Estudo fotofísico entre polímeros conjugados
Data
2021-12-13
Autores
Gashu, Vinícius Massao 
Orientadores
Péres, Laura Oliveira
Tipo
Trabalho de conclusão de curso
Título da Revista
ISSN da Revista
Título de Volume
Resumo
Neste trabalho, sintetizou-se e caracterizou-se os copolímeros poli(4-cloro-fenol)-co-para-fenileno (PPP) e poli[(9,9-dioctilfluoreno)-co-trans-estilbeno (PFSTB), a partir dos quais foi realizado estudos fotofísicos a partir da formação de blendas destes dois copolímeros em diferentes solventes orgânicos. A eficiência dessas blendas pode estar relacionada a processos fotofísicos de transferência de energia que são de grande importância para o estudo do novo sistema formado. Além disso, quando em solução, o empacotamento, orientação e interação molécula-solvente das moléculas pode ser alterado com o uso de diferentes solventes. Assim este fator torna-se essencial para a eficiência do novo sistema a ser formado. Desta forma, este trabalho focou-se em estudar o efeito da polaridade dos solventes nas blendas, os processos fotofísicos de transferência de energia (FRET), a solubilidade e as interações intermoleculares que ocorrem nas blendas formadas. O estudo do efeito da polaridade mostrou que o copolímero PFSTB não é sensível ao efeito da polaridade do solvente e que o copolímero PPP pode ser sensível ao solvente THF. Para o estudo da transferência de energia (FRET), o solvente THF, em teoria, é o solvente mais eficiente na transferência da transferência de energia, pois apresentou maior valor no parâmetro R0. Pelo estudo dos parâmetros de solubilidade foi possível verificar que a ligação de hidrogênio pode ser um fator importante para a sensibilidade do copolímero PPP diante do solvente THF. Com esse estudo, foi possível obter uma maior capacitação nessa área de conhecimento, o que pode abrir um leque para futuras aplicações em diversos materiais para diferentes tipos de dispositivos.
In this work, the copolymers poly(4-chloro-phenol)-co-para-phenylene (PPP) and poly(9,9-dioctylfluorene)-co-trans-stilbene (PFSTB) were synthesized and characterized. Blends were prepared with the two copolymers for photophysical studies in different organic solvents. The efficiency of these blends could be related to the photophysical process of energy transfer, which is of great importance for the study of the new generated system. Furthermore, when in solution, the packing effects, molecules orientation, and molecule-solvent interactions might modify with different organic solvents. These factors are essential for the understanding of the new system. Therefore, the focus of this work was to study the polarity solvent effect, the photophysical process of energy transfer (FRET), the solubility, and the intermolecular interaction that occurs in these blends. A study of the polarity solvent effect showed that the PFSTB copolymer wasn’t sensible with the polarity change of the solvents, and the PPP copolymer might be sensible with the THF solvent. The FRET study showed, that the THF solvent was more efficient due to the higher Ro value. With the solubility parameters study, it was noticed that the hydrogen bonds might be an important factor to the PPP copolymer’s sensibility to the THF solvent. In this study, it was possible to improve the photophysics and polymer knowledge, which is important for future applications in materials for different devices.
In this work, the copolymers poly(4-chloro-phenol)-co-para-phenylene (PPP) and poly(9,9-dioctylfluorene)-co-trans-stilbene (PFSTB) were synthesized and characterized. Blends were prepared with the two copolymers for photophysical studies in different organic solvents. The efficiency of these blends could be related to the photophysical process of energy transfer, which is of great importance for the study of the new generated system. Furthermore, when in solution, the packing effects, molecules orientation, and molecule-solvent interactions might modify with different organic solvents. These factors are essential for the understanding of the new system. Therefore, the focus of this work was to study the polarity solvent effect, the photophysical process of energy transfer (FRET), the solubility, and the intermolecular interaction that occurs in these blends. A study of the polarity solvent effect showed that the PFSTB copolymer wasn’t sensible with the polarity change of the solvents, and the PPP copolymer might be sensible with the THF solvent. The FRET study showed, that the THF solvent was more efficient due to the higher Ro value. With the solubility parameters study, it was noticed that the hydrogen bonds might be an important factor to the PPP copolymer’s sensibility to the THF solvent. In this study, it was possible to improve the photophysics and polymer knowledge, which is important for future applications in materials for different devices.