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Related Concept Videos

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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.8K
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,...
2.8K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

3.0K
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...
3.0K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

4.3K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

3.0K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
3.0K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.7K
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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Progress in Conducting Polymers: Synthesis, Stability, and Ionic/Electronic Transport Properties.

Houji Cai1, Yuanying Liang1, Qichao Zhang1

  • 1Institute of Polymer Optoelectronic Materials and Devices, Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, China.

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Conducting polymers combine polymer flexibility with electrical conductivity. This review details their synthesis, doping, stability, and conduction mechanisms for advanced electronic applications.

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conducting polymerdopingionic‐electronic couplingstabilitysynthesis

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Condensed Matter Physics

Background:

  • Conducting polymers (CPs) offer a unique blend of polymer processability and electrical conductivity, bridging organic and inorganic materials.
  • Advancements in solution-processable CPs enable cost-effective, large-area, and flexible electronic and optoelectronic devices.
  • Polyacetylene's discovery initiated significant interest in CPs for diverse technological applications.

Purpose of the Study:

  • To provide a comprehensive review of fundamental and applied aspects of conducting polymers.
  • To elucidate synthesis, doping mechanisms, stability, and conduction pathways in CPs.
  • To discuss current advancements and future perspectives in CP development for electronic applications.

Main Methods:

  • Literature review of synthesis, doping (p-type, n-type, photo-induced), stability enhancement strategies.
  • Analysis of charge transport mechanisms, including polarons, bipolarons, and counter-ion movement.
  • Exploration of intrachain and interchain conductivity factors.

Main Results:

  • Doping is critical for CP conductivity, with various strategies enhancing performance.
  • CPs exhibit environmental and operational stability challenges, but durability can be improved.
  • Conduction involves complex charge carrier dynamics and transport pathways influencing conductivity.

Conclusions:

  • Conducting polymers are versatile materials with significant potential in flexible electronics.
  • Understanding doping, stability, and conduction mechanisms is key to optimizing CP performance.
  • Further research into CP development promises innovative solutions for next-generation devices.