1. The influence of preparation method of OC1OC6-PPV films on the photo-oxidation process
- Author
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Osvaldo N. Oliveira, Clarissa de Almeida Olivati, Rodrigo Fernando Bianchi, Débora Terezia Balogh, Roberto Mendonça Faria, and Marystela Ferreira
- Subjects
chemistry.chemical_classification ,Materials science ,Polymers and Plastics ,Double bond ,Diffusion ,Derivative ,Polymer ,Condensed Matter Physics ,Photochemistry ,Cast films ,Langmuire blodgett films ,chemistry ,Mechanics of Materials ,Phenylene ,Photodegradation ,Polymer chemistry ,Materials Chemistry ,Degradation (geology) ,Fourier transform infrared spectroscopy ,Bond cleavage - 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 Langmuir–Blodgett (LB) films are less degraded than cast films of a PPV derivative (OC 1 OC 6 -PPV). Both films had similar thickness (∼50 nm) to allow for a more realistic comparison. Degradation was monitored with UV–vis 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.
- Published
- 2006
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