Estimation of the cohesive energy density of a polymer from critical opalescence measurements

1968 ◽  
Vol 46 (24) ◽  
pp. 3919-3921 ◽  
Author(s):  
J. M. G. Cowie
Keyword(s):  
Energy Density ◽  
Concentration Dependence ◽  
Interaction Parameter ◽  
Cohesive Energy ◽  
Cohesive Energy Density ◽  
A Value ◽  
Critical Opalescence ◽  
Entropy Parameter ◽  
Polymer Interaction ◽  
Good Agreement

It has been demonstrated recently by Koningsveld that the concentration dependence of the solvent–polymer interaction parameter cannot be neglected in certain systems. By considering this effect in the polystyrene–cyclohexane system it has been possible to calculate a value for the entropy parameter ψ. Estimation of the cohesive energy density (c.e.d.) of polystyrene using this corrected ψ gave a result in good agreement with values of the c.e.d. obtained from other sources.

The Interaction between Rubber and Liquids. III. The Swelling of Vulcanized Rubber in Various Liquids

1943 ◽  
Vol 16 (2) ◽  
pp. 263-267 ◽  
Author(s):  
G. Gee
Keyword(s):  
Energy Density ◽  
Cohesive Energy ◽  
Molecular Volume ◽  
Substantial Agreement ◽  
Swelling Power ◽  
Cohesive Energy Density ◽  
Vulcanized Rubber ◽  
A Value

Abstract The entropy of swelling of vulcanized rubber is estimated, and assumed independent of the nature of the swelling liquid. The heat of swelling is related to the cohesive energy of the liquid, and a value of 66 calories per cc. deduced for the cohesive energy density of rubber. The swelling power of a liquid can be calculated approximately if its cohesive energy and molecular volume are known. Substantial agreement with theory is found in most cases, although it is necessary to consider aliphatic and aromatic liquids separately. The anomalously high swelling power of acids and alcohols arises from their association.

Polymer—Solvent Interaction Parameter and Creep of Ethylene—Propylene Rubber

1964 ◽  
Vol 37 (4) ◽  
pp. 894-903 ◽  
Author(s):  
T. J. Dudek ◽  
F. Bueche
Keyword(s):  
Energy Density ◽  
Interaction Parameter ◽  
Cohesive Energy ◽  
Tensile Creep ◽  
Solvent Interaction ◽  
Ethylene Propylene ◽  
Cohesive Energy Density ◽  
Creep Curves ◽  
Ethylene Propylene Rubber ◽  
Polymer Solvent

Abstract The polymer—solvent interaction parameter for an ethylene—propylene ter-polymer containing 53 mole-% ethylene was determined as a function of degree of crosslinking in n-heptane and benzene. A well characterized EPR gum vulcanizate was used to obtain the polymer-solvent interaction parameter in fourteen solvents, and the cohesive energy density of the terpolymer was evaluated. The composite tensile creep curves for gum and filled EPR vulcanizates were obtained and compared with SBR creep curves.

Liquid Structure, Thermodynamics, and Mixing Behavior of Saturated Hydrocarbon Polymers. 1. Cohesive Energy Density and Internal Pressure

1998 ◽  
Vol 31 (20) ◽  
pp. 6991-6997 ◽  
Author(s):  
Janna K. Maranas ◽  
Maurizio Mondello ◽  
Gary S. Grest ◽  
Sanat K. Kumar ◽  
Pablo G. Debenedetti ◽  
...  
Keyword(s):  
Energy Density ◽  
Internal Pressure ◽  
Cohesive Energy ◽  
Saturated Hydrocarbon ◽  
Liquid Structure ◽  
Cohesive Energy Density ◽  
Mixing Behavior ◽  
Hydrocarbon Polymers
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