From Basics to Applications for Polymer Industry (영어발표)
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Preparation, Characterization and Application of Zeolite ZSM-5 Filled Polyethylene Films
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초록
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In this article, polyethylene (PE) films/zeolite ZSM-5 at different zeolite content (0, 2, 4 and 6 wt%) were prepared by blown extrusion process. The films were characterized by mechanical properties, differencial scanning calorimetry (DSC) and scanning electron microscope (SEM). Oxygen and carbon dioxide transmission rates were also tested. It was found that zeolite filled films decreases in tensile strength and elongation at break (EB). The SEM morphological observation shows a good dispersion and adhesion of zeolite in the PE matrix. Oxygen and carbon dioxide transmission rates increases after incorporating ZSM-5 zeolite into PE films. The zeolite filled polyethylene films were used as modified atmosphere packaging for litchi storage. Quality indexes of litchi during storage at 4 °C were measured in term of decay incidence, total soluble solids, titrable acidity, firmness and color. Within 4 weeks, there were no significant differences in quality indexes of litchi fruits packaged in zeolite containing films. Moreover, the fruit decay was found in PE film (~100%) rather than zeolite films (4-5%). The results suggested that zeolite/polyethylene packaging could be used for retaining excellent eating quality of litchi fruit during long term low temperature storage.