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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
Enthalpy of Solution02:39

Enthalpy of Solution

There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

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Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in Poly(S-Divinylbenzene)
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Interactions between gemini surfactants and polymers: thermodynamic studies.

Rita Muzzalupo1, Maria Rosa Infante, Lourdes Pérez

  • 1Dipartimento di Scienze Farmaceutiche, Università della Calabria, Via P. Bucci s.n.c., Arcavacata di Rende, (Cs), I-87030 Italia.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 20, 2007
PubMed
Summary

Gemini surfactants interact with hydrophobically modified pullulan (PULAU9) via hydrophobic alkyl groups, forming binding sites for aggregates. Cationic Gemini surfactants show no interaction with poly(vinylpyrrolidone) (PVP).

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Area of Science:

  • Physical Chemistry
  • Polymer Science
  • Colloid and Surface Science

Background:

  • Investigating polymer-surfactant interactions is crucial for understanding solution behavior and developing new materials.
  • Gemini surfactants, with their unique structure, offer tunable properties for various applications.
  • Poly(vinylpyrrolidone) (PVP) and hydrophobically modified pullulan (PULAU9) represent distinct polymer architectures for interaction studies.

Purpose of the Study:

  • To explore the interactions between different Gemini surfactants and two types of polymers (PVP and PULAU9) in aqueous solutions.
  • To characterize the influence of Gemini surfactant structure (head groups, alkyl chain length, spacer) on these interactions.
  • To determine the thermodynamic parameters governing polymer-surfactant binding.

Main Methods:

  • Synthesis, purification, and characterization of Gemini surfactants with varying head groups, chain lengths, and spacers.
  • Surface activity and solution calorimetry measurements to assess micelle formation and polymer-surfactant interactions.
  • Ionic conductivity measurements to determine critical association concentration (CAC) and critical micelle concentration (CMC*).

Main Results:

  • Gemini surfactants exhibit significant interactions with PULAU9, attributed to hydrophobic interactions between surfactant alkyl chains and the polymer backbone.
  • Cationic Gemini surfactants showed no interaction with PVP, while other surfactants displayed varying degrees of interaction.
  • Thermodynamic analysis revealed that Gibbs energy of transfer (DeltaGtrans) decreases and enthalpy of transfer (DeltaHtrans) becomes more negative with increasing polymer concentration.

Conclusions:

  • The hydrophobic nature of the polymer backbone (PULAU9) is a key factor driving significant Gemini surfactant interactions.
  • Polymer architecture dictates the extent and nature of polymer-surfactant binding, with PVP showing limited interaction with cationic Geminis.
  • The study provides valuable insights into the fundamental principles governing complex fluid behavior in polymer-surfactant mixtures.