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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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...
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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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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...
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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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

Cationic Chain-Growth Polymerization: Mechanism

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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...
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Nanoparticle-regulated phase behavior of ordered block copolymers.

Michelle K Gaines1, Steven D Smith2, Jon Samseth3

  • 1Department of Materials Science & Engineering, North Carolina State University, Raleigh, NC 27695, USA.

Soft Matter
|September 10, 2020
PubMed
Summary
This summary is machine-generated.

Nanoparticle size and selectivity stabilize block copolymer nanostructures. This stabilization is achieved by increasing the order-disorder transition temperature, enhancing material order and performance.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Block copolymers are widely used as supramolecular templates for inorganic nanoparticles.
  • Understanding the interplay between nanoparticles and copolymer structures is crucial for advanced materials design.

Purpose of the Study:

  • To experimentally confirm and theoretically support the role of nanoparticle characteristics in stabilizing diblock copolymer nanostructures.
  • To investigate how nanoparticle size and selectivity influence the order-disorder transition temperature of copolymer systems.

Main Methods:

  • Experimental synthesis and characterization of diblock copolymers containing inorganic nanoparticles.
  • Theoretical modeling using a hybrid self-consistent field/density functional theory approach.

Main Results:

  • Experimental data confirmed that nanoparticle size and selectivity significantly stabilize the copolymer nanostructure.
  • Theoretical predictions supported the experimental findings, demonstrating increased order-disorder transition temperatures with controlled nanoparticle properties.

Conclusions:

  • Nanoparticle size and selectivity are key parameters for stabilizing block copolymer nanostructures.
  • This stabilization effect, mediated by an increased order-disorder transition temperature, offers a new pathway for designing ordered nanomaterials.