Hygroscopicity and the water-polymer interaction parameter of nano-sized biodegradable hydrophilic substances

2021 ◽  
pp. 1-15
Author(s):  
Chun-Ning Mao ◽  
Kotiba A. Malek ◽  
Akua Asa-Awuku
Keyword(s):  
Interaction Parameter ◽  
Polymer Interaction

Interaction Parameters and Heats of Dilution for Ethylene Propylene Rubber in Various Solvents

1966 ◽  
Vol 39 (5) ◽  
pp. 1451-1459 ◽  
Author(s):  
Earl D. Holly
Keyword(s):  
Interaction Parameter ◽  
Polymer Concentration ◽  
Interaction Parameters ◽  
Temperature Dependent ◽  
Heat Of Dilution ◽  
Ethylene Propylene ◽  
Thermodynamic Criterion ◽  
Heats Of Dilution ◽  
Ethylene Propylene Rubber ◽  
Polymer Interaction

Abstract Crosslinked ethylene propylene rubber gels were swollen in five solvents at 25–100° C. The solvent polymer interaction parameter μ for each system was determined as a function of temperature and polymer concentration. A thermodynamic criterion of the sign of the heat of dilution, ΔH1, was pointed out. For three of the systems ΔH1 was negative. The entropy contribution to the interaction parameter was found to be smaller than usual for systems having a temperature-dependent heat of dilution. The heats of dilution and the entropy terms may be consistently interpreted in terms of Prigogine's theory of solutions.

Polymer-polymer interaction parameter determined by inverse gas chromatography

Polymer ◽  
1987 ◽  
Vol 28 (13) ◽  
pp. 2329-2334 ◽  
Author(s):  
O.S. Tyagi ◽  
S.M. Sajjad ◽  
Sajid Husain
Keyword(s):  
Gas Chromatography ◽  
Interaction Parameter ◽  
Inverse Gas Chromatography ◽  
Polymer Interaction

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.

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