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Photodegradation study of polystyrene/montmorillonite clay nanocomposite

Grant number: 06/00501-6
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): May 01, 2006
Effective date (End): December 31, 2007
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal researcher:Guilhermino José Macêdo Fechine
Grantee:Camila Fernanda de Paula Oliveira
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:05/00322-1 - Photodegradation and photostabilization of the polymeric blends and composites, AP.JP

Abstract

Polymeric nanocomposites almost are transparent and have higher mechanical properties than conventional plastics. Some nanocomposites can already be found on market, but they still not have named as “nanotechnology product”. Polymeric materials submitted to UV radiation undergo some chemical reactions, which lead to degradation. It is know that, in some application of these materials, it is not desired that they degrade very quickly; however, in other ones, a quicker photodegradation mechanism may be needed. In both situations is necessary knowledge about their photodegradation mechanism, through which one can foresee the shelf life of theese materials. The photodegradation mechanism of most polymers is well known, however, polymeric composites still have few studies concerning them. This work intends to investigate and explain the photodegradation mechanism of polystyrene / montmorillonite clay composites. The samples will be exposed for various irradiation intervals, and their properties like the mechanical, thermal and chemical ones, as well as chemical modifications, molecular weight, etc will be monitored. (AU)

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