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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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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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Polymer Classification: Architecture01:14

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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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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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.
Many natural and synthetic polymers are produced by...
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Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery
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Boron "Doped" Polyacetylenes.

Keda Hu1, Zhen Zhang1, James Burke1

  • 1Department of Chemistry & Chemical Biology, University of New Mexico , MSC03 2060, 1 UNM, Albuquerque, New Mexico 87131, United States.

Journal of the American Chemical Society
|July 27, 2017
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel boron-containing conjugated polymers (CPs) without aromatic backbones. These boron-doped polyacetylenes (BPAs) show enhanced electronic delocalization, opening new avenues for advanced materials.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Conjugated polymers (CPs) are crucial for organic electronics.
  • Incorporating boron into polymer backbones is an emerging strategy to tune electronic properties.
  • Existing boron-containing CPs often rely on aromatic moieties, limiting backbone delocalization.

Purpose of the Study:

  • To synthesize and characterize a new class of main-chain boron-containing conjugated polymers (CPs).
  • To investigate boron-doped polyacetylenes (BPAs) as the first examples of main-chain boron-containing CPs lacking aromatic moieties in the backbone.
  • To understand how cross-conjugated side-chains influence the physical and electronic properties of these novel polymers.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • Absorption and emission spectroscopy
  • Cyclic voltammetry
  • Theoretical calculations
  • Fluoride titration experiments

Main Results:

  • Successful synthesis and characterization of novel main-chain boron-containing conjugated polymers (CPs).
  • Demonstration of boron-doped polyacetylenes (BPAs) as the first non-aromatic main-chain boron-containing CPs.
  • Evidence of enhanced electronic delocalization along the polymer main-chain due to the absence of aromatic units.
  • Detailed understanding of the impact of cross-conjugated side-chains on polymer properties.

Conclusions:

  • The developed boron-doped polyacetylenes (BPAs) represent a significant advancement in main-chain boron-containing conjugated polymers.
  • The absence of aromatic moieties in the polymer backbone enhances electronic delocalization, offering potential for improved electronic performance.
  • This work provides a foundation for designing new boron-containing polymers with tailored properties for advanced applications.