Studying adhesion mechanism of XDI-PU and H<sub>6</sub>XDI-PU oligomers using a Surface Forces Apparatus (SFA)
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XDI and H6XDI are reported to exhibit high stability and reactivity. Polyurethanes containing these diisocyanates are widely used in various applications (e.g., coating, adhesives); however, detailed studies on their adhesion mechanism are limited. We synthesized and structurally analyzed six different types of oligomers using three polyols (PPG, PCL, PCD) and two isocyanates (XDI, H6XDI). A Surface Forces Apparatus was used to measure the interaction between each oligomer and the COOH-/CH3-functionalized SAMs in water. The hydrophobic interactions were measured to be the highest for PCD-containing oligomers, while hydrogen bonding seemed to dominate the adhesion of PPG-containing oligomers. The hydrophobic interaction was stronger for H6XDI compared to that of XDI in all polyols. These findings clarified possible adhesion mechanisms of XDI- and H6XDI- based oligomers, and could be used to control the strength of interactions.