The polystyrene-polydimethylsiloxane copolymer (PS-b-PDMS) was grafted from the surface of polyethylene terephthalate (PET) film via surface-initiated atom transfer radical polymerization (SI-ATRP).The ATRP was carried out at 90 ℃ in the presence of CuCl as a catalyst

2

2-bpy as a complexing agent

and toluene as a reaction medium.The influences of different reaction times on the surface composition

structures

morphology and properties of polyester films were studied.X-ray photoelectron spectroscopy (XPS)

Fourier transform infrared spectroscopy (FTIR/ATR)

scanning electron microscopy (SEM) were used to characterize the surface composition

structure and morphology of modified polyester film.And the results could confirm the successfully grafting of initiators and polymers from the surface of PET films.The wettability and effect on bacterial adhesion of modified PET films were measured by contact angle and microbial adhesion tests.The data of contact angle showed that the surface properties of PET films were related to the reaction time.The grafting density and contact angle of PET films increased as the reaction time inereased.It suggests that the SI-ATRP is a living radical polymerization.Further more

the grafting rate was up to 0.72 mg/cm2

and the contact angle increased to 126 when the polymerization time was 12 h

meanwhile

the amount of bacterial adhesion was significantly reduced.