scholarly journals Correlation between Cohesive Energy Density, Fractional Free Volume, and Gas Transport Properties of Poly(ethylene-co-vinyl acetate) Materials

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Piotr Kubica ◽  
Aleksandra Wolinska-Grabczyk
Keyword(s):  
Energy Density ◽  
Transport Properties ◽  
Vinyl Acetate ◽  
Free Volume ◽  
Cohesive Energy ◽  
Transport Model ◽  
Preceding Paper ◽  
Fractional Free Volume ◽  
Cohesive Energy Density ◽  
Poly Ethylene

The transport properties of the poly(ethylene-co-vinyl acetate) (EVA) materials to He, N2, O2, and CO2are correlated with two polymer molecular structure parameters, that is, cohesive energy density (CED) and fractional free volume (FFV), determined by the group contribution method. In our preceding paper, the attempt was made to approximate EVA permeability using a linear function of 1/FFV as predicted by the free volume theory. However, the deviations from this relationship appeared to be significant. In this paper, it is shown that permeation of gas molecules is controlled not only by free volume but also by the polymer cohesive energy. Moreover, the behavior of CO2was found to differ significantly from that of other gases. In this instance, the correlation is much better when diffusivity instead of permeability is taken into account in a modified transport model.

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

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.

Rheological assessment of cohesive energy density of highly concentrated stereolithography suspensions

2020 ◽  
Vol 46 (6) ◽  
pp. 8473-8477
Author(s):  
Mustafa K. Alazzawi ◽  
Charles L. Rohn ◽  
Berra Beyoglu ◽  
Richard A. Haber
Keyword(s):  
Energy Density ◽  
Cohesive Energy ◽  
Cohesive Energy Density
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