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Química Nova

versão impressa ISSN 0100-4042versão On-line ISSN 1678-7064

Resumo

FECHINE, Guilhermino José Macêdo; SANTOS, João Antônio Belmino dos  e  RABELLO, Marcelo Silveira. The evaluation of polyolefin photodegradation with natural and artificial exposure. Quím. Nova [online]. 2006, vol.29, n.4, pp.674-680. ISSN 1678-7064.  https://doi.org/10.1590/S0100-40422006000400009.

Samples of polypropylene (PP) and low-density polyethylene (LDPE) were submitted to ultraviolet radiation, in the natural environment and also in the laboratory. Chemical modifications were quantified by the carbonyl index (CI), mechanical properties and melt flow index. The degradation in the laboratory was comparatively faster than in the environment for both types of polymers. The accelerating factor was determined for the various properties investigated. This parameter, however, showed a large variation with the degradation criteria and the type of polymer. The existence of a "universal accelerating factor", therefore, was not observed in the current study.

Palavras-chave : polypropylene; low-density polyethylene; photodegradation.

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