The influence of preparation method of OC1OC6-PPV films on the photo-oxidation process |
| |
| Authors: | Clarissa A Olivati Rodrigo F Bianchi Osvaldo N Oliveira Jr |
| |
| Institution: | a Depto. de Física, Química e Biologia, Faculdade de Ciências e Tecnologia, Universidade Estadual Paulista, CP 467, 19060-900, Presidente Prudente/SP, Brazil
b Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970, São Carlos/SP, Brazil |
| |
| 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 (OC1OC6-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. |
| |
| Keywords: | PPV derivative Photodegradation Langmuir-Blodgett films Cast films |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
