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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.6K
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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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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.4K
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,...
2.4K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.3K
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...
2.3K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.1K
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...
4.1K
Ion Exchange01:17

Ion Exchange

871
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Updated: Nov 27, 2025

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Cationic Amphiphilic Alternating Copolymers with Tunable Morphology.

Jingling Zhang1, Xiaoxi Yu2, Bingqian Zheng2

  • 1Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States.

Polymer Chemistry
|December 7, 2020
PubMed
Summary

Ionic amphiphilic copolymers self-assembly was studied. Factors like polymer structure and solvent conditions influence how these materials organize in solution.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Ionic amphiphilic alternating copolymers are advanced materials with tunable properties.
  • Understanding their self-assembly behavior is crucial for designing novel functional materials.

Purpose of the Study:

  • To investigate the key factors influencing the self-assembly of ionic amphiphilic alternating copolymers.
  • To correlate polymer architecture and environmental conditions with self-assembly outcomes.

Main Methods:

  • Small-angle X-ray scattering (SAXS) for nanoscale structure determination.
  • Transmission electron microscopy (TEM) for morphological analysis.
  • Dynamic light scattering (DLS) for size distribution analysis.

Main Results:

  • Self-assembly is sensitive to the degree of polymerization and hydrophobic spacer length.
  • The distance between charged groups and the polymer backbone significantly impacts assembly.
  • Solvent environment and counterion type are critical factors controlling aggregate formation.

Conclusions:

  • Polymer structure and solution conditions are critical determinants of ionic copolymer self-assembly.
  • This research provides fundamental insights for the rational design of self-assembled nanostructures.