Immobilization of Ti(O'Pr)₄ onto silicon oxide surfaces and surface-initiated polymerization of ε-caprolactone

The immobilization process of Ti(O′Pr)₄ on surfaces of silicon oxide and surface-initiated polymerization of εcapsulation, was analyzed. A substrate presenting hydroxyl-group-terminated self assembled monolayers was immersed in a toluene solution of Ti(O′Pr)₄ for 1 hour at room temperature and rinsed with toluene. Further, Ti₄ showing extreme oxophilicity and instability is easily transformed into titanium dioxide under mild hydrolytic conditions and this hampers various applications of titanium compounds. The results shows that PCL-coated films by the grafting-from method are obtained using immobilized titanium catalysts at the Si/SiO₂ substrate with benzyl alcohol as the initiator.