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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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Anionic Chain-Growth Polymerization: Mechanism01:04

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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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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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Self-healing polymer materials constructed by macrocycle-based host-guest interactions.

Xianpeng Yang1, Haojie Yu, Li Wang

  • 1State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China. opl_wl@dial.zju.edu.cn hjyu@zju.edu.cn.

Soft Matter
|January 24, 2015
PubMed
Summary
This summary is machine-generated.

Self-healing polymers utilize macrocycle-based host-guest interactions for enhanced material longevity. This review highlights recent advancements in cyclodextrins, crown ethers, and other macrocycles for self-healing applications.

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Area of Science:

  • Polymer Science and Materials Chemistry

Background:

  • Self-healing polymers offer extended material lifespans by autonomously repairing damage.
  • Macrocycle-based host-guest interactions are fundamental to fabricating effective self-healing materials.

Purpose of the Study:

  • To review recent progress in self-healing polymers utilizing macrocyclic host-guest chemistry.
  • To focus on specific macrocycles like cyclodextrins, crown ethers, cucurbit[n]urils, calix[n]arenes, and pillar[n]arenes.

Main Methods:

  • Literature review of recent advancements in self-healing polymer materials.
  • Focus on macrocycles with tailored structures and specific guest groups.

Main Results:

  • Highlighting the critical role of various macrocycles (cyclodextrins, crown ethers, cucurbit[n]urils, calix[n]arenes, pillar[n]arenes) in self-healing polymer design.
  • Demonstrating how tailored structures and guest groups enhance self-healing capabilities.

Conclusions:

  • Self-healing polymers based on macrocycle-guest interactions represent a significant advancement in materials science.
  • Future research should explore novel macrocyclic designs and applications for improved material durability and functionality.