| Summary: | 碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 100 === In this study, the effects of biaxial orientation extended on the physical properties and morphology of multi micro-layers film were investigated. The 3-layers and 100-layers of LLDPE-g-MAH/EVOH hybrid films were fabricated via multi micro(nano)-layers co-extrusion technique. The films were thermal treated at 140℃, biaxial orientation extended 2x2 and 2.5x2.5 ratios. Moreover, the 100 layers of different thickness of aPP/EVOH films were fabricated and biaxial orientation extended at 3x3, 4x4, 5x5, 6x6 and 7x7 to strengthen molecular interaction. The experimental were examined through DSC, TGA, DMA, TMA, XRD, and SEM to analyze the properties of crystallinity, thermal behavior and interface. The tensile strength, O2TR, WVTR and Melt Flow Index of multilayer films were carried out as well.
The results showed the more layers of LLDPE-g-MAH/EVOH, the better physical properties and WVTR. The orientation extended depended on the thickness ratio of LLDPE/EVOH. The different thickness ratio of aPP/EVOH resulted in higher orientation extended and strength correspondingly. The thinner the interface of aPP/EVOH, the higher van-der-waals force, the lower value in O2TR.From SEM results, and the aPP/EVOH exhibited the best O2TR in high orientation(5x5) extended.
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