Transient solidlike behavior near the cylinder/disorder transition in block copolymer solutions

Article Abstract:

The solution behavior just above [T.sub.ODT] by rheology and small-angle X-ray scattering of symmetric polystyrene(PS)-block-polyisoprene diblock copolymer in PS-selective solvents is examined by varying the degree of solvent selectivity for PS: diethyl phthalate (DEP)/di-n-butyl phthalate (DBP) (75:25 vol %) > DEP/DBP (50:50 vol %). The solutions undergo the two-step transitions, one between the hexagonal cylinders phase and a transient phase with a solidlike rheological response and the other to a disordered liquid of micelles.

Usage, Spectra, X-ray spectroscopy, Copolymers

---

Ion gels by self-assembly of a triblock copolymer in an ionic liquid

Article Abstract:

A unique method of creating ion gels by gelation of poly (styrene-block-ethylene oxide-block-styrene) (SOS) triblock copolymer in the room-temperature ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([IBMIM][P[F.sub.6]]) is presented. The gelation behavior, ionic conductivity, rheological properties and microstructures of ion gels developed is investigated and it is inferred that the triblock polymer gelation method is an advantageous technique to create highly conductive ion gels.

Rheology, Block copolymers, Gelation

---

Effect of water and organic solvents on the ionic dissociation of ionic liquids

Article Abstract:

The studies related to the effect of water and several organic solvents on density, viscosity, and conductivity of some of the ionic liquids (ILs) reveal that organic solvents enhance the ionic association of the ILs, depending on the solvent dielectric constant. While water promotes dissociation due to its high dielectric constant and its ability to form strong hydrogen bonds with the anions of ILs.

Hydrogen bonding, Hydrogen bonds, Viscosity

Similar abstracts:

• Abstracts: Nanoconfinement and the glass transition: A cluster hypothesis. Supra-aggregates of fiber-forming anisotropic molecules
• Abstracts: Density functional theory for the distribution of small ions around polyions. Integral equation theory for symmetric nonadditive hard sphere mixtures
• Abstracts: Role of the Coulombic interaction in ligand-induced biopolymer aggregation. Models of adsorption at a line of three-phase contact
• Abstracts: Arkema heads to China for growth. Mega-trends in the fine chemicals industry: mergers, acquisitions & globalization
• Abstracts: Direct quantification of intraparticle protein diffusion in chromatographic media. The mesoscopic dynamics of thermodynamic systems

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.