Changes in the optical energy gap and ESR spectra of proton-irradiated unplasticized PVC copolymer and its possible use in radiation dosimetry

Changes of surface chemical structure and composition of phenolphthalein poly(ether sulfone) in different radiations

“…Compared with the IR spectrum of PES-C before irradiation, the characteristic bands of PES-C at 1770 cm −1 (υsC O), 1242 cm −1 (δasC-O-C), 1150 cm −1 (υsO S O), and the bands between 1600 and 1450 cm −1 (C C stretching vibration in phenyl) were dramatically reduced after electron and atomic oxygen irradiation, which indicated that the molecular chain of PES-C was destroyed to some extent. [5,12,13] As to the destruction of PES-C molecular chain by irradiation, similar results have been found in our previous studies. [14] The destruction of the main chain may be evidenced by the reduction of the absorption peak at 1150 cm −1 as the O S O bonds only existed in the main chain, while the destruction of the side chain can be seen from the reduction of the absorption peaks at 1770 and 1242 cm −1 .…”

“…Abdel-Fattah et al [5] studied the effects of proton irradiation on PVC and found that proton irradiation induced the occurrence of dehydrochloride and the formation of C C. Gao et al [6] investigated the chemical composition of proton-irradiated epoxy resin and found an increase in C content in contrast to the nonirradiated one. Mishra et al [7] investigated polytetrafluoroethylene (PTFE) irradiated by electrons and found that new groups of -COF and -CF CF2 were formed after the irradiation.…”

Effects of atomic oxygen irradiation on the surface properties of phenolphthalein poly(ether sulfone)

“…1 gives the FTIR spectra of PES-C surface before and after AO irradiation. It is clear that after 8 h AO irradiation, the intensities of these bands at 1770 cm À1 (yC O), 1242 cm À1 (dasC-O-C), 1150 cm À1 (ysO S O) and 1488 cm À1 (yC C) were reduced dramatically indicating the molecular chain of PES-C was destroyed to some extent [16][17][18]. As to the destruction of PES-C molecular chain by irradiation, similar results have been found in our previous studies [19].…”

Photoluminescence and optical properties of He ion bombarded ultra-high molecular weight polyethylene

“…It is also seen that the effect of He ion bombardment on UHMWPE polymer, results in shifting from UV-vis towards longer wavelengths for all polymer samples bombarded with He ions. Such a shift can be attributed to formation of multiple conjugated -C C-bonds [24,25] during the ion bombardment. It is well known that, bombardment of polymers by energetic ions where the electronic stopping power is high (i.e.…”