Uniform Grafting of Poly(1,5-dioxepan-2-one)by Surface-Initiated,Ring-Opening Polymerization

摘要

A polymeric film of a biodegradable poly(1 ,5-dioxepan-2-one)(PDXO)was formed on a gold surface by a combination of the formation of self-assembled monolayers (SAMs)presenting hydroxyl groups and the surface-initiated,ring-opening polymerization (SI-ROP)of 1,5-dioxepan-2-one (DXO).The SI-ROP of DXO was achieved by heating a mixture of Sn(Oct)_2,DXO,and the SAM-coated substrate in anhydrous toluene at 55 deg C.The resulting PDXO film was quite uniform.The PDXO film was characterized by polarized infrared external reflectance spectroscopy,X-ray photoelectron spectroscopy,time-of-flight secondary ion mass spectrometry,atomic force microscopy,ellipsometry,and contact angle goniometry.