Simultaneous Gravimetric and Calorimetric Analysis of Chloroform Sorption in Nanoporous Semicrystalline sPS

Chloroform vapor sorption in semicryst. syndiotactic polystyrene with a nanoporous cryst. form has been investigated by simultaneous gravimetric and calorimetric anal. to gather information on the sorption process and assocd. heat of sorption. At the investigated pressures of chloroform vapor, the sorption process is dominated by exothermic adsorption of penetrating mols. in the nanocavities of the cryst. phase. The mass uptake kinetics has been compared with the kinetics of evolution of heat of sorption measured simultaneously. The integral heat of sorption evaluated calorimetrically has been compared to the corresponding value calcd. by elaborating gravimetric sorption isotherms at several temps. evaluated independently through gravimetric sorption expts.