Heats of Solution and Swelling of Some Synthetic High-Molecular Compounds

1951 ◽  
Vol 24 (4) ◽  
pp. 773-776 ◽  
Author(s):  
A. Tager ◽  
V. Sanatina
Keyword(s):  
Mechanical Behavior ◽  
Polymer Chain ◽  
High Polymer ◽  
Heat Of Solution ◽  
Barrier Potential ◽  
Heats Of Solution ◽  
Molecular Compounds

Abstract 1. The heat of solution of a high polymer depends on the nature of the solvent as well as on the nature of the polymer. 2. The value and sign of the heat of solution of a polymer are related to the structure of the polymer and its mechanical behavior. For polymers which have relatively flexible chains, the heats of solution are negative ; for polymers which have relatively rigid chains, the heats of solution are positive. 3. The value and sign of the heat of solution indicate to a certain degree the change of the barrier potential of the polymer chain in any given solvent.

Thermochemistry of Silver Bromate

1971 ◽  
Vol 49 (3) ◽  
pp. 523-524 ◽  
Author(s):  
L. M. Gedansky ◽  
L. G. Hepler
Keyword(s):  
Solubility Product ◽  
Standard Entropy ◽  
Heat Of Solution ◽  
Heats Of Solution ◽  
Calorimetric Measurements

Calorimetric measurements of the heat of solution of AgBrO3(c) in NH3(aq) have been combined with earlier data on heats of solution of AgNO3(c) in water and in NH3(aq) to yield ΔH0 = 11.78 ± 0.11 kcal mol–1 for AgBrO3(c) = Ag+(aq) + BrO3−(aq). Combination of this value with ΔG0 = 5.83 kcal mol–1 from the solubility product gives ΔS0°= 19.96 cal deg–1 mol–1 for the standard entropy of solution of AgBrO3(c) at 298 °K.

The heats of solution of alcohols in water

1969 ◽  
Vol 22 (2) ◽  
pp. 347 ◽  
Author(s):  
DM Alexander ◽  
DJT Hill
Keyword(s):  
Enthalpy Of Solution ◽  
Heat Of Solution ◽  
Quadratic Dependence ◽  
Heats Of Solution ◽  
Low Concentrations

A new calorimeter has been developed and the enthalpy of solution of methanol, ethanol, propan-1-ol, propan-2-ol, butan-1-ol, and 2- methylpropan-2-ol, in water to low concentrations, measured between 5� and 35�. In all cases, the results can be adequately represented by a quadratic dependence of heat of solution on temperature. The results have been compared qualitatively with the data for the hydrocarbons.

Ligand field splitting energies of the hexaamminecobalt(II) ion and the hexaamminenickel(II) ion measured by a calorimetric method

1970 ◽  
Vol 48 (14) ◽  
pp. 2177-2181 ◽  
Author(s):  
Badri Muhammad ◽  
J. W. S. Jamieson
Keyword(s):  
Close Agreement ◽  
High Energy ◽  
Calorimetric Method ◽  
Ligand Field ◽  
Maximum Difference ◽  
Kcal Mole ◽  
Heat Of Solution ◽  
Field Splitting ◽  
Heats Of Solution ◽  
Splitting Energy

Various normal lower ammines and high-energy modifications of the lower ammines of cobalt(II) sulfate and nickel(II) sulfate have been prepared and the heats of solution in dilute ammonia have been measured for both types. For each of these ammine systems the maximum difference in heat of solution, expressed as kcal/mole of each heptaammine, between the high-energy and the normal salts has been found to be in close agreement with the ligand field splitting energy of the hexaamminemetal(II) ion.

Calorimetrie an Ammoniumyttriumhalogeniden / Calorimetry of Ammonium Yttrium Halides

1997 ◽  
Vol 52 (3) ◽  
pp. 311-314 ◽  
Author(s):  
S. Ehrlich ◽  
H. Oppermann ◽  
C. Hennig
Keyword(s):  
Enthalpies Of Formation ◽  
Heat Of Solution ◽  
Heats Of Solution ◽  
Solid Phases

Abstract The heat of solution of all solid phases in the system YX3-NH4X with X = Cl, Br, I in 4n HX was investigated. The enthalpies of formation of the ammonium yttrium halides are derived from the enthalpies of formation of Y X3 and of NH4X and their heats of solution in An HX: ΔHB0(NH4Y2Cl7,f,298) = -561,5 ± 1,7 kcal/mol, ΔHB0((NH4)3 YCl6,f,298) = -474,5 ± 1,3 kcal/mol,ΔHB0((NH4)3YBr6,f,298) = -400,8 ± 2,6 kcal/mol, ΔHB0((NH4)3YI6,f,298) = -291,9 ± 3,0 kcal/mol.

The Heats of Solution and Related Thermodynamic Properties of Sodium Chlorate in Water and Water–Dioxane Mixtures

1971 ◽  
Vol 49 (2) ◽  
pp. 217-224 ◽  
Author(s):  
A. N. Campbell ◽  
O. Bhatnagar
Keyword(s):  
Free Energy ◽  
Thermodynamic Properties ◽  
Activity Coefficients ◽  
Direct Method ◽  
Sodium Chlorate ◽  
Saturated Solution ◽  
Heat Of Solution ◽  
Heats Of Solution ◽  
Tentative Explanation ◽  
A Direct Method

The heats of solution of sodium chlorate in water, and in several water-dioxane mixtures, have been determined experimentally at concentrations of salt ranging from 0.01 molal to saturation. For the dilute region, a direct method was used but for the concentrated range the method was that of diluting the saturated solution. The free energy decreases due to dilution have been calculated from previously determined activity coefficients. Using these data, the entropy changes have been evaluated.The graph of heat of solution vs. concentration of sodium chlorate passes through a minimum for the solutions more concentrated in dioxane, but not for water and weak dioxane mixtures. A tentative explanation of this is offered.

Mechanical behavior of a single polymer chain in a non-solvent

Polymer ◽  
2011 ◽  
Vol 52 (24) ◽  
pp. 5644-5647 ◽  
Author(s):  
Jun-ichi Horinaka ◽  
Tomohiro Takaki ◽  
Toshikazu Takigawa
Keyword(s):  
Mechanical Behavior ◽  
Polymer Chain ◽  
Single Polymer Chain
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