Polymerization and Characterization of Gas Permselectivity Functional Packaging Materials

Abstract

Gas permselectivity film is an emerging material which enables it with gas selective permeability functions so as to keep the preservation atmosphere including water vapor, oxygen and other gas concentration of inner packages and thus extends the preservation period of fresh fruits. In this work, the monomer Hexamethyldisilazane (HMDS) and oxygen gas were applied as the precursor and reaction gas, the gas permselective material were deposited on PET and Chitosan substrate by plasma enhanced chemical vapor deposition (PECVD) method, respectively. Different reaction parameters such as monomer proportions, plasma input powers and deposition time were investigated respectively. The film properties were analyzed by Surface Profiler thickness test, Fourier Transform Infrared Spectroscopy (FTIR), water vapor transmission rate test (WVTR) and oxygen transmission rate test (OTR). The experimental results showed that plasma input power and monomer ratio influence the gas selective permeation (OTR/WVTR ratio) greatly. And also, the mechanism of gas selective permeation of the film was preliminary discussed.