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Related Concept Videos

Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Hydrolysis

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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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Harnessing precision in hydrogel architectures through reversible-deactivation radical polymerisation techniques.

Amit Kumar1, Pratibha Sharma2, Andrew B Lowe1

  • 1Department of Chemistry, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates. amit.kumar@ku.ac.ae.

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Reversible-deactivation radical polymerisation (RDRP) techniques precisely synthesize advanced hydrogels with controlled structures. These methods offer superior control over network architecture for enhanced biomedical and material applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomedical Engineering

Background:

  • Hydrogels are versatile 3D network materials with broad applications in biomedicine, drug delivery, and tissue engineering.
  • Traditional synthesis via radical polymerization offers limited control over hydrogel structure and properties.
  • Precise control over hydrogel architecture is crucial for advanced functionalities.

Purpose of the Study:

  • To review recent advances in synthesizing hydrogels using reversible-deactivation radical polymerization (RDRP) techniques.
  • To highlight the advantages of RDRP over conventional polymerization methods for hydrogel synthesis.
  • To discuss design strategies for functionalizing RDRP-synthesized hydrogels.

Main Methods:

  • Utilizing reversible-deactivation radical polymerization (RDRP) techniques, including RAFT, ATRP, and NMP.
  • Precisely controlling polymer chain growth and crosslinking for molecular-level network architecture.
  • Integrating functional monomers and stimuli-responsive elements into hydrogel systems.

Main Results:

  • RDRP enables precise control over hydrogel network architecture and uniform functional group distribution.
  • Tailored swelling behavior, mechanical properties, and functional performance of hydrogels.
  • Development of advanced hydrogels with specific architectures for targeted applications.

Conclusions:

  • RDRP techniques provide superior control for synthesizing advanced hydrogels compared to conventional methods.
  • Hydrogels with controlled architectures are key for developing self-healing, multi-responsive, and bioactive materials.
  • Continued research in RDRP-based hydrogel synthesis promises innovative solutions in various scientific fields.