
Accession Number : AD0618989
Title : A THEORY OF THE THERMODYNAMIC BEHAVIOR OF NONELECTROLYTE SOLUTIONS. III. THE OSMOTIC PRESSURE OF POLYMER SOLUTIONS,
Corporate Author : CASE INST OF TECH CLEVELAND OHIO
Personal Author(s) : Maron,Samuel H. ; Nakajima,Nobuyuki
Report Date : 27 AUG 1959
Pagination or Media Count : 14
Abstract : Data on the osmotic pressures of both dilute and concentrated polystyrene and polyisobutylene solutions in various solvents were examined in terms of Maron's theory. It is shown that for each polymersolvent system at a given temperature the behavior over the entire concentration range studied can be characterized by a single interaction parameter, mu, whose dependence on volume fraction, v2, of polymer is given by mu = muo + sigmao(v2), where muo and sigmao are constants. For two systems, where data are available, this linear relationship was found to hold from v2 = 0 up to v2 =0.90. With this relationship for mu, Maron's theory leads to functional plots for dilute solutions which are linear even in systems where the usual II/C vs. C plots are not straight lines. These plots yield the molecular weights from the intercepts and the quantities (muo  sigmao) from the slopes. However, the individual values of muo and sigmao cannot be obtained from the dilute solution data. To arrive at these, data are required at concentrations higher than those customarily used for molecular weight determinations. (Author)
Descriptors : (*POLYMERS, THERMODYNAMICS), (*STYRENE PLASTICS, SOLUTIONS(MIXTURES)), (*POLYETHYLENE PLASTICS, SOLUTIONS(MIXTURES)), (*OSMOTIC PRESSURE, POLYMERS), THEORY, EQUATIONS, ORGANIC SOLVENTS, MOLECULAR WEIGHT
Distribution Statement : APPROVED FOR PUBLIC RELEASE