Effects of moisture ingression on polymeric laminate composites and its prevention via highly robust barrier films
Effects of moisture ingression on polymeric laminate composites and its prevention via highly robust barrier films
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DOI：
10.1007/s00170-014-5974-5
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发表时间：
2014-05
期刊：
影响因子：
--
通讯作者：
E. Kececi;R. Asmatulu
中科院分区：
文献类型：
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作者：
E. Kececi;R. Asmatulu
三种不同的纤维增强复合材料测试层压板铺设使用碳，玻璃，和凯夫拉增强环氧树脂树脂，然后四种不同的疏水阻隔膜被放置在测试层压板的顶部作为最外层（最后一层）。按照推荐的固化循环，通过高压釜共固化制备的样品。这些疏水阻隔膜包括聚醚醚酮或PEEK（12.7和25.4 μm厚度）、聚四氟乙烯或Teflon（25.4 μm）和聚氟乙烯（PVF）或Tedlar（25.4 μm）。Tedlar薄膜一直是航空航天复合材料中用于防潮的唯一来源，因此本研究的目的是确定其他替代品及其防潮特性。对复合板的阻隔膜进行的胶带粘附力测试表明，PEEK和Tedlar膜良好地结合在复合材料表面上，而Teflon膜未通过胶带粘附力测试。将与阻隔膜共粘合的层压复合材料浸入水中长达29天，然后在浸入之前和之后对每个样品进行3点弯曲测试。测试结果表明，碳、玻璃和Kevlar层压复合材料上的25.4 μm厚PEEK和Tedlar膜提供了相似的机械性能。此外，与没有任何阻挡膜的相同层压体相比，结合有阻挡膜的层压体表现出显著更高的机械性能。该研究表明，这些阻隔膜大大减少了水分进入层压复合材料结构，这可能是有用的复合材料飞机和风力涡轮机的应用。
Three different fiber-reinforced composite test laminates were laid up using carbon-, glass-, and Kevlar-reinforced epoxy prepregs, and then four different hydrophobic barrier films were placed as the out-of-most ply (last ply) on top of the test laminates. The prepared samples were co-cured through an autoclave per recommended cure cycles. These hydrophobic barrier films included polyether ether ketone or PEEK (12.7- and 25.4-μm thicknesses), polytetrafluoroethylene or Teflon (25.4 μm), and polyvinyl fluoride (PVF) or Tedlar (25.4 μm). Tedlar films have been the only source used for moisture prevention in Aerospace composites, so the purpose of the present study was to determine other alternatives and their moisture ingression prevention characteristics. The tape adhesion tests conducted on the barrier films of the composite panels indicated that PEEK and Tedlar films were well bonded on the composite surfaces, while Teflon films failed the tape adhesion tests. The laminate composites that were co-bonded with barrier films were immersed in water up to 29 days, and then 3-point bend tests were conducted on each sample before and after immersion. Test results show that 25.4-μm thick PEEK and Tedlar films on the carbon, glass, and Kevlar laminate composites provided similar mechanical properties. Also, the laminates incorporated with barrier films exhibited significantly higher mechanical properties when compared to the same laminates without any barrier films. This study indicated that these barrier films considerably reduced moisture ingression into the laminate composite structures, which may be useful for applications in composite aircraft and wind turbines.