Optical, chemical and structural modification of oxygen irradiated PET

Influence of SHI upon nanohole free volume and micro scale level surface modifications of polyethyleneterephthalate polymer films

“…The shift in absorption band is associated to the π-π * electronic transitions in the studied wavelength region [48]. Similar results of shift in the absorption edge towards higher wavelength are reported on oxygen ions and gamma rays irradiated PET polymer in the literature [49,50].…”

“…The calculated values of E g for pristine as well as irradiated samples are given in Table 1. The E g value for pristine sample is 3.90 eV which is in close agreement with the values calculated by other groups in the literature [57,49,25]. The number of carbon atoms per conjugation length (N) was calculated by using following equation given by Fink et al [58,59].…”

Gamma irradiation induced chemical and structural modifications in PM-355 polymeric nuclear track detector film

“…The intensity of Raman band at 1124 cm À1 is higher than the pristine film. The enhancement in Raman band intensities after irradiation was reported by various authors [28,29]. They suggested that this may be due to the carbonization of the track area and nucleation of the carbonrich clusters.…”

Enhancement of osseointegration of polyethylene terephthalate artificial ligament by coating of silk fibroin and depositing of hydroxyapatite

“…It can be seen in Figure 2 that the PET ligament displayed a typical PET FTIR spectrum, in which 1,025 cm -1 is assigned to =CH bending vibration in-plane of benzene, 1,107 cm -1 to C-O-C symmetric stretching vibration, 1,271 cm -1 to C-O asymmetric stretching vibration, 1,435 cm -1 to C=C stretching vibration of benzene, and 1,720 cm -1 to -C=O stretching vibration. 32 When SF was immobilized on to PET surface through coating method, absorption bands at 1,623 cm -1 (assigned to amide I of SF β-sheet structure) and 1,520 cm -1 (assigned to the amide II of SF β-sheet structures) showed up (Figure 2), indicating the successful introduction of SF onto the PET surface. 33 A strong peak at 1,050 cm -1 in the FTIR spectrum of PET+SF+HAP was indicative of the ν3 vibrations of PO 4 3-.…”