Thermodynamic Properties and Swelling Behavior of Glycolipid Monolayers at Interfaces

Matthias F. Schneider; Gerald Mathe; Motomu Tanaka; Richard R. Schmidt

doi:10.1021/jp0028103

Thermodynamic Properties and Swelling Behavior of Glycolipid Monolayers at Interfaces

The Journal of Physical Chemistry B ◽

10.1021/jp0028103 ◽

2001 ◽

Vol 105 (22) ◽

pp. 5178-5185 ◽

Cited By ~ 17

Author(s):

Matthias F. Schneider ◽

Gerald Mathe ◽

Motomu Tanaka ◽

Richard R. Schmidt

Keyword(s):

Thermodynamic Properties ◽

Swelling Behavior

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Thermodynamic Properties and Polymer Solvent Interaction Parameters for Silicone Rubber Networks

Rubber Chemistry and Technology ◽

10.5254/1.3547199 ◽

1968 ◽

Vol 41 (3) ◽

pp. 608-620 ◽

Cited By ~ 7

Author(s):

R. D. Seeley

Keyword(s):

Thermodynamic Properties ◽

Network Structure ◽

Silicone Rubber ◽

Volume Fraction ◽

Swelling Behavior ◽

Effective Number ◽

Solvent Interaction ◽

Molecular Weights ◽

Linear Relationships ◽

Equilibrium Swelling

Abstract The relationships of the volume fraction of rubber (silica reinforced silicone rubber vulcanizates) at equilibrium swelling to a corresponding solvent-rubber interaction parameter have been found to agree quite well with theory throughout the entire range of volume fractions investigated. Composite sigmoidal curves were constructed from the ϕrs versus μ data for the different vulcanizates. Temperature and solvent effects were found to merely shift the plotting points along the curves for the respective vulcanizates. Contrary to other work linear relationships between ϕrs and μ were found in this investigation only in the range of moderate dilations. Such relationships could lead to serious misinterpretations if the investigations involved ϕrs versus μ data near an inflection point. Thus, the value of μ relative to a corresponding ϕrs not only depend upon solvent (s) and temperature, but also upon the level of vulcanization at moderate to high dilations. The entropy, enthalpy, and free energy changes associated with the configurational changes occurring in the network structure of the rubber were calculated. The thermodynamic properties were found to be consistent and uniform throughout the dilation range. Limiting osmotic pressures were determined to obtain effective number average molecular weights of the crosslinked chains. The molecular weight values were found to average slightly less than three times those obtainable from ve/Vr data. Finally, this investigation has shown that reinforced silicone rubber vulcanizates at equilibrium swelling in a variety of solvents exhibit the swelling behavior predicted by theory. However, swelling behavior at moderate to high swelling was found to be unrelated to the rubber in general, but related more specifically to the network structure of the vulcanizate. At low dilations, the characteristics of the silicone rubber species control the swelling behavior.

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Models of Thermodynamic Properties of Prominences

International Astronomical Union Colloquium ◽

10.1017/s0252921100065799 ◽

1979 ◽

Vol 44 ◽

pp. 349-355

Author(s):

R.W. Milkey

Keyword(s):

Thermodynamic Properties ◽

Mass Transport ◽

Emission Spectrum ◽

Thermodynamic Parameters ◽

Working Group ◽

Physical Processes ◽

Theoretical Concepts ◽

Group 3 ◽

Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

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