Acceleration of Gas Permeation in Polyethylene Group Films by Aroma Component Absorption

Characteristics permeability variation of gases (H_2, O_2, N_2, CO_2, C_2H_4, and C_3H_6) in polyethylene group films(HDPE, LLDPE, LDPE, EVA 5 and EVA 7) swollen by d-Limonene (DL) absorption has been evaluated as a function of the crystallinity of the test films. Based on the evidence that the permeability of all the gases and DL vapor increased with decreasing crystallinity of the films. It was concluded that the permeability of all the gases and DL vapor positively depends on the proportion of amorphous domain in the films. The rate of permeation for all the gases was drastically accelerated by the DL absorption into the films and the permeability of CO_2 and C_3H_6, was particularly, increased as 5-7 times higher than the virgin films. The diffusivity of all the gases, in contrast, was clearly decreased by the DL-absorption in the films