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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

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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

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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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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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Radical Chain-Growth Polymerization: Overview01:10

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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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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Controllable Supramolecular Polymerization through Host-Guest Interaction and Photochemistry.

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Researchers developed a new controllable supramolecular polymerization method using host-guest interactions and photochemistry. This technique precisely controls polymer structure and molecular weight for advanced materials.

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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science
  • Photochemistry

Background:

  • Supramolecular polymerization offers unique material properties but controlling polymer architecture remains challenging.
  • Host-guest interactions and photochemistry are powerful tools for dynamic molecular assembly.

Purpose of the Study:

  • To report a novel method for controllable supramolecular polymerization.
  • To demonstrate precise control over molecular weight and polydispersity of supramolecular polymers.
  • To establish a general methodology for tailoring supramolecular polymer structures.

Main Methods:

  • Utilized an ABBA-type monomer and a cucurbit[8]uril host monomer for host-guest complexation.
  • Employed photochemistry, specifically competitive light irradiation, to modulate azobenzene isomer ratios.
  • Varied the molar ratios of host and guest monomers to influence polymerization outcomes.

Main Results:

  • Achieved well-controlled molecular weight and low polydispersity in supramolecular polymers.
  • Demonstrated that tuning monomer ratios and azobenzene isomer ratios dictates polymer characteristics.
  • Successfully controlled supramolecular polymer structure through photochemical stimuli.

Conclusions:

  • The reported method provides a general and effective strategy for controllable supramolecular polymerization.
  • Precise control over supramolecular polymer structure and molecular weight is achievable.
  • This work advances the design and synthesis of functional supramolecular materials.