SciELO - Scientific Electronic Library Online

 
vol.19 número4Biodegradation Study of a Novel Poly-Caprolactone-Coffee Husk Composite FilmMicrowave Sintering of Aluminum-ZrB2 Composite: Focusing on Microstructure and Mechanical Properties índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Materials Research

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

Resumo

WELLEN, Renate Maria Ramos; CANEDO, Eduardo Luís; RABELLO, Marcelo Silveira  e  FECHINE, Guilhermino José Macêdo. Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate). Mat. Res. [online]. 2016, vol.19, n.4, pp.759-764.  Epub 13-Maio-2016. ISSN 1516-1439.  http://dx.doi.org/10.1590/1980-5373-MR-2015-0666.

The present work is concerned with the photodegradation and photostabilization of poly(3-hydroxybutyrate) (PHB) biopolymer. Two commercial grades of PHB were investigated, containing of 4.0% and 6.2% of hydroxyvalerate (HV) comonomer, named PHB1 and PHB2, respectively. Injection moulded specimens were exposed to ultraviolet radiation (UV-A) in the laboratory for periods of up to 12 weeks and then characterized by tensile testing, surface appearance, size exclusion chromatography (SEC), and scanning electron microscopy (SEM). The exposure to UV radiation caused great damaged on the surface color, reduction of molecular size and mechanical properties. The effects were more pronounced on PHB2, probably due a lighter surface color and less packed macromolecular structure which facilitates the transmission of light throughout the samples. Specimens of PHB1 were also injected with the addition of a UV absorber and antioxidant, resulting in a higher UV stability of PHB, as shown by a low reduction in molar mass and better mechanical properties.

Palavras-chave : Biodegradable polymers; PHB; ultraviolet radiation; photodegradation; photostabilization.

        · texto em Inglês     · Inglês ( pdf )