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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 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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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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Anionic Polymerization Using Flow Microreactors.

Yusuke Takahashi1, Aiichiro Nagaki2

  • 1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan. takahashiy@sbchem.kyoto-u.ac.jp.

Molecules (Basel, Switzerland)
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PubMed
Summary
This summary is machine-generated.

Flow microreactors are revolutionizing polymer synthesis. This review focuses on their application in anionic polymerization, highlighting new possibilities and diverse uses in this field.

Keywords:
alkyl methacrylateanionic polymerizationblock copolymerend functionalized polymerflow synthesisstyrene

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Area of Science:

  • Polymer Chemistry
  • Chemical Engineering
  • Materials Science

Background:

  • Flow microreactors offer advanced control over chemical reactions.
  • Polymer synthesis benefits from precise reaction conditions achievable in microreactors.
  • Anionic polymerization is a key area for exploring microreactor technology.

Purpose of the Study:

  • To provide a comprehensive overview of flow microreactors in anionic polymerization.
  • To explore the potential and applications of microreactors in this specific polymerization technique.

Main Methods:

  • Review of existing literature on flow microreactors and anionic polymerization.
  • Analysis of studies demonstrating microreactor applications in various polymerization types.

Main Results:

  • Flow microreactors enable enhanced control over anionic polymerization processes.
  • Microreactors open new avenues for polymer synthesis with improved characteristics.
  • Diverse applications of flow microreactors in anionic polymerization are identified.

Conclusions:

  • Flow microreactors represent a significant advancement for anionic polymerization.
  • The technology facilitates novel polymer architectures and controlled synthesis.
  • Further exploration of microreactor applications in polymer chemistry is warranted.