Fragility of glass-forming polymer liquids

Article Abstract:

The fragility of polymer glass-forming liquids as a function of molecular structural parameters from a generalized entropy theory of polymer glass-formation that combines the Adam-Gibbs model for the rate of structural relaxation with the lattice cluster theory for polymer melt thermodynamics. Experimentally establishes trends in the fragility of polymer melts with respect of variations in polymer microstructure and pressure are interpreted within the theory in terms of the accompanying changes for the chain packing efficiency.

Polymers, Lattice dynamics, Structure

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Thermodynamics of the hydrophobic effect

Article Abstract:

A thermodynamic theory is developed describing the transfer process of nonpolar substances from water to their pure state and the micellization process. If an error free result is considered (r= -0.2), it is possible to conclude that the absolute value of variation of the standard heat capacity is one order of magnitude bigger than the variation of the standard entropy.

Chemistry, Analytic, Analytical chemistry, Micelles

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Entropy of H2O wetting layers

Article Abstract:

The study was conducted to find out whether 0 K theoretical results are meaningful relative to experiments carried out at 150 K. It is concluded that at 150 K, where periodic adlayers on metals are observed, residual entropy reduces their free energies relative to a 3-D ice crystal by 4.5 meV/molecule, or ~3 percent of the cost of the adlayers' broken H-bonds.

Water, Hydrogen bonding, Hydrogen bonds

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