Structure and strength at the bonding interface of a titanium‐segmented polyurethane composite through 3‐(trimethoxysilyl) propyl methacrylate for artificial organs

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Abstract
The objective of this study was to investigate the structure and strength at the bonding interface of a titanium (Ti)‐segmented polyurethane (SPU) composite through (3‐trimethoxysilyl) propyl methacrylate (γ‐MPS) for artificial organs. The effects of the thickness of the γ‐MPS layer on the shear bonding strength between Ti and SPU were investigated. Ti disks were immersed in various concentrations of γ‐MPS solutions for several immersion times. The depth profiles of elements and the thickness of the γ‐MPS layer were determined by glow discharge optical emission spectroscopy and ellipsometry, respectively. The bonding stress at the Ti/γ‐MPS/SPU interface was evaluated with a shear bonding test. Furthermore, the fractured surface of a Ti‐SPU composite was observed by optical microscopy and characterized using X‐ray photoelectron spectroscopy. Consequently, the thickness of the γ‐MPS layer was controlled by the concentration of the γ‐MPS solution and immersion time. The shear bonding stress at the interface increased with the increase of the thickness of the γ‐MPS layer. Therefore, the control of the thickness of the γ‐MPS layer is significant to increase the shear bonding stress at the Ti/γ‐MPS/SPU interface. These results are significant to create composites for artificial organs consisting of other metals and polymers. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res, 2007

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