Vapor Pressure of Allyl Isothiocyanate and Its Transport in PVDC/PVC Copolymer Packaging Film

Equilibrium vapor pressures of allyl isothiocyanate (AIT) above pure AIT and AIT/canola oil mixtures from 15 to 45°C were estimated from AIT vapor densities using gas chromatography. Canola oil was an effective diluent for depressing AIT vapor pressure. Permeation of AIT in a PVDC/PVC copolymer film was measured using the dynamic quasi‐isostatic method, and kinetics of AIT vapor sorption in the polymer were studied gravimetrically. Experiments were carried out at 25, 35 and 45°C with vapor pressures from 50 to 800 Pa. At fixed vapor activity, diffusion and permeability coefficients increased with temperature, but a decrease was observed for solubility coefficient. An empirical equation was used to describe the sorption kinetics.