Journal of Polymer Science Part A-2 Polymer Physics · 1968 · 17 citations · 10 references
Natural SciencesMaterials EngineeringMaterials SciencePolymer ChemistryPolymer MaterialsRheologyPolymer CharacterizationPolymer NetworksPolymer PhysicsPolymer RheologyPolymer StructurePolymer ThermodynamicsPolymer Network ElasticityPolymer SwellingPolymer Swelling BehaviorPolymer Swelling EquilibriaRheology Of Polymer NetworksSwelling BehaviorThermoelastic PropertiesViscoelastic Properties Of Polymers
Abstract The energy component of the stress has been determined for poly(vinyl alcohol) networks in swelling equilibrium with a series of water–ethylene glycol compositions. The data are analyzed by using the equations describing the thermoelasticity of networks in swelling equilibrium. The ratio f e / f of the energy component to the total force, as calculated from these equations, varies systematically with diluent composition but is independent of elongation in a given diluent. For a network crosslinked by terephthalaldehyde, f e / f varied from −0.33 to −0.42 as the diluent composition was changed from pure water to 20% ethylene glycol. Similar effects were found in a network crosslinked by formaldehyde. It is not yet certain whether this effect represents a real solvent dependence of f e / f or a failure of the equation of state to account for the effect of composition changes on the force.
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