Avaliação da fotodegradação de poliolefinas através de exposição natural e artificial

Química Nova

Guilhermino José Macêdo Fechine²  João Antônio Belmino Dos Santos¹  Marcelo Silveira Rabello¹ 

[1] ,Universidade de São Paulo Instituto de Química São Paulo SP ,Brasil

关键词: polypropylene;    low-density polyethylene;    photodegradation;   

DOI  :  10.1590/S0100-40422006000400009

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License