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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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Step-Growth Polymerization: Overview01:03

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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...
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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

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Phase Behavior of Ternary Polymer Brushes.

Chester K Simocko1, Amalie L Frischknecht1, Dale L Huber1

  • 1Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States.

ACS Macro Letters
|June 7, 2022
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Summary
This summary is machine-generated.

Ternary polymer brushes phase separate into distinct domains, with behavior predictable by self-consistent field theory. Composition tuning allows control over these complex polymer brush structures.

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Area of Science:

  • Polymer Science
  • Materials Chemistry

Background:

  • Polymer brushes are versatile surface coatings.
  • Controlling phase separation in multicomponent polymer systems is challenging.

Purpose of the Study:

  • To synthesize and characterize ternary polymer brushes.
  • To investigate the lateral phase separation behavior.
  • To model the phase behavior using self-consistent field theory.

Main Methods:

  • Synthesis of ternary polymer brushes (polystyrene, poly(methyl methacrylate), poly(4-vinylpyridine)).
  • Experimental characterization of phase separation.
  • Self-consistent field theory modeling.

Main Results:

  • Ternary polymer brushes exhibit lateral phase separation into multiple distinct domains.
  • Phase behavior is tunable by adjusting the relative polymer composition.
  • Self-consistent field theory accurately predicts the observed phase diagram and behavior.

Conclusions:

  • The synthesis of ternary polymer brushes offers tunable phase separation.
  • Self-consistent field theory is a reliable tool for predicting polymer brush morphology.
  • Compositional control is key to designing complex polymer brush architectures.