Effects of gamma-irradiation on UHMWPE/MWNT nanocomposites

摘要: Abstract Ultra high molecular weight polyethylene (UHMWPE) is a polymer that widely used in industrial and orthopaedic applications. In this work, pristine multiwalled carbon nanotubes (MWCNTs) were incorporated into UHMWPE different concentrations (1, 3 5 wt.%) using ball milling process. UHMWPE/MWCNT nanocomposites gamma irradiated at 90 kGy to improve the interaction between MWCNTs matrix. Structural, thermal mechanical characterizations conducted by means of transmission electron microscopy (TEM), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA) uniaxial tensile techniques. Gamma irradiation produced an increase melting temperature, crystallinity temperature maximum decomposition rate. The 38% decrease toughness neat UHMWPE. incorporation did not significantly affect point but decreased degree raw UHMWPE, which was related reduction lamellar density. An stability also observed for compared tests showed Young’s modulus reinforced small (5%). increased crystallinity, thickness, improved their stability. up 71% no significant changes comparison with non-irradiated nanocomposites. reduced negative effects compensated toughness. This fact might be attributed radical scavenger behaviour MWNT as proved Electron Spin Resonance (ESR) detection radiation-induced radicals.