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Cationic Chain-Growth Polymerization: Mechanism00:57

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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.
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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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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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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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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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Amino Acid Polymerization on Silica Surfaces.

Ola El Samrout1, Gloria Berlier1, Jean-François Lambert2

  • 1Department of Chemistry, University of Torino, Via P. Giuria 7, 10125, Torino, Italy.

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Summary

Silica promotes amino acid polymerization for industrial and prebiotic chemistry. This review clarifies silica

Keywords:
amino acidcyclic dimerlinear peptidespolymerizationsilica

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Area of Science:

  • Chemistry
  • Biochemistry
  • Materials Science

Background:

  • Amino acid (AA) polymerization is vital for industrial medicinal and prebiotic chemistry.
  • Silica is a cost-effective and abundant promoter for amide/peptide bond synthesis.
  • Current understanding of silica-mediated AA polymerization mechanisms, surface interactions, and reaction selectivity is limited.

Purpose of the Study:

  • To review and rationalize experimental and modeling data on silica-promoted amino acid polymerization.
  • To elucidate the influence of silica surface properties and AA deposition on polymerization outcomes.
  • To explore the role of water and reaction selectivity in AA condensation.

Main Methods:

  • Literature review of experimental and computational studies on silica-amino acid interactions.
  • Analysis of silica surface site types and macroscopic features.
  • Discussion of AA deposition procedures and adsorption mechanisms (covalent grafting, H-bonding).

Main Results:

  • AA adsorption mechanisms on silica are dictated by silanol type and density.
  • Adsorption influences the formation of cyclic dimers versus linear peptide chains.
  • Evidence suggests polymerization selectivity in multi-AA systems and secondary structure formation.

Conclusions:

  • Silica's surface chemistry critically controls amino acid adsorption and subsequent polymerization.
  • Understanding these interactions is key to controlling polymerization products and selectivity.
  • Further research can leverage silica for controlled peptide synthesis and prebiotic chemistry.