Surface modification of glass by oligomeric fluoroalkylating agents having oxime-blocked isocyanate groups

A new type of oligomeric fluoroalkylating agent with oxime-blocked isocyanate groups was synthesized and the modification of a glass surface using this oligomer was studied. Based on contact angle measurements, the surface free energy of the modified glass was calculated. The results show that the glass surface was effectively fluoroalkylated, the surface free energy was lowered enough and the glass surface became both water- and oil-repellent. The longer the chain length of the fluoroalkyl group (R f) is, the lower is the surface free energy of the modified glass. There existed a good relationship between the surface free energy and the F 1s /Si 2 p peak area ratio measured by XPS. The surface free energies decreased with an increase of this peak area ratio and above a ratio of 2, they became constant. The effects of modification by fluoroalkyl end-capped oligomers having oxime-blocked isocyanate groups and fluoroalkyl end-capped silanes were interpreted in terms of the structure of the modified layer, i...