Studying adhesion mechanism of XDI-PU and H<sub>6</sub>XDI-PU using a Surface Forces Apparatus
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초록
내용
XDI (m-Xylylene diisocyanate) and H6XDI (1,3-bis(isocyanatomethyl)cyclohexane) are reported to exhibit good optical properties. Polyurethanes (PUs) containing these diisocyanates are widely used in various applications (e.g., coating and adhesives); however, detailed studies on their adhesion mechanism are limited. We synthesized six types of PUs using three polyols (PPG, PCL, PCD) and two isocyanates (XDI, H6XDI). A Surface Forces Apparatus (SFA) was used to measure the interaction between each PUs and the COOH-/CH3-functionalized SAMs in water. The hydrophobic interactions were measured to be the highest for PCD-containing PUs, while hydrogen bonding seemed to dominate the adhesion of PPG-containing PUs. The hydrophobic interaction was stronger for H6XDI compared to that of XDI in all polyols. These findings clarified adhesion mechanisms of XDI-/H6XDI- based PUs, and could further be used to control the strength of hydrogen bonds and hydrophobic interactions.