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Related Concept Videos

Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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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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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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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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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...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
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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Updated: Aug 8, 2025

Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes

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Bioinspired crowding directs supramolecular polymerisation.

Nils Bäumer1, Eduardo Castellanos2, Bartolome Soberats2

  • 1Westfälische-Wilhelms Universität Münster, Organisch Chemisches Institut, Corrensstraße 36, 48149, Münster, Germany.

Nature Communications
|February 25, 2023
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Summary
This summary is machine-generated.

Crowding effects significantly influence supramolecular polymerization, transforming fiber structures into flower-like assemblies. This highlights the underappreciated role of crowding in artificial self-assembly systems.

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Area of Science:

  • Supramolecular Polymer Science
  • Materials Chemistry
  • Chemical Engineering

Background:

  • Crowding effects are vital for biological system functionality but largely unexplored in artificial systems.
  • The role of crowding in supramolecular polymer science remains underappreciated.
  • Understanding crowding is key to controlling self-assembly processes.

Purpose of the Study:

  • To investigate the impact of crowding effects on supramolecular polymerization kinetics, pathways, and outcomes.
  • To demonstrate how crowding agents can direct self-assembly towards novel morphologies.
  • To explore the potential of crowding in designing advanced supramolecular materials.

Main Methods:

  • Utilizing a model supramolecular polymer system.
  • Introducing a pre-formed supramolecular polymer as a crowding agent.
  • Analyzing morphological changes using microscopy and other characterization techniques.

Main Results:

  • Crowding effects exert strong control over supramolecular polymerization dynamics and final structures.
  • A model supramolecular polymer transformed from bundled fibers to flower-like hierarchical assemblies in a crowded environment.
  • This morphological transformation was dependent on the crowding agent's one-dimensional morphology and the crowded conditions, with no co-assembly observed.

Conclusions:

  • Crowding effects are a powerful tool for controlling supramolecular self-assembly and accessing diverse morphologies.
  • The findings reveal a new pathway for supramolecular polymer formation driven by crowding.
  • This research enhances the understanding of high-precision self-assembly, with implications for both artificial and natural systems.