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Related Concept Videos

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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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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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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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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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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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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Defect-Free Alternating Conjugated Polymers Enabled by Room- Temperature Stille Polymerization.

Bowei Ma1, Qinqin Shi1, Xiaoying Ma2

  • 1College of Materials Science and Opto-Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

Angewandte Chemie (International Ed. in English)
|January 31, 2022
PubMed
Summary

A new room-temperature Stille polymerization method avoids defects in donor-acceptor π-conjugated polymers. This leads to improved quality and higher performance in organic electronics, specifically organic field-effect transistors (OFETs).

Keywords:
Alternating Conjugated PolymersBuchwald PrecatalystHomocoupling DefectsRoom-Temperature ReactionsStille Cross-Coupling Polymerization

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Stille cross-coupling polymerization is vital for synthesizing donor-acceptor (D-A) π-conjugated polymers (CPs).
  • Conventional thermal-activation Stille polymerization often introduces homocoupling defects, impacting copolymer quality and device performance in optoelectronics.
  • These defects lead to batch-to-batch variations and reduced efficiency in electronic devices.

Purpose of the Study:

  • To develop a room-temperature Stille-type polymerization method.
  • To demonstrate the method's utility and generality in synthesizing D-A CPs.
  • To eliminate homocoupling defects and improve the performance of organic electronic devices.

Main Methods:

  • A novel room-temperature Stille-type polymerization protocol was established.
  • The method was applied to synthesize twelve different D-A CPs, achieving high molecular weights.
  • Comparative studies were conducted using thermal-activation Stille polymerization to identify structural differences.

Main Results:

  • The room-temperature method successfully synthesized twelve D-A CPs with high molecular weights.
  • Crucially, the synthesized copolymers exhibited no homocoupling (hc) structural defects.
  • Organic field-effect transistors (OFETs) fabricated from these defect-free polymers showed twofold higher charge transport mobility (2.10 cm² V⁻¹ s⁻¹).

Conclusions:

  • The developed room-temperature Stille-type polymerization is a superior alternative to thermal methods for producing high-quality D-A CPs.
  • Elimination of homocoupling defects enhances polymer crystallinity and reduces trap density of states (tDOS).
  • This advancement significantly improves the performance of organic field-effect transistors and related optoelectronic applications.