending.
  • To investigate the structure-property relationships of the resulting hierarchical polymer network.

Main Methods:

  • Synthesis of linear segmented polyurethane with pendant maleimide groups.
  • Incorporation of furan cross-linkers to form reversible Diels-Alder cross-links.
  • Characterization of the hierarchical structure and mechanical properties (stiffness, strength, toughness).
  • Evaluation of thermal reshaping and re-mending capabilities.

Main Results:

  • Successful synthesis of cross-linked polyurethane with reversible Diels-Alder linkages.
  • The polymers exhibited a hierarchical structure.
  • Achieved excellent mechanical properties, including high stiffness, strength, and toughness.
  • Demonstrated efficient thermal reshaping and re-mending of the polymer material.

Conclusions:

  • Bio-inspired molecular design enables the creation of high-performance and recyclable cross-linked polymers.
  • Reversible Diels-Alder chemistry provides an effective strategy for incorporating dynamic cross-links.
  • The developed polyurethane materials offer a promising platform for sustainable and adaptable polymer applications.