Permeability of Fragrance Volatiles Through an Ethylene-Vinyl Acetate Co-Polymer Membrane Based Delivery System: The Effect of Time...", 1993 Polymers, Laminations & Coatings Conference Proceedings

Matur Booma, Heidi Hoojjat, Jack R. Giacin

The effect of temperature on the permeation of selected fragrance volatiles through an ethylene/vinyl acetate copolymer, membrane based fragrance delivery system was studied by an isostatic procedure. The permeation rates of the fragrance volatiles, linalool, phenethyl alcohol, benzyl acetate and a-hexyl cinnamaldehyde present in a floral and powder fragrance formulation were studied as a function of time and temperature for six weeks. Permeability studies were carried out at 22, 35 and 50°C at a flow rate of 20 cc/min. A flow rate of 20 cc/min. was selected based on preliminary studies to insure that bulk diffusion is the rate limiting step in the mass transfer process.

The transmission rates of the respective probe volatiles from the floral fragrance formulation through the test polymer structure were found to be temperature dependent. The finite concentration of the fragrance volatiles, as well as the continuous change in the driving force concentration provides a rational for the transmission profile curves obtained. The global or total volatile loss, as well as the percent loss of selected fragrance volatiles from the floral fragrance formulation, supports the temperature dependency of the mass transfer process. The relative concentration profile of the probe volatiles permeated through the ethylene/vinyl acetate membrane at 22 and 35 degrees Celcius, remained fairly constant. However, at 50 degrees Celcius significant changes in relative concentration were observed with run time.