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Anionic Chain-Growth Polymerization: Overview01:20

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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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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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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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Self-Recoverable, Energy-Dissipating, and Healable Chain-Extended Supramolecular Polyurethanes and Poly(urethane-urea)s for Impact-Resistant Systems.

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Related Experiment Video

Updated: Sep 9, 2025

Inkjet-printed Polyvinyl Alcohol Multilayers
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Inkjet-printed Polyvinyl Alcohol Multilayers

Published on: May 11, 2017

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Recyclable Base-Triggered "Debond-on-Demand" Aliphatic Polyurethane Adhesives: Engineering Adhesion for Use in Inkjet

Matthew J Hyder1, Jessica Godleman2, Andrew Kyriacou2

  • 1Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, U.K.

ACS Applied Engineering Materials
|August 28, 2025
PubMed
Summary

New polyurethanes offer strong adhesion and rapid debonding on demand using base solutions. These recyclable adhesives enhance substrate circularity and sustainability in industrial applications.

Keywords:
adhesivechain-extended polyurethanedebond-on-demanddepolymerizationinkjet printingrecycling

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Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Engineering

Background:

  • Strong polymeric adhesives are crucial but hinder substrate recycling.
  • Existing debond-on-demand adhesives often compromise strength for debonding efficiency.
  • Need for adhesives balancing high performance with recyclability.

Purpose of the Study:

  • To develop tailorable polymeric adhesives with high strength and rapid, base-induced debonding.
  • To engineer adhesives for improved substrate recyclability and material circularity.
  • To create printable inks from these novel adhesives.

Main Methods:

  • Incorporation of a base-degradable chain-extender into polyurethane synthesis.
  • Characterization of chain-extended polyurethanes (CEPUs) for adhesive strength and depolymerization kinetics.
  • Formulation of CEPUs into continuous inkjet (CIJ) printing inks.
  • Assessment of debonding efficiency and recyclability of CEPUs.

Main Results:

  • CEPUs exhibited high shear strength (8.20 MPa).
  • Base treatment caused rapid depolymerization (up to 88% loss in Mn) and significant strength reduction (up to 92% in 30 min).
  • CIJ-printed images were effectively removed from substrates after base treatment.
  • Recycled CEPUs retained their depolymerizable and debond-on-demand properties.

Conclusions:

  • Base-degradable chain-extended polyurethanes offer a tunable balance of adhesive strength and debondability.
  • This system provides an industrially viable route to enhance material recyclability and sustainability.
  • The developed adhesives are suitable for printable applications, enabling circular economy principles.