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Related Concept Videos

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
Surface Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Adsorption Isotherms I01:29

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...
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...
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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The extent of the...

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Related Experiment Video

Updated: Jul 16, 2026

Preparation of Poly(pentafluorophenyl acrylate) Functionalized SiO2 Beads for Protein Purification
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Preparation of Poly(pentafluorophenyl acrylate) Functionalized SiO2 Beads for Protein Purification

Published on: November 19, 2018

Aggregation, adsorption, and surface properties of multiply end-functionalized polystyrenes.

Imtiyaz A Ansari1, Nigel Clarke, Lian R Hutchings

  • 1Department of Chemistry, Durham University, Science Site, South Road, Durham, DH1 3LE, U.K. and ISIS Facility, CCLRC Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U.K.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 21, 2007
PubMed
Summary

Fluorocarbon-functionalized polystyrene blends exhibit surfactant-like behavior, spontaneously adsorbing to surfaces and reducing surface energy. Their aggregation and surface properties depend on the number of functional groups and blend concentration.

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Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness
11:09

Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness

Published on: April 1, 2018

Area of Science:

  • Polymer Science
  • Materials Science
  • Surface Chemistry

Background:

  • Polystyrene blends with functionalized polymers can mimic surfactant behavior.
  • Understanding polymer adsorption and aggregation is crucial for materials design.

Purpose of the Study:

  • To investigate the surface and bulk properties of polystyrene blends containing fluorocarbon-functionalized polystyrene.
  • To correlate polymer structure with adsorption, aggregation, and surface energy reduction.

Main Methods:

  • Nuclear reaction analysis (NRA) for surface adsorption.
  • Contact angle analysis for surface energy.
  • Small-angle neutron scattering (SANS) for bulk aggregation.
  • Neutron reflectometry (NR) for adsorbed layer structure.

Main Results:

  • Functionalized polystyrene (FxdPSy) spontaneously adsorbs to surfaces, lowering surface energy.
  • Aggregation behavior is sensitive to FxdPSy structure; F2dPS10 forms small micelles, F4dPS10 forms multilamellar vesicles.
  • Adsorbed layer thickness correlates with bulk aggregate structure and is predicted by SCFT models.

Conclusions:

  • Fluorocarbon-functionalized polystyrene acts as a surfactant in blends, driving surface activity and aggregation.
  • The number of fluorocarbon groups significantly impacts aggregation morphology and surface energy.
  • These findings offer insights into designing functional polymer materials for surface modification.