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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Synthesis of PEG-Polycycloether Block Copolymers: Poloxamer Mimics Containing a Rigid Helical Block.

Jean-Baptiste Masclef1, Joëlle Prunet1, Bernhard V K J Schmidt1

  • 1School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 23, 2024
PubMed
Summary
This summary is machine-generated.

New polycycloether block copolymers self-assemble into stable aggregates and emulsions. These materials offer tunable amphiphilicity and low surface tension for advanced applications in biomedicine, cosmetics, and food science.

Keywords:
emulsionhelicitypoloxamer mimicpolycycloetherself‐assembly

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Colloid Science

Background:

  • Poloxamers, amphiphilic block copolymers of PEG and PPG, exhibit self-assembly and interfacial properties dependent on block hydrophilicity/hydrophobicity.
  • Tuning block lengths in poloxamers allows adjustment of their properties.

Purpose of the Study:

  • To synthesize and characterize novel PEG-polycycloether block copolymers with a rigid polycyclic hydrophobic block.
  • To investigate the self-assembly, interfacial, and emulsion-forming properties of these new copolymers.

Main Methods:

  • Synthesis of diblock and triblock architectures with varying polycycloether backbones (atactic/isotactic, olefinic units).
  • Characterization of self-assembly behavior in water (aggregate size, critical aggregation concentration).
  • Measurement of surface tension and evaluation of high internal phase emulsion (HIPE) formation.

Main Results:

  • Self-assembly into spherical aggregates (64-132 nm) observed at low concentrations (CAC as low as 0.04 mg mL⁻¹).
  • Achieved low surface tensions (down to 26.7 mN m⁻¹) and stable HIPEs across all oil/water ratios.
  • Demonstrated distinct properties compared to conventional poloxamers P188 and P407 due to the rigid polycycloether block.

Conclusions:

  • The rigid polycycloether block significantly influences amphiphilic properties and colloidal behavior.
  • These novel copolymers exhibit promising characteristics for advanced emulsion formulations.
  • Potential applications span biomedicine, cosmetics, and the food industry.