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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.
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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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...
Hydrolysis01:15

Hydrolysis

Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
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Olefin Metathesis Polymerization: Overview01:13

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.

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Updated: Jun 25, 2026

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Published on: November 30, 2020

Reprogramming hydrogen-bonding networks at the solvent-polymer interface for mixed polyester waste depolymerization

Xinping Li1, Zhaoqin Chu2, Huiying Zhang3

  • 1State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

Journal of Hazardous Materials
|June 23, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel solvent system using sulfolane to selectively depolymerize polyester from textile waste. This method achieves high purity terephthalic acid while preserving other fibers, enabling sustainable textile recycling.

Keywords:
Dynamic amphiphilic interfaceHydrogen-Bonding NetworksMixed polyester wasteSelective depolymerizationSulfolane

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Global textile waste poses significant environmental and health risks.
  • Recycling blended fabrics is challenging due to complex fiber structures and impure products.
  • Existing methods struggle with selective fiber separation and efficient chemical recovery.

Purpose of the Study:

  • To develop a selective depolymerization method for polyesters in mixed textile waste.
  • To achieve high-purity terephthalic acid (TPA) recovery.
  • To preserve the integrity of other textile fibers like cotton and spandex.

Main Methods:

  • Introduction of sulfolane into a solvent system to target polyester depolymerization.
  • Reprogramming hydrogen-bonding networks and swelling the PET matrix for efficient bond breaking.
  • Utilizing mild reaction conditions for selective polyester breakdown.

Main Results:

  • Achieved 99% purity of terephthalic acid (TPA) with a 99% monomer recovery rate.
  • Successfully preserved the structural integrity of cotton, spandex, and various plastics (PET, PLA).
  • Demonstrated solvent recyclability and in-situ decolorization capabilities.

Conclusions:

  • The developed sulfolane-based system offers a highly selective and efficient method for polyester depolymerization.
  • This approach provides a sustainable closed-loop strategy for textile waste management and chemical recovery.
  • The technology addresses key challenges in recycling blended textiles and engineering plastics.