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Related Concept Videos

Crown Ethers02:36

Crown Ethers

5.6K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
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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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
38.0K
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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Dehydration Synthesis01:15

Dehydration Synthesis

146.1K
Overview
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Crown Ether-Based Supramolecular Polymers: From Synthesis to Self-Assembly.

Zhaozhao Duan1, Fenfen Xu1, Xiaohui Huang1

  • 1Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, P. R. China.

Macromolecular Rapid Communications
|December 9, 2021
PubMed
Summary

Crown ether-based supramolecular polymers (CSPs) are constructed using host-guest interactions. This review details CSP preparation, recognition pairs, structures, and properties for advanced material applications.

Keywords:
crown ethershost-guest recognitionsself-assemblysupramolecular polymers

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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science

Background:

  • Supramolecular polymers offer unique advantages over traditional polymers.
  • Noncovalent interactions, particularly host-guest interactions, are key to their construction.
  • Crown ethers are foundational macrocyclic hosts in supramolecular chemistry.

Purpose of the Study:

  • To review the preparation of crown ether-based supramolecular polymers (CSPs).
  • To summarize CSPs' recognition pairs, organization, structures, and properties.
  • To highlight the potential of CSPs in advanced material applications.

Main Methods:

  • Review of existing literature on crown ether-based supramolecular polymers.
  • Classification of host-guest recognition motifs including crown ethers.
  • Analysis of functionalization and self-assembly strategies for CSPs.

Main Results:

  • Crown ethers, due to their modifiable nature, are ideal for creating functional supramolecular polymers.
  • Various crown ether derivatives enable diverse supramolecular polymer architectures.
  • CSPs exhibit tunable properties and stimuli-responsiveness.

Conclusions:

  • Crown ether-based supramolecular polymers represent a significant advancement in materials science.
  • Their versatile construction and tunable properties offer broad application potential.
  • Further research into CSPs will drive innovation in functional materials.