Effect of pressing on the diffusional properties of polyacetylene

Abstract

Pressing of polyacetylene films before (or after) sorption of dopant can reduce significantly the rate of sorption (or desorption) due to reduced effective surface area and pore sue, as is found in the experiments of vapour sorption and desorption of hexane and iodine. On exposure to air, the pressed films have significantly lower oxidation rates at 120°C than the unpressed ones. ZUSAMMENFASSUNG:Das Pressen von Polyacetylenfilmen vor (oder nach) der Sorption von Dotierungsagentien kann die Geschwindigkeit der Sorption (oder Desorption) wegen der verringerten effektiven OberflBche und der PorengrODe sehr stark reduzieren. Dies wurde in Versuchen iiber die Sorption und Desorption von Hexan und Jod nachgewiesen. Bei der Einwirkung von Luft zeigen die geprefiten Filme wesentlich geringere Oxidationsgeschwindigkeiten bei 120 "C als die ungeprefiten.

Influence of Processing Methods on the Structure and Properties of Composite Polymeric Materials

“…It should be pointed out that investigation of the kinetics of sorption of low-molecular-weight substances makes it possible to study the structure of composite polymeric materials and its change as a function of different factors. The obtained experimental data ( Figure 1) Translated by P. Curtis that the equilibrium degree of swelling Q ¥ and D of low-molecular-weight substances in the investigated composite polymeric materials decrease with increase in the pressing pressure of specimens, which is the result of a decrease in pore size [2]. It was established that increase in pressing pressure above 3-4 MPa does not lead to any change in the diffusion and sorption or deformation and strength properties of composite polymeric materials.…”