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Related Concept Videos

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.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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...
MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

Sphere-forming diblock copolymers in slit confinement: A dynamic density functional theory study.

Hongge Tan1, Qinggong Song, Xiaohui Niu

  • 1College of Science, Civil Aviation University of China, Tianjin 300300, China. thg@iccas.ac.cn

The Journal of Chemical Physics
|June 11, 2009
PubMed
Summary

Confined sphere-forming diblock copolymers exhibit diverse morphologies beyond bulk structures. Film thickness and surface fields dictate phase transitions and surface reconstruction, revealing complex behaviors in thin films.

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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
08:40

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Published on: April 28, 2014

Area of Science:

  • Polymer Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Diblock copolymers self-assemble into various morphologies.
  • Confinement effects significantly alter self-assembly behavior.
  • Understanding thin film morphologies is crucial for applications.

Purpose of the Study:

  • Investigate sphere-forming diblock copolymer morphologies under confinement.
  • Determine the influence of film thickness and surface fields.
  • Map phase behavior and surface reconstruction.

Main Methods:

  • Mean-field dynamic density functional theory (MF-DDFT).
  • Simulation of diblock copolymers confined between two surfaces.
  • Analysis of phase diagrams and morphological transitions.

Main Results:

  • Observed morphologies deviating from bulk spheres, including perpendicular/parallel cylinders, perforated lamellae, and lamellae.
  • Identified phase transitions driven by film thickness and surface field strength.
  • Constructed a phase diagram for surface reconstruction, showing novel phase transitions.

Conclusions:

  • Confinement and surface interactions dramatically influence copolymer morphologies.
  • MF-DDFT effectively predicts complex phase behavior in confined systems.
  • Comparison with cylinder-forming systems highlights unique aspects of sphere-forming copolymers.