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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...
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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...
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.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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.
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...

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Updated: Jun 27, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

Chemically Recyclable Thermoplastic Elastomers: Preparation, Properties, and On-Demand Depolymerization.

Yingying Liu1, Yong Shen1

  • 1State Key Laboratory of Advanced Optical Polymer and Manufacturing Technology, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.

Precision Chemistry
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

Thermoplastic elastomers (TPEs) are now chemically recyclable, enabling selective depolymerization back to monomers. This review covers their preparation, properties, and recycling, addressing plastic waste challenges.

Keywords:
block copolyesterchemical recyclingclosed-loop recyclingdynamically cross-linked elastomeron-demand depolymerizationpolyolefinpolyurethanethermoplastic elastomer

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Significant progress in chemically recyclable polymers addresses plastic waste.
  • Thermoplastic elastomers (TPEs) with on-demand depolymerization are under-explored due to complex structures.
  • Challenges exist in selectively recycling diverse monomers from TPEs.

Purpose of the Study:

  • To review recent advancements in chemically recyclable thermoplastic elastomers (TPEs).
  • To focus on the preparation, mechanical properties, and recycling of these TPEs.
  • To discuss future directions for sustainable TPE development.

Main Methods:

  • Literature review of chemically recyclable TPEs.
  • Categorization of TPEs based on backbone structure (copolyesters, polyurethanes, polyolefins).
  • Discussion of dynamically cross-linked elastomers with chemical recyclability.

Main Results:

  • Overview of various chemically recyclable TPEs, including their synthesis and properties.
  • Demonstration of on-demand depolymerization and recycling capabilities.
  • Identification of key TPE classes amenable to chemical recycling.

Conclusions:

  • Chemically recyclable TPEs offer a promising solution for plastic waste.
  • Further research is needed to overcome challenges in TPE recycling.
  • Future directions include optimizing TPE design for enhanced recyclability.