通过挤出流延和同步双向拉伸工艺制备了双向拉伸聚乙烯醇(BOPVA)薄膜。采用差式扫描量热仪、X射线衍射仪、电子拉力试验机和透氧仪测试了BOPVA的结构、力学性能和氧气阻隔性,研究了双向拉伸工艺条件对薄膜结构与性能的影响。结果表明:在130～155℃拉伸3—4倍、并在180～200℃进行热处理是较为适宜的工艺条件。在该范围内,较高的拉伸和热处理温度、较大的拉伸倍率和较长的热处理时间,可以促进薄膜结晶,有利于熔点、拉伸强度和氧气阻隔性的提高。
Biaxially oriented polyvinyl alcohol (BOPVA) films were prepared by the extrusion casting and synchronous biaxial stretching.Differential scanning calorimeter (DSC),X-ray diffractometer(XRD),electron tensile testing machine and oxygen permeability tester were used to characterize the structure and properties of BOPVA,and studied the effect of stretching process.The results shown that stretching 3—4 times at 130～155℃ with heat treatment at 180～200℃ was the proper stretching condition.Higher stretching and heat treatment temperature,higher stretching ratio and longer heat treatment could enhance the crystallization,thus improved the melting point,tensile strength and oxygen barrier rate.
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