本研究利用雙螺桿押出機押出尼龍12彈性體薄膜，並進行不同倍率雙軸延伸，研究薄膜熱性 質與結晶取向關係。首先使用示差掃描量熱儀進行熱性質分析，並探討尼龍12彈性體結晶動 力學。再來分析雙軸延伸尼龍薄膜之性質，包括光學性質、氧氣穿透率及水蒸氣穿透率，以 及探討薄膜之延伸與結晶度之間的關係。

In this study, Nylon 12 elastomer film was casted by twin screw extruder and followed by bi-axially stretching with various ratios. In the first part, the thermal properties and crystallization kinetics were analyzed by measuring the heat flow in the adiabatic process by using differential scanning calorimetry (DSC). Furthermore, the properties of BOPA film were analyzed including optical properties, oxygen transmission rate (OTR), water vapor transmission rate (WVTR) and the relationship among the stretching and the crystallinity.