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Related Concept Videos

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...

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Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles
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Flexible particle array structures by controlling polymer graft architecture.

Jihoon Choi1, Hongchen Dong, Krzysztof Matyjaszewski

  • 1Department of Materials Science and Engineering, 5000 Forbes Avenue, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.

Journal of the American Chemical Society
|August 24, 2010
PubMed
Summary
This summary is machine-generated.

Synthesizing particle brushes using surface-initiated atom-transfer radical polymerization creates ordered arrays. These arrays exhibit enhanced toughness and flexibility due to polymer-like crazing from entangled chains.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Particle brushes are assemblies of polymer chains grafted to particle surfaces.
  • Controlling chain conformation is crucial for tuning material properties.
  • Atom-transfer radical polymerization (ATRP) is a versatile technique for polymer synthesis.

Purpose of the Study:

  • To synthesize particle brushes with controlled chain conformations using surface-initiated ATRP.
  • To investigate the relationship between chain conformation and the mechanical properties of particle assemblies.
  • To understand the fracture mechanisms in semidilute polymer brush systems.

Main Methods:

  • Surface-initiated atom-transfer radical polymerization (ATRP) was employed.
  • Particle brushes were synthesized with varying fractions of extended and relaxed chains.
  • Mechanical properties and fracture behavior of particle arrays were analyzed.

Main Results:

  • Controlled synthesis of particle brushes with tunable chain conformations was achieved.
  • Ordered, plastic-compliant particle array structures were formed in the semidilute brush limit.
  • Chain entanglements induced polymer-like crazing, significantly enhancing toughness and flexibility.

Conclusions:

  • Surface-initiated ATRP enables precise control over particle brush architecture.
  • Entangled polymer chains in particle assemblies lead to unique toughening mechanisms.
  • These findings offer pathways for designing robust and flexible particle-based materials.