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Related Concept Videos

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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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Molecular Weight of Step-Growth Polymers01:08

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Updated: Aug 24, 2025

Preparation of Biopolymer Aerogels Using Green Solvents
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Weldable and closed-loop recyclable monolithic dynamic covalent polymer aerogels.

Xinhai Zhang1, Jun Zhao1, Kai Liu1

  • 1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240, China.

National Science Review
|October 21, 2022
PubMed
Summary

Researchers developed novel dynamic covalent polymer aerogels (DCPAs) offering enhanced mechanical properties and unique features like repairability and recyclability. These advanced aerogels overcome limitations of traditional materials for sustainable applications.

Keywords:
aerogelclosed-loop recyclabilitydegradabilitydynamic covalent polymerweldability

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Traditional aerogels possess desirable properties like low density and high porosity but suffer from brittleness, cracking, and non-degradability.
  • Existing limitations hinder the large-scale production and versatile application of conventional aerogels.

Purpose of the Study:

  • To introduce a new class of aerogels, dynamic covalent polymer aerogels (DCPAs), using dynamic covalent polymer chemistry.
  • To address the challenges of shrinkage, cracking, brittleness, and non-degradability associated with traditional aerogels.
  • To explore the potential of DCPAs for applications in thermal insulation and emulsion separation.

Main Methods:

  • Utilizing dynamic covalent polymer chemistry to synthesize novel aerogel structures.
  • Characterizing the porosity, mechanical properties (compression, bending, tensile), weldability, repairability, degradability, and recyclability of the DCPAs.
  • Demonstrating the practical application of DCPAs in thermal insulation and emulsion separation.

Main Results:

  • The synthesized DCPAs exhibit high porosity (90.7%-91.3%) and remarkable mechanical flexibility, withstanding 80% strain in compression and 30 mm diametral deflection in bending without cracking.
  • DCPAs demonstrate significant tensile properties, including an elongation at break of 32.7%.
  • The novel aerogels possess unique emergent properties such as weldability, repairability, degradability, and closed-loop recyclability, surpassing traditional aerogels.

Conclusions:

  • Dynamic covalent polymer chemistry provides a viable strategy for producing advanced aerogels with enhanced mechanical performance and desirable functionalities.
  • The developed DCPAs offer a versatile and sustainable material platform for various applications, including thermal insulation and emulsion separation.
  • This approach paves the way for a new generation of intelligent and sustainable aerogels with customizable features.