Related Experiment Video
Updated: Mar 24, 2026
09:22
Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
Published on: February 7, 2017
8.3K
Doubly thermo-responsive copolymers in ionic liquid.
H H Nguyen1, M El Ezzi, C Mingotaud
1IMRCP, University of Toulouse, CNRS UMR 5623, 31062 Toulouse, France. viguerie@chimie.ups-tlse.fr.
Soft Matter
|March 3, 2016
Summary
Thermoresponsive block copolymers show double temperature-responsive behavior in ionic liquids. This allows for reversible shuttles between ionic liquids and water, driven by macromolecular structure and temperature changes.
Area of Science:
- Polymer Science
- Materials Chemistry
- Ionic Liquids
Background:
- Thermoresponsive polymers change solubility with temperature.
- Block copolymers combine properties of different polymer blocks.
- Ionic liquids are salts that are liquid at room temperature.
Purpose of the Study:
- To investigate the thermoresponsive behavior of block copolymers in an ionic liquid.
- To explore the relationship between polymer structure and temperature-dependent solubility.
- To assess the potential for creating novel drug delivery or separation systems.
Main Methods:
- Synthesis of block copolymers containing n-butyl acrylate and N-alkyl acrylamides.
- Solubility studies in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][NTf2]).
- Temperature-dependent characterization of polymer solutions and micellar structures.
Main Results:
- Poly(N-isopropylacrylamide) showed an upper critical solution temperature, while poly(n-butyl acrylate) exhibited a lower critical solution temperature.
- The block copolymers displayed double thermo-responsiveness, influenced by macromolecular architecture.
- A temperature-induced transition between micellar and reverse micellar structures was observed.
Conclusions:
- Block copolymers can be designed for dual thermo-responsiveness in ionic liquids.
- The observed structural switching enables reversible shuttling between ionic liquids and aqueous phases.
- These findings open possibilities for advanced applications in separation and controlled release technologies.
More Related Videos
12:07Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
Published on: April 16, 2018
14.2K
06:44From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
69.8K
Related Concept Videos
01:17Ion Exchange
1.5K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.5K
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.7K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.7K
01:29The Colloidal State
98
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
98
01:23Membrane Fluidity
178.9K
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
178.9K
01:26Polymer Classification: Stereospecificity
3.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
3.4K
03:13Intermolecular Forces
76.8K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
76.8K