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Kinetics of the formation of swollen surface layer in the system polyamide-formic acid

V. Kellö, L. Lapčík, S. Hrivnák, J. Polavka, J. Panák, J. Repka, J. Očadlík, and V. Kalíšek

Department of Physical Chemistry, Slovak Technical University, 880 37 Bratislava


Abstract: The kinetics of the formation of swollen surface layer was studied in the system crosslinked and noncrosslinked polyamide (PAD)—formic acid. It has been ascertained that the transport process of the diffusion of formic acid into the solid sample of modified and nonmodified PAD formally obeys the Fick's law. Furthermore, it has been found that the value of the parameter n occurring in the equation  δ=k tn describing the time dependence of the total width of polymeric layer decreases with decreasing concentration of formic acid in the initial penetrant. The values of mean integral diffusion coefficients of formic acid in PAD are comparable with the values found by Doležel for other penetrants. The activation energies of interfacial diffusion for all samples investigated varied in the range 24—27 kJ mol-1 while their values were not substantially affected by the amount of the bonded crosslinking agent — triphenyl phosphite.

Full paper in Portable Document Format: 322a175.pdf


Chemical Papers 32 (2) 175–185 (1978)

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