Publication

Phase behavior, rheology and erosion behavior of hydrogels of fluorocarbon end-capped PEG

2000
Conference Papers

Abstract

Characteristics of hydrogels formed by assocn. of hydrophobically-modified polyethylene glycol (PEG) with fluoroalkyl (Rf) end-groups can be controlled by modulating their mol. structures. Polymers with relatively long PEG chains (e.g., 20 kg/mol PEG with C-10 Rf) follow the typical single-phase, continuous transition from sol to gel. As the PEG length is reduced relative to fluoroalkyl length (10 kg/mol PEG with C-8 or C-10 Rf) the phase behavior changes to sol-gel coexistence ("two-phase" type) behavior. This correlates with changes in the rheol. properties of the gel and in its erosion behavior. Finally, for sufficiently short PEG length the polymer ppts. into a concd. gel with negligible soly. in water. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/455728e7-271f-4332-8f61-aa6318f895f1

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2000
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/455728e7-271f-4332-8f61-aa6318f895f1

About this result

Related concepts (31)

Phase transition

In chemistry, thermodynamics, and other related fields, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas, and in rare cases, plasma. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change as a result of the change of external conditions, such as temperature or pressure.

Phase (matter)

In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a second phase, and the humid air is a third phase over the ice and water. The glass of the jar is another separate phase. (See .) More precisely, a phase is a region of space (a thermodynamic system), throughout which all physical properties of a material are essentially uniform.

Phase diagram

A phase diagram in physical chemistry, engineering, mineralogy, and materials science is a type of chart used to show conditions (pressure, temperature, volume, etc.) at which thermodynamically distinct phases (such as solid, liquid or gaseous states) occur and coexist at equilibrium. Common components of a phase diagram are lines of equilibrium or phase boundaries, which refer to lines that mark conditions under which multiple phases can coexist at equilibrium. Phase transitions occur along lines of equilibrium.

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Phase behavior, rheology and erosion behavior of hydrogels of fluorocarbon end-capped PEG

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