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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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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...
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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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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Structuring polymer gels via catalytic reactions.

Virginie Hugouvieux1, Walter Kob

  • 1SPO, INRA, Montpellier SupAgro, University of Montpellier, 34060 Montpellier, France. virginie.hugouvieux@inra.fr.

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Summary
This summary is machine-generated.

Computer simulations show catalytic reactions in polymer solutions can create physical gels with unique cluster phases. This process, unlike temperature-induced gelation, results in regular mesostructures dependent on reaction conditions.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Homopolymer solutions typically form gels via temperature changes (quench).
  • Catalytic reactions can alter monomer properties, potentially influencing solution structure.
  • Understanding gel formation mechanisms is crucial for designing novel materials.

Purpose of the Study:

  • To investigate the formation of polymer gels induced by catalytic reactions in a polymer sol.
  • To characterize the mesostructure of these catalytically formed gels.
  • To explore the influence of reaction parameters on gel formation and structure.

Main Methods:

  • Computer simulations of polymer solutions with catalytic monomers.
  • Modeling catalyst-induced conversion of repulsive A monomers to attractive B monomers.
  • Analysis of mesostructure formation, dependence on parameters (catalyst concentration, temperature, polymer density), and dynamics.

Main Results:

  • Catalytic reactions transform polymer solutions into physical gels with regular cluster-phase mesostructures at low temperatures.
  • This mesostructure differs significantly from gels formed by temperature quenches.
  • Gel structuring depends on catalyst concentration, temperature, and polymer density, with dynamics predictable via interaction potentials.
  • Observed structuring is influenced by both chemical distribution and its formation mode.

Conclusions:

  • Catalytic reactions offer a novel pathway to form polymer gels with unique, regular mesostructures.
  • The formation and characteristics of these gels are controllable via reaction parameters.
  • Simulation results align with theoretical predictions for spinodal lines and copolymer phase behavior.