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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
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

Step-Growth Polymerization: Overview

3.6K
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...
3.6K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
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...
2.1K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.8K
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...
2.8K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.5K
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...
3.5K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.0K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
2.0K

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Related Experiment Video

Updated: Sep 16, 2025

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Versatile Halide-Pair-Driven Multicomponent Polymerization for Library Synthesis of Sequence-Controlled

Hae-Nam Choi1, Su-Min Ko1, Semin Son1

  • 1Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea.

Angewandte Chemie (International Ed. in English)
|July 10, 2025
PubMed
Summary
This summary is machine-generated.

We developed a new polymerization method for sequence-controlled semiconducting polymers. This strategy allows for diverse and precisely sequenced poly(triarylamine)s, advancing organic electronics.

Keywords:
Alternating poly(triarylamine)sCascade Buchwald–Hartwig aminationDendronized semiconducting polymersLibrary synthesisMulticomponent polymerization

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Area of Science:

  • Organic electronics
  • Polymer chemistry
  • Materials science

Background:

  • Sequence-controlled semiconducting polymers are crucial for advanced organic electronic devices.
  • Current synthetic methods struggle to achieve both high sequence fidelity and structural diversity.

Purpose of the Study:

  • To introduce a novel multicomponent polymerization (MCP) strategy for synthesizing sequence-controlled semiconducting poly(triarylamine)s (PTAAs).
  • To enable library synthesis of PTAAs with precise molecular sequences and structural diversity.

Main Methods:

  • Utilized a halide-pair-driven multicomponent polymerization (MCP) approach.
  • Optimized halide pairing and employed a Buchwald ligand-Pd system with catalyst-transfer capability for sequential cascade aminations.

Main Results:

  • Successfully synthesized a library of sequence-controlled poly(triarylamine)s (PTAAs).
  • Demonstrated the versatility of the MCP strategy, including the synthesis of dendronized variants.
  • Achieved efficient sequential cascade aminations crucial for precise sequence control.

Conclusions:

  • The developed halide-pair-driven MCP strategy is a versatile platform for discovering functional semiconducting materials.
  • This method overcomes limitations in synthesizing sequence-controlled polymers, paving the way for novel organic electronic applications.