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Master's Dissertation
DOI
https://doi.org/10.11606/D.54.1987.tde-15042014-104053
Document
Author
Full name
Neri Alves
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1987
Supervisor
Committee
Ferreira, Guilherme Fontes Leal
Gupta, Hari Mohan
Sanches, Rosemary
Title in Portuguese
Transiente de corrente elétrica em amostras de PVDF devido a água de volume
Keywords in Portuguese
Absorção de água
Efeitos de polarização
Polímeros isolantes
Abstract in Portuguese
Uma condutividade evanescente, dependente do tempo, tem sido detectada nos filmes de PVDF da BembergFolien. Após muitos ciclos de polarização e despolarização, a corrente de absorção torna-se fortemente reduzida, para o mesmo nível das correntes de despolarização. Esta condutividade é facilmente observada, aparecendo na corrente de polarização pela aplicação de altos campos. É observada recuperação em amostras deixadas em atmosfera úmida. Nós interpretamos estas observações como sendo uma limpeza, pelo campo elétrico, dos íons gerados por uma acentuação da dissociação de moléculas de água absorvida no volume, pela ação deste campo.
Title in English
Transient of electric current of PVDF films due to water molecules
Keywords in English
Insulating polymers
Polarization effect
Water absorption
Abstract in English
A time dependent evanescent conductivity has been detected in BembergFoliem PVDF films. After many polarization-depolarization cycles, the absorption current became strongly reduced, to the same level as the depolarization one. It is easily seen at higher fields by a bump appearing in the polarization current Recovering is observed in samples left in humid atmosphere. We have interpreted these observations as an electric field ion cleaning of an electric field enhanced dissociation of bulk absorbed water molecules.
 
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NeriAlvesM.pdf (2.42 Mbytes)
Publishing Date
2014-04-16
 
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