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Related Concept Videos

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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.
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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 species into the...

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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
08:07

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Published on: June 18, 2013

Core-shell polymer nanorods by a two-step template wetting process.

S Dougherty1, J Liang

  • 1Mechanical Engineering Department, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA.

Nanotechnology
|July 2, 2009
PubMed
Summary
This summary is machine-generated.

A new two-step template wetting process creates polymer core-shell nanowires with tunable shell thickness. This versatile method fabricates nanostructures with potential for diverse applications.

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Procedure for Fabricating Biofunctional Nanofibers
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • One-dimensional core-shell polymer nanowires exhibit significant potential across various applications due to their unique properties.
  • Developing efficient and controllable methods for fabricating these nanostructures is crucial for realizing their full potential.

Purpose of the Study:

  • To introduce and demonstrate a versatile two-step template wetting process for creating two-component polymer core-shell nanowires.
  • To achieve controllable shell thickness in the fabricated polymer nanowires.

Main Methods:

  • A two-step template wetting process involving solution wetting for shell fabrication and melt wetting for core filling.
  • Utilized poly(L-lactic acid) (PLLA) and poly(methyl methacrylate) (PMMA) as model polymers.
  • Analyzed shell thickness based on polymer solution concentration and viscosity, with Transmission Electron Microscopy (TEM) for morphology observation.

Main Results:

  • Successfully fabricated two-component polymer core-shell nanowires using the developed two-step template wetting process.
  • Demonstrated control over shell thickness by varying polymer solution concentration and viscosity.
  • Confirmed the core-shell morphology through TEM analysis.

Conclusions:

  • The two-step template wetting process is a feasible and versatile method for fabricating polymer core-shell nanostructures.
  • This technique provides a platform for future optimization and the incorporation of polymers tailored for specific applications.