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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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...

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Sacrificial-post templating method for block copolymer self-assembly.

Amir K G Tavakkoli1, Samuel M Nicaise, Adam F Hannon

  • 1Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; NUS Graduate School for Integrative Sciences & Engineering (NGS), 117456, Singapore.

Small (Weinheim an Der Bergstrasse, Germany)
|July 11, 2013
PubMed
Summary
This summary is machine-generated.

A novel sacrificial-post templating method enables precise control over block copolymer self-assembly, creating diverse nanostructures like perforated lamellae. This technique allows for tunable pore sizes in the resulting nanoscale patterns.

Keywords:
block copolymernanostructuressacrificial-post templateself-assemblysquare lattices

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Block copolymers self-assemble into ordered nanostructures.
  • Topographical templates are often used to direct this self-assembly.
  • Existing templating methods can incorporate the template into the final pattern.

Purpose of the Study:

  • To develop a sacrificial-post templating method for block copolymer self-assembly.
  • To create nanostructures with monolayers and bilayers of microdomains.
  • To produce arrays of nanoscale holes with controlled shapes and symmetries.

Main Methods:

  • Utilizing a sacrificial-post topographical template.
  • Directing block copolymer self-assembly on the template.
  • Removing the template after self-assembly to avoid incorporation.
  • Varying template pitch to control feature dimensions.

Main Results:

  • Formation of nanostructures including monolayers and bilayers of microdomains.
  • Production of arrays of nanoscale holes with diverse shapes and symmetries.
  • Generation of mesh structures and perforated lamellae.
  • Achieved bimodal pore size distributions with tunable ratios, consistent with self-consistent field theory predictions.

Conclusions:

  • The sacrificial-post templating method effectively directs block copolymer self-assembly into complex nanostructures.
  • This approach allows for the creation of tunable nanoscale patterns without template incorporation.
  • The method offers precise control over feature size and symmetry, validated by theoretical predictions.