Synthesis and application of oligomers of poly(fluorenylene vinylene) / Síntese e aplicação de oligômeros de poli(fluorenilenovinileno)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

There is a growing interest in investigating the phenomenon of magnetoresistance in various materials (both organic and inorganic), since it is directly linked to the manufacture of high capacity hard disk drives. Previous studies showed that the polymer PDO14FV presents magnetoresistance with higher intensity than inorganic materials. Therefore, this work consisted in the synthesis and characterization of two oligomers, the dimer (DO14FV-dim) and trimer (DO14FV-trim), of this polymer and the investigation of magnetoresistance in these materials. Surprisingly, these oligomers presented higher magnetoresistance than that exhibited by the polymer. These results may contribute in future works aiming the elucidation of the mechanism of this phenomenon in organic materials. The synthesis of the oligomers was performed by Wittig reaction. Molecules of well defined structure and trans configuration were obtained and characterized by spectroscopic methods. Aiming other applications, the oligomers and polymer were tested in gas sensors, for the discrimination between different types and brands of tea. It was observed that the greater the molecule, the greater the selectivity, and therefore, the polymer gave the best results.

ASSUNTO(S)

magnetoresistance poly(fluorenylenevinylene) sensor de gás poli(fluorenilenovinileno) gas sensors síntese orgânica magnetorresistência organic synthesis polímeros condutores conducting polymers

ACESSO AO ARTIGO

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