Thermodynamics of thermally stable polymers - PBI
Graham, Alan Lyman
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Gas-solid chromatography (GSC) was used to determine the relative solubility of 35 solutes in poly-2, 2'-(meta phenylene)-5, 5'-bibenzimidazole (PBI). Experimental data at 141.8Â°C, 185Â°C and essentially atmospheric pressure for each solute in the PBI system at infinite dilution are presented. Pseudo activity coefficients, heats of adsorption (Î”h^-âˆž) and Gibbs energies of adsorption (Î”g^-âˆž ) were obtained from data taken at 141.8Â°C and 185Â°C at essentially atmospheric pressure. Values of Î”h and Î”g are related to solute polarizability and dipole moment. The significance of the results to polymer solubility is discussed. In addition, the solubility of PBI in four of the previous solutes, acetic acid, 1-butanol, 2,2 ethoxyethanol, and n-decane at 91Â°C and atmospheric pressure was obtained by static means. Excellent agreement was obtained between the relative solubility of the solutes in PBI predicted by GSC and from the static test data.