The evaluation of polyolefin photodegradation with natural and artificial exposure

Química Nova

Universidade de São Paulo, São Paulo, Brasil¹  Universidade Federal de Campina Grande, Campina Grande, Brasil¹  Santos, João Antônio Belmino dos¹  Fechine, Guilhermino José Macêdo¹  Rabello, Marcelo Silveira¹ 

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

DOI  :  10.1590/S0100-40422006000400009

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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】

Unknown