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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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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 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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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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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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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Crosslinked polymer nanoparticles containing single conjugated polymer chains.

Rodrigo A Ponzio1, Yésica L Marcato, María L Gómez

  • 1Departamento de Química, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Río Cuarto, Córdoba, Argentina. Departamento de Física, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Río Cuarto, Córdoba, Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA), Argentina.

Methods and Applications in Fluorescence
|March 30, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed novel fluorescent crosslinked nanoparticles by combining conjugated polymers with crosslinked polymers. These F8BT@pEGDMA nanoparticles exhibit enhanced structural rigidity and enable single-particle detection for advanced nanosensor applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Conjugated polymer nanoparticles offer advantages in fluorescent labeling and sensing due to their photophysical properties and suitability for single-particle detection.
  • Highly crosslinked polymers provide structural integrity and solvent resistance, crucial for robust nanomaterials.
  • Combining these polymer types in nanoparticles opens avenues for advanced applications leveraging both properties.

Purpose of the Study:

  • To synthesize and characterize novel F8BT@pEGDMA nanoparticles, integrating a conjugated polymer (F8BT) within a crosslinked polymer matrix (pEGDMA).
  • To evaluate the photophysical properties and structural integrity of these hybrid nanoparticles.
  • To assess their potential for high-resolution nanosensing applications.

Main Methods:

  • Microemulsion polymerization was employed to synthesize F8BT@pEGDMA nanoparticles.
  • Characterization involved photophysical evaluations and size distribution analysis.
  • Single-particle fluorescence microscopy techniques were utilized for detailed assessment.

Main Results:

  • F8BT@pEGDMA nanoparticles were successfully synthesized with nanosized dimensions and a yield of approximately 25%.
  • The crosslinking process imparted significant structural rigidity, making the nanoparticles resistant to dissolution in organic solvents.
  • The nanoparticles, largely containing single F8BT chains, were detectable at the single-particle level via fluorescence microscopy.

Conclusions:

  • The synthesized fluorescent crosslinked nanoparticles demonstrate excellent structural stability and single-particle detectability.
  • These F8BT@pEGDMA nanoparticles show significant promise for applications as molecularly imprinted polymer fluorescent nanosensors.
  • The high spatial and temporal resolution achievable with these nanoparticles is well-suited for advanced sensing technologies.