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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2008.tde-13082008-094925
Document
Author
Full name
Dayana Luiza Martins Bazani
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Andrade, Adnei Melges de (President)
Paterno, Leonardo Giordano
Seabra, Antonio Carlos
Title in Portuguese
Caracterização de polímeros semicondutores para o uso em sensores de radiação gama.
Keywords in Portuguese
Dispositivos eletrônicos
Dosímetros
Polímeros (materiais)
Processos de fabricação
Abstract in Portuguese
Este trabalho tem por objetivo investigar as propriedades ópticas de sistemas poliméricos luminescentes submetidos a diferentes doses de radiação gama. Foram preparadas soluções de poli[2-metóxi-5-(2'etil-hexilóxi)-p-fenilenovinileno] - MEHPPV em clorofórmio e filmes finos depositados a partir de soluções deste polímero sobre substrato de vidro. As soluções e filmes finos tiveram suas propriedades investigadas por meio de medidas de absorção ultravioleta-visível (UV-VIS). Os filmes finos também foram analisados por medidas de espectroscopia de infravermelho (FTIR) além da cromatografia HPSEC. Os resultados experimentais foram analisados buscando elucidar tanto os efeitos da radiação nas propriedades ópticas dos polímeros, como também o estudo da viabilidade destes materiais como elementos ativos de dosímetros para baixas doses de radiação gama (< 1 kGy) especialmente para aplicações no tratamento de esterilização de bolsas de sangue (~ 25 Gy) e altas doses de radiação gama (até 25 kGy) para aplicações como esterilização de materiais médicos hospitalares.
Title in English
Characterization of semiconductor polymers for use in gamma radiation sensors.
Keywords in English
Dosimeters
Electronic devices
Fabrication process
Polymers (materials)
Abstract in English
This work aims the investigation of the optical properties of luminescent polymeric systems when submitted to different gamma radiation doses. Solutions of poly[2-methoxi-5-(2'etil-hexiloxi)-p-phenilenevinilene] - MEH-PPV in chloroform were prepared. From those solutions, thin film layers of MEH-PPV were deposited on glass substrates. The polymer solutions and the thin-film samples of MEHPPV had their properties investigated by ultraviolet-visible (UV-Vis) absorption spectroscopy. The thin-film prepared samples were, additionally, investigated by InfraRed Fourier Transform (FTIR) spectroscopy and HPSEC chromatography. The experimental results were investigated to elucidate the radiation effects on the optical properties of these polymeric systems. From the experimental results, the feasibility of using this material as active element in gamma radiation dosimeters was investigated. The research was conducted aiming the low dose gamma radiation (< 1 kGy) specifically for application in the sterilization treatment of blood bags (~ 25 Gy) and high gamma radiation doses (up to 25 kGy) as used for the sterilization of medical and hospital supplies.
 
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Publishing Date
2008-08-21
 
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