JULIO HARADA
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Artigo IPEN-doc 28339 Influence of electron beam irradiation on the mechanical properties of pbat/pla polymeric blend2021 - MUNHOZ, PEDRO M.; NASCIMENTO, FERNANDO C.; SILVA, LEONARDO G. de A. e; HARADA, JULIO; CALVO, WILSON A.P.The aim of this research was to evaluate the changes in the mechanical properties of poly(butylene adipate co-terephthalate)/poly(lactic acid) (PBAT/PLA) polymeric blend after the radiation process at different radiation doses. The irradiation was performed in an electron beam accelerator, with 1.5 MeV of energy and 25 mA electric current. The samples were irradiated with doses of 5, 10, 15, 25, 50, 65 and 80 kGy. Both irradiated and non-irradiated samples were characterized by Izod pendulum impact resistance and tensile strength at rupture. The results showed an increase of 44% in relation to Izod impact resistance at a dose of 65 kGy. However, the module of elasticity decreased 56% and tensile strength at rupture decreased 55% at the same radiation dose. In relation to elongation, significant alterations caused by electron beam irradiation was not observed. Therefore, it can be concluded that irradiated blends could be used to make environmentally friendly products, which could absorb impact energy.Artigo IPEN-doc 23652 Effects of carbon black incorporation on morphological, mechanical and thermal properties of biodegradable films2016 - HARADA, JULIO; MACEDO, JOSE R.N.; MACHADO, GLAUSON A.F.; VALENZUELA-DIAZ, FRANCISCO; MOURA, ESPERIDIANA A.B.; ROSA, DERVAL S.This work evaluates the effects of carbon black incorporation on morphological, mechanical and thermal properties of biodegradable films. The biodegradable composite films based on PBAT/PLA blend and PBAT/PLA blend containing 2 wt. % of carbon black were prepared by me lt extrusion, using a twin screw extruder machine and blown extrusion process. The properties of biodegradable film samples were investigated by tensile tests, XRD, MFI, TGA, DSC and FE-SEM analysis and the correlation between properties was discussed.