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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 properties that they exhibit. Additionally,...
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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 generated carbocation,...
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Adsorption of conditioning polymers on solid substrates with different charge density.

Eduardo Guzmán1, Francisco Ortega, Nawel Baghdadli

  • 1Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040-Madrid, Spain.

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Summary
This summary is machine-generated.

Polymer adsorption on surfaces depends on surface charge. These cosmetic polymers form water-rich layers, driven by chain-surface interactions.

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Area of Science:

  • Surface Science
  • Polymer Science
  • Materials Chemistry

Background:

  • Polymers are widely used in cosmetics as conditioning agents.
  • Understanding polymer adsorption is crucial for optimizing product performance.
  • Solid surfaces with varying charge densities interact differently with polymers.

Purpose of the Study:

  • To investigate the adsorption behavior of neutral hydrophilic and cationic polysaccharide polymers on surfaces with different charge densities.
  • To characterize the adsorbed polymer layers using advanced techniques.
  • To elucidate the driving forces and properties of these polymer adsorption systems.

Main Methods:

  • Dissipative Quartz Crystal Microbalance (D-QCM) to measure adsorption kinetics and layer properties.
  • Ellipsometry to determine adsorbed mass and layer thickness.
  • Systematic variation of surface charge density to study its effect on adsorption.

Main Results:

  • Adsorption kinetics involved at least two steps for both polymer types.
  • Total adsorbed polymer amount was significantly influenced by surface charge density.
  • Calculated water content of adsorbed layers was high.
  • D-QCM analysis revealed a rubber-like mechanical behavior of the polymer layers.
  • Chain-surface interaction energy identified as the primary adsorption driver.

Conclusions:

  • Surface charge density is a critical factor governing polymer adsorption.
  • Adsorbed cosmetic polymer layers are highly hydrated and exhibit viscoelastic properties.
  • The study provides fundamental insights into polymer-surface interactions relevant to cosmetic formulations.