The influence of preparation method of OC1OC6-PPV films on the photo-oxidation process.
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Date
2006
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Abstract
Poly( p-phenylene vinylene) (PPV) derivatives are well known for their applications in polymer light emitting diodes (PLEDs). PPV derivatives are highly susceptible to photo-oxidation though, which is mainly caused by the scission of the vinyl double bond on the polymer backbone. In this work, we show that LangmuireBlodgett (LB) films are less degraded than cast films of a PPV derivative (OC1OC6-PPV). Both films had similar thickness (w50 nm) to allow for a more realistic comparison. Degradation was monitored with UVevis and FTIR spectroscopies. The results indicated that cast films were completely degraded in ca. 400 min, while LB took longer time, i.e. about four times the values for the cast films. The differences can be attributed to the more compact morphology in the LB than in the cast films. With a compact morphology the diffusion of oxygen in the LB film is hampered and this causes a delay in the degradation process.
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Keywords
Derivative, Photodegradation, Langmuire blodgett films, Cast films
Citation
OLIVATI, C. de A. The influence of preparation method of OC1OC6-PPV films on the photo-oxidation process. Polymer Degradation and Stability, v. 91, p. 2342-2346, 2006. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0141391006001200>. Acesso em: 23 fev. 2015.