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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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 catalyst, high molecular...
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 generated carbocation,...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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 acceptor.
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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...
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...
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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Hierarchical Mesoscale Trapping Controls Pathway Selection in Supramolecular Polymerization.

Ziyuan Li1, Rongzhou Du2, Yun Huang1

  • 1School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui, P. R. China.

Angewandte Chemie (International Ed. in English)
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Summary

Hierarchical mesoscale aggregation controls supramolecular polymerization pathways. Mesoscale clusters trap metastable assemblies, delaying conversion to fibers and enabling pathway switching via temperature.

Keywords:
aggregation mesoscale trappinghierarchicalpathway complexitysmall angle X‐ray scatteringsupramolecular polymerization

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Polymer chemistry

Background:

  • Supramolecular polymerization involves competing kinetic and thermodynamic pathways.
  • Pathway selection is often linked to molecular packing, but higher-order organization's role is less understood.

Purpose of the Study:

  • To investigate how hierarchical mesoscale aggregation influences pathway selection in supramolecular polymerization.
  • To explore emergent regulatory mechanisms beyond molecular scale organization.

Main Methods:

  • Utilized a donor-acceptor dicyanostilbene derivative.
  • Employed time-resolved small-angle X-ray scattering and spectroscopy.
  • Analyzed aggregate formation and assembly dynamics under concentrated conditions.

Main Results:

  • Identified two primary aggregates that form mesoscale structures.
  • Demonstrated that mesoscale clusters transiently trap metastable assemblies.
  • Showed that increasing temperature releases assemblies from the mesoscale trap, switching the pathway.

Conclusions:

  • Hierarchical mesoscale aggregation acts as a kinetic regulatory mechanism in supramolecular polymerization.
  • Mesoscale trapping influences the kinetics of assembly, controlling the final structure.
  • This provides a new perspective on controlling supramolecular material formation.