Abstract
The effects of singlet oxygen generated by photoexcitation of fullerenes on the polystyrene-block-polybutadiene-block-polystyrene(SBS) were investigated. The SBS was mixed with the fullerene by using a roller mill and then the samples were exposed to ultraviolet (UV) irradiation. The surface arears of SBS containing the fullerene were cured by UV irradiation. From result of Fourier transform infrared spectroscopy (FT-IR), it was found that the cross-linking reaction via ene-reaction between the polybutadiene chains and singlet oxygen was occurred by the UV irradiation with a maximum wavelength of 312 nm, whereas general auto-oxidation reaction of the polybutadiene proceeded due to exposure to the UV irradiation with both 254 nm and 312 nm. The results of extraction test by toluene , differential scanning calorimeter (DSC) measurement and dynamic mechanical analysis (DMA) for the irradiated samples indicated that the cross-linking reaction of the polybutadiene chain occurred on the only surface area of samples at the content above 1,000 ppmW/W of C60 by the UV (312 nm) irradiation.
