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Related Concept Videos

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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Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

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Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
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Electrochemical Systems01:24

Electrochemical Systems

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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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The Colloidal State01:29

The Colloidal State

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Ostwald’s Dilution Law01:25

Ostwald’s Dilution Law

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Consider a binary electrolyte AB with a concentration ‘c’ that reversibly dissociates into its constituent ions. The degree of this dissociation is represented by ⍺. This means that the equilibrium concentration of each ionic species can be expressed as ⍺c. As well as this, the fraction of the electrolyte that remains undissociated at equilibrium is given by (1−⍺). The corresponding equilibrium concentration for this undissociated portion is then calculated...
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The Electrical Double Layer01:30

The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Gel phase formation in dilute triblock copolyelectrolyte complexes.

Samanvaya Srivastava1,2, Marat Andreev1, Adam E Levi1

  • 1Institute for Molecular Engineering, The University of Chicago, Chicago, Illinois 60637, USA.

Nature Communications
|February 24, 2017
PubMed
Summary
This summary is machine-generated.

Triblock copolyelectrolytes form gels almost instantly upon solvation, unlike uncharged polymers. This unique assembly pathway, driven by polyelectrolyte complexation, enables gel formation at very low concentrations.

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Physical Chemistry

Background:

  • Uncharged amphiphilic block copolymers form discrete micelles at low concentrations.
  • Assembly of charged triblock copolyelectrolytes into gels has been observed experimentally and computationally.
  • Understanding the assembly pathways of complex polymer systems is crucial for materials design.

Purpose of the Study:

  • To investigate the assembly mechanism of triblock copolyelectrolytes driven by polyelectrolyte complexation.
  • To contrast the assembly behavior of charged triblock copolyelectrolytes with uncharged block copolymers.
  • To elucidate the role of oligo-chain aggregates in early-stage assembly.

Main Methods:

  • Scattering experiments
  • Molecular dynamics simulations
  • Analysis of self-assembly pathways

Main Results:

  • Polyelectrolyte complexation prevents the formation of a dilute phase of individual micelles.
  • Gel phases form and phase separate almost instantaneously upon solvation.
  • Molecular models reveal oligo-chain aggregates at unobservable low concentrations.

Conclusions:

  • The assembly of triblock copolyelectrolytes is fundamentally different from uncharged block copolymers.
  • Instantaneous gel formation at low concentrations is a key characteristic of polyelectrolyte complexation-driven assembly.
  • These findings have potential applications in tissue engineering, agriculture, water purification, and theranostics.