Metal-thermoplastic urethane hybrids in environmental exposure

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• 作者：Maija Hoikkanen^a ; ^{maija.hoikkanen@tut.fi} ; Mari Honkanen^a ; Laura Frisk^b ; Minnamari Vippola^a ; Toivo Lepistö ; ^a ; Jyrki Vuorinen^a
• 关键词：Plastic&ndash ; metal hybrid ; Aging ; Polyurethane ; Primers and coupling agents
• 刊名：International Journal of Adhesion and Adhesives
• 出版年：2012
• 期刊代码：75_01437496
• 类别：et
• 出版时间：June, 2012
• 卷：35
• 期：Complete
• 页码：21-26
• 文件大小：466 K

摘要

The long-term properties of injection moulded metal-thermoplastic urethane (TPU) hybrids were studied. The hybrids manufactured with different metal substrates, namely copper, stainless steel and aluminium, were compared, using two surface modifications for copper and stainless steel. N-(尾-aminoethyl)-纬-aminopropyltrimethoxysilane was used as coupling agent. It is concluded that the bond mechanism of the silane on different substrate differs, affecting the long-term behaviour of the respective hybrids. The thick layers of silane coupling agent on copper and stainless steel are sensitive to hydrolysis; thus the resistance in humid conditions is quite low. The high temperature exposure increased the bond strength and the fraction of cohesive failure in TPU in copper-TPU, aluminium-TPU and polished steel-TPU hybrids. The last one has native mixed oxide, contrary to controlled oxidised stainless steel, where adhesion decreased after any long-term experiments. This is suggested to derive from hydrogen bonding of the coupling agent to the surface Fe₂O₃ oxide.