Keywords: polyaniline nanofibres, PMMA composites, low radiation, self-assembly, carbon nanotubes seeding, ultrasound, stabilisation, viscosity, gamma irradiation, nanotechnology, nanofibre composites
Effects of gamma irradiation on PMMA/polyaniline nanofibre composites
Polyaniline (PANI) presents promising antioxidant and radical-scavenging properties. Substances having these characteristics are good candidates for radioprotecting agents. In this work, nanofibres of polyaniline emeraldine doped with (?)-camphor-10-sulfonic acid (PANI-(?)-CSA) were prepared by self-assembly method under 'silent' and sonochemical conditions. PANI emeraldine base (PANI-EB) nanofibres were obtained after dedoping with NH4OH and were used as additives in films of commercial PMMA, in order to investigate radiostabilising effects on the PMMA matrix. Films containing aniline (An) and PANI-EB grains were also prepared for comparison. Variations in viscosity-average molar mass (Mv) at a 25 kGy dose showed that samples containing aniline, PANI-EB nanofibres or grains in amounts of 0.15% (wt/wt) underwent less degradation than the control sample. In addition, PMMA/PANI-EB nanofibres and PMMA/An at 0.15% (wt/wt) showed a smaller number of scissions per original molecule (α) than control samples in the 25?75 kGy dose range. Spectroscopic characterisation (FTIR, UV-Vis) and scanning electron microscopy (SEM) of PANI samples were also performed.