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The influence of high-energy e-beam treatment at atmospheric pressure on the structure and photocatalytic activity of TiO 2 was examined. Using an e-beam energy of 1 MeV and exposure in the range of 5-15 kGy, an improvement in the photocatalytic activity of TiO 2 was observed. An increase in the population of C-O bonds was found in the C and O 1s states using X-ray Photoelectron Spectroscopy (XPS) suggesting that the change in the structure of the C impurities on the surface of TiO 2 is closely related to the variation in the photocatalytic activity.

A new method for the tuning and enhancing photoluminescence (PL) characteristics of light emitting poly (3‐methylthiopnehe) (P3MT) nanotubes through E‐beam irradiation under atmospheric environments is reported. An E‐beam generated from a linear electron accelerator (1 MeV, 1.6 × 1013–8.0 × 1016 electrons cm–2) is irradiated onto P3MT nanotubes including an Al2O3 template. From laser confocal microscope (LCM) PL experiments, significant enhancements in the PL intensity—up to about 90 times of an isolated single strand of the E‐beam irradiated P3MT nanotubes—are observed. The luminescent color of the P3MT nanotubes changes from green to red color depending on the variation of E‐beam dosage. These results might originate from the de‐doping effect and the conformational modification through E‐beam irradiations. Conformational changes of the E‐beam irradiated P3MT nanotubes are confirmed by LCM single Raman and ultraviolet‐visible (UV/Vis) absorption spectra. From UV/Vis absorption spectra, it is observed that the π–π* transition peak and the doping induced bipolaron peaks of the P3MT nanotubes dramatically vary with E‐beam irradiating conditions.

In this study, the curing behavior of polycardanol containing epoxy groups (diepoxidized polycardanol) was exploited in terms of thermal stability and the cure reaction conversion by means of thermogravimetric analysis and Fourier-transform infrared spectroscopy, respectively. The effect of photo-initiator type and concentration and electron beam absorption dose in the presence of cationic photo-initiators (triarylsulfonium hexafluorophosphate (P-type) and triarylsulfonium hexafluoroantimanate (Sb-type) on the cure behavior of diepoxidized cardanol (DEC) resin was investigated. The thermal stability of DEC with Sb-type photo-initiator was higher than that with P-type one, being increased with increasing the concentration and electron beam absorption dose. The conversion of cure reaction was gradually increased with increasing the dose, showing the maximum at 800 kGy. The results revealed that Sb-type photo-initiator, the concentration of 2 or 3 wt %, and electron beam absorption dose of about 800 kGy may be preferable for initiating epoxy ring opening in the DEC molecules as well as for efficiently curing the DEC resin by electron beam irradiation. V C 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41599.

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