功能氧化石墨烯/热塑性聚氨酯复合材料薄膜的制备及阻隔性能

为了提高热塑性聚氨酯(TPU)的阻隔性能,首先,采用溶液成型的方法在涂膜机上制备了功能氧化石墨烯(IP-GO)/TPU复合材料薄膜。然后,利用FTIR、XPS、XRD、FE-SEM、原子力显微镜和氧气透过仪对IP-GO/TPU复合材料的形貌和性能进行了表征。结果表明:IP-GO层间距相对原始鳞片石墨的增加了0.696nm,片层的厚度为1.2nm左右。IP-GO以褶皱层状的形式均匀分散在TPU基体中,并且包覆在复合材料薄膜断口表面。当IP-GO含量为3wt%时,IP-GO/TPU复合材料薄膜的氧气透过率为84.325cm3/(m2·d·Pa),相比纯TPU薄膜的280.973cm3/(m2·d·Pa)下降了70%,阻隔性能明显提高。研究解决了TPU薄膜阻隔性能不佳的问题,为高阻隔聚合物的制备提供了一种思路和方法。

Preparation and barrier properties of functional graphene oxide/thermoplastic polyurethane composite films

In order to improve the barrier properties of thermoplastic polyurethane (TPU), first, functional graphene oxide (IP-GO)/TPU composite films were prepared by solution casting method on the coating machine. Then, the morphologies and properties of IP-GO/TPU composite films were investigated by FTIR, XPS, XRD, FE-SEM, atomic force microscope and oxygen transmission rate tester. The results indicate that the layer spacing of IP-GO increases of 0.696 nm compared with the primitive flake graphite and the thickness of sheets is about 1.2 nm. IP-GO evenly dispersed in TPU matrix by form of fold layers, and coated on the fracture surfaces of composite films. When the contnent of IP-GO is 3wt%, the oxygen transmission rate of IP-GO/TPU composite film is 84.325 cm³/(m²·d·Pa), compared with the pure TPU film's value which is 280.973 cm³/(m²·d·Pa) decreases by 70%, reveals that the barrier property is improved significantly. The research solves the problem of poor barrier performance of TPU films, and provides a thought and a method for the preparation of high barrier polymers.