Electropolymerizable ionic liquids

Author(s)

Fernando Reinoldo Scremin

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ)
• Defense date: 2013-10-18

Examining board members

Roberto Manuel Torresi; Rômulo Augusto Ando; Pablo Alejandro Fiorito; Carla Maria Nascimento Polo da Fonseca; Paulo Teng An Sumodjo

• Advisor: Roberto Manuel Torresi

Abstract

Electropolymerizable lonic liquids have groups that are susceptible to electropolymerization bounded either to the cationic or anionic structure. In such cases, the ionic species can be immobilized into a polymeric matrix. This work presents the synthesis of an electropolymerizable ionic liquid in which aniline was inserted as the eletrocpolymerizable group in methyl-imidazolium. Several methods were tested for the electropolymerization, involving the use of organic solvents or ionic liquids as electrolytes. The copolymerization with aniline units was effective to obtain polyrnenc films in the presence of the synthesized monomer. The influence of the monomer in the copolymer was studied with respect to the electrochemical behavior, showing the increasing of the polymer electroactivity in aprotic ionic liquid electrolyte. The presence of the monomer produces more compact films than polyaniline which presents a dendritic morphology. The spectroeletrochemical processes for the copolymer do not suffer lag in relation to electrochemical processes as observed in polyaniline. The redox processes were monitored by EQCM-D demonstrating that the charge compensation takes place from the flow of cations. The presence of the synthesized monomer in the copolymer affects the behavior of polyaniline, as well as any substituent in the aniline, however the copolymer shows intrinsic properties of ionic liquids, demonstrating the formation of a multifunctional material (AU)

• FAPESP's process: 07/07228-6 - Electro-polimerization of ionic liquids
• Grantee: Fernando Reinoldo Scremin
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)