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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

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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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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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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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Step-Growth Polymerization: Overview01:03

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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.
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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...
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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
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Developing conjugated polymers with high electron affinity by replacing a C-C unit with a B←N unit.

Chuandong Dou1, Zicheng Ding, Zijian Zhang

  • 1State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P. R. China).

Angewandte Chemie (International Ed. in English)
|February 14, 2015
PubMed
Summary

Researchers developed a new method to lower conjugated polymer energy levels by replacing carbon-carbon units with boron-nitrogen units. This strategy effectively reduces both LUMO and HOMO levels, creating polymers with high electron affinity for optoelectronic devices.

Keywords:
boronconjugationelectron transportfluorescencepolymers

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Polymer Science

Background:

  • Key parameters for conjugated polymers include lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) energy levels.
  • Simultaneously lowering LUMO and HOMO energy levels significantly (>0.5 eV) in conjugated polymers is challenging.

Purpose of the Study:

  • To introduce a novel strategy for substantially decreasing LUMO and HOMO energy levels in conjugated polymers.
  • To explore the use of boron-nitrogen units as a replacement for carbon-carbon units to tune polymer properties.

Main Methods:

  • Synthesized conjugated polymers by replacing C-C units with B←N units.
  • Utilized fluorescence quenching experiments to verify changes in electronic properties.
  • Assessed photovoltaic response to confirm the transformation from electron donor to acceptor.

Main Results:

  • Achieved a significant reduction of approximately 0.6 eV in both LUMO and HOMO energy levels.
  • Demonstrated the transformation of the polymer from an electron donor to an electron acceptor.
  • Confirmed the effectiveness of the B←N unit substitution through experimental evidence.

Conclusions:

  • The B←N unit substitution offers an effective approach to tune LUMO/HOMO energy levels in conjugated polymers.
  • Organic boron chemistry provides a new avenue for developing conjugated polymers with high electron affinity.
  • This method is promising for advancing polymer optoelectronic devices.