FotodegradaÃÃo e efeito combinado da radiaÃÃo gama/biodegradaÃÃo em blendas polietileno/amido

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The polymeric blends composed by synthetic and natural polymers, as the starch, come deverving prominence in the development of new materials for presenting similar properties to synthetic polymers, and greater easiness of degrading when exposed to microorganisms in the environment, when they are discarded. The current work had for objective to evaluate of the biodegrading capacity of a mixed culture of Phanerochaete chrysosporium and Talaromyces wortmannii fungi, during 90 days of exposure, through the Sturm test, for the accompaniment of CO2 produced, in a blend composed by low density polyethylene (LDPE) and starch, when these were previously sterilized through the gamma radiation. Also evaluated the effect of the exposure to the ultraviolet light in the times of 6, 24, 48, 60 and 72 hours in polymeric blend. The photodegradation, biodegradation and gamma degradation had been evaluated by mechanical properties, scanning electron microscopy (SEM), Fourier Transformed infrared spectroscopy (FTIR), X-ray diffraction and change mass. The results had proven the degradation of blends by the UV and gamma irradiation, by the formation of carbonyl and vinyl groups in its chemical structure, and loss of mechanical properties. The increasing and gradual consumption of blend for the culture of fungus, as alternative source of carbon, was evident in the accompaniment of the CO2 produced. The effect combining gamma radiation and the exposition to the culture of fungus, in polymeric blends, was favored when compared with the blends that had suffered only the exposition to the fungus

ASSUNTO(S)

engenharia quimica amido radiaÃÃo gama e biodegradaÃÃo polyethylene biodegradation fotodegradaÃÃo starch polietileno photodegradation blend blenda gamma radiation

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