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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 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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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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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: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Synthesis and Characterization of Supramolecular Colloids
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Multi-mode supermolecular polymerization driven by host-guest interactions.

Dongdong Chang1, Dan Han1, Wenhao Yan1

  • 1Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science & Technology Shanghai 200237 PR China zoulei@ecust.edu.cn +86 21 64252288 +86 21 64252758.

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|May 11, 2022
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Summary
This summary is machine-generated.

This study demonstrates supramolecular polymerization using cucurbit[8]uril (CB[8]) and guest molecules to create linear and dendritic polymers. This host-guest assembly also facilitates azobenzene isomerization, leading to stable structures without isomerism upon UV light exposure.

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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science
  • Materials Chemistry

Background:

  • Supramolecular polymers offer tunable properties through non-covalent interactions.
  • Controlling polymer architecture (linear vs. dendritic) is crucial for material function.
  • Host-guest chemistry provides a powerful platform for constructing complex supramolecular systems.

Purpose of the Study:

  • To develop a novel supramolecular self-assembly for constructing linear and dendritic polymers.
  • To investigate the influence of azobenzene incorporation on polymer morphology and properties.
  • To explore the use of host-guest interactions for controlled isomerization of azobenzene.

Main Methods:

  • Ternary host-guest complexation involving cucurbit[8]uril (CB[8]), 1,1'-dimethyl-4,4'-bipyridinium dication (MV), and coumarin derivatives.
  • Synthesis of ABBA type monomers with azobenzene units.
  • Characterization using 1H NMR spectroscopy, ROESY, transmission electron microscopy (TEM), and dynamic light scattering (DLS).

Main Results:

  • Successful construction of linear supramolecular polymers with a high degree of polymerization in aqueous solution.
  • Introduction of azobenzene led to a morphological transition from linear to dendritic polymers.
  • Demonstrated non-covalent host-guest molecular recognition for both linear and dendritic supramolecular polymer formation.
  • Supramolecular polymerization promoted cis-to-trans conversion of azobenzene, resulting in isomerically stable structures upon UV irradiation.

Conclusions:

  • A novel host-guest system enables the formation of tunable linear and dendritic supramolecular polymers.
  • Azobenzene incorporation provides a mechanism for morphological control and photo-responsiveness.
  • The developed supramolecular polymerization strategy offers a pathway to photo-stable materials via controlled isomerization.