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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: 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...
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...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...
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...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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Highly Dynamic Yet Stable Polyketimine Networks with Closed-Loop Recyclability and Topological Programmability.

Xiao Liu1, Ben He1, Yi Sheng1

  • 1State Key Laboratory of Chemical Engineering and Low-carbon Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China.

Journal of the American Chemical Society
|July 15, 2026
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This study introduces a novel polyketimine network for closed-loop plastic recycling. The material offers robust stability during use and efficient depolymerization under mild conditions, enabling sustainable polymer reuse.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Plastic pollution necessitates innovative recycling strategies.
  • Closed-loop recycling requires polymers with dynamic bonds for efficient depolymerization.
  • Balancing bond lability for recycling with material stability during use is challenging.

Purpose of the Study:

  • To design a polyketimine network for closed-loop recycling under mild conditions.
  • To achieve robust mechanical properties alongside efficient depolymerization.
  • To demonstrate tunable network properties through dynamic chemistry.

Main Methods:

  • Synthesis of a polyketimine network utilizing hindered ketimine bonds.
  • Evaluation of material stability under harsh conditions (high temperature and humidity).
  • Investigation of depolymerization triggered by solvent disruption of hydrophobic phases and water penetration.
  • Characterization of mechanical properties across a wide range of Young's modulus.

Main Results:

  • The polyketimine network exhibits stability under challenging environmental conditions.
  • Depolymerization is achieved efficiently using water and organic solvents without catalysts or reagents.
  • The material's Young's modulus can be tuned over six orders of magnitude.
  • Diverse network topologies are accessible through disassembly and reassembly.

Conclusions:

  • Hindered ketimine bonds enable a balance between material stability and recyclability.
  • The developed polyketimine network offers a versatile platform for next-generation recyclable polymers.
  • This approach provides a sustainable solution for plastic waste management.