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Materials Research

versão impressa ISSN 1516-1439versão On-line ISSN 1980-5373

Resumo

MORAIS, Frederick Louis Dias de et al. Photodegradation of UHMWPE Filled with Iron Ore Fine. Mat. Res. [online]. 2017, vol.20, n.2, pp.356-364.  Epub 23-Jan-2017. ISSN 1980-5373.  http://dx.doi.org/10.1590/1980-5373-mr-2016-0320.

Ultra high molecular weight polyethylene (UHMWPE) is one of the most important engineering materials owing to outstanding properties like impact strength and abrasion resistance. However, the relatively low Young´s modulus restricts some application and the use of fillers may be a suitable way to overcome this. The fillers can influence the photo stabilization of the compound, as it occurs to other polymers. Neat UHMWPE and its composites with 1 and 10% of iron ore fine were exposed to ultraviolet radiation for up to 33 days and then tested for mechanical properties. The stress-strain behaviour changed with degradation, with an evident necking and strain hardening region that was not observed before exposure, due to a reduction in entanglements density. From the tensile results, the filler may have a protection action against UV, particularly when a loading of 10% was present. Complementary analyses were performed, including X-ray diffraction, DSC and SEM.

Palavras-chave : Iron ore fine; Photodegradation; UHMWPE.

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