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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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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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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Alkyne-rich patchy polymer colloids prepared by surfactant-free emulsion polymerization.

Eva C Morgenthaler1, Alexander E Ribbe1, Laura C Bradley1

  • 1Polymer Science & Engineering Department, 120 Governors Drive, University of Massachusetts, Amherst, MA, 01003.

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|October 25, 2024
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Surfactant-free emulsion polymerization yields functional polymer nanoparticles without traditional surfactants. This method produces tunable particles for click chemistry and reveals insights into phase separation during synthesis.

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Azide-alkyne cycloadditionPolymer colloidsSurfactant-free emulsion polymerization

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Free radical polymerization is common for sub-micron polymer particles.
  • Conventional methods often require surfactants, which can be undesirable.
  • Surfactant-free emulsion polymerization (SFEP) offers a potential alternative for functional particle synthesis.

Purpose of the Study:

  • To evaluate the effectiveness of SFEP for preparing functional polymer particles.
  • To investigate the influence of monomer choice and ratios on particle characteristics.
  • To demonstrate the utility of SFEP-derived particles in subsequent chemical reactions.

Main Methods:

  • Solution polymerization using SFEP with monomers like propargyl acrylate (PA), styrene (Sty), and tert-butyl acrylate (t-BA).
  • Characterization using electron microscopy (including backscattering) and infrared spectroscopy.
  • Assessment of particle size, shape, surface properties, and chemical composition.

Main Results:

  • SFEP successfully produced spherical polymer particles (homopolymers and copolymers) in the 60-300 nm range.
  • Particles containing PA were suitable for copper-catalyzed azide-alkyne cycloaddition (CuAAc) reactions.
  • Electron microscopy revealed chemical and shape anisotropies in copolymer particles, indicating monomer phase separation.

Conclusions:

  • SFEP is a versatile, one-pot method for creating functional polymer particles.
  • The methodology avoids the use of conventional surfactants.
  • SFEP provides a straightforward approach to generating diverse functional polymer colloids.