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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
Polymers02:34

Polymers

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,...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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,...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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 acceptor.
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.

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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Organization of "Pullulan"-block-polyether copolymers at the aqueous solution/air interface.

Sabrina Belbekhouche1, Jacques Desbrières, Virginie Dulong

  • 1Université de Rouen, Normandie Université, PBS, UMR CNRS 6270, Mont Saint Aignan, France.

Journal of Colloid and Interface Science
|March 19, 2013
PubMed
Summary

This study shows how pullulan block length affects copolymer structure at the air-water interface. Longer pullulan chains increase surface tension reduction and film thickness, indicating enhanced interfacial properties.

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Area of Science:

  • Polymer Science
  • Surface Chemistry
  • Materials Science

Background:

  • Investigating thermosensitive linear copolymers.
  • Focusing on polyetheramine (Jeffamine® M2005) and pullulan.
  • Understanding interfacial behavior is crucial for material applications.

Purpose of the Study:

  • To investigate the interfacial behavior of polyetheramine-pullulan copolymers.
  • To determine the influence of pullulan block length on copolymer structuring at the aqueous solution/air interface.
  • To analyze the impact of pullulan length on surface tension, interfacial rheology, and Gibbs film properties.

Main Methods:

  • Synthesis of a homologous series of linear copolymers.
  • Surface tension measurements.
  • Interfacial rheological measurements.
  • Analysis of transferred Gibbs films.

Main Results:

  • Copolymer systems show decreased surface tension, dependent on pullulan length.
  • Storage modulus of adsorption layers and Gibbs film thickness increase with longer pullulan blocks.
  • Evidence of structuring in the subphase and pullulan chain entanglement at the interface.

Conclusions:

  • Pullulan block length significantly influences copolymer structuring and interfacial properties.
  • Increased pullulan length enhances interfacial layer formation and stability.
  • Results from surface tension, rheology, and Gibbs films are consistent, validating the findings.