Preparação e caracterização do compósito poli (fluoreto de vinilideno) / polianilina com partículas de níquel

• Ano de defesa: 2014
• Autor(a) principal: Dias, Gabriel da Cruz [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Polimeros; Polimeros condutores; Compositos polimericos; Niquel; Magnetismo; Polimeros - Propriedades eletricas; Polymers
• Link de acesso: http://hdl.handle.net/11449/113849

Conductors composites associate at conductors polymers with electrical and magnetic properties and metal particles with mechanical properties and processability of polymers conventional due the versatility and potential for technological applications, have been emphasized to researchers. In this work, composite PVDF/Pani/Ni magnetic properties were obtained by physical mixing the nickel particles and power resulting from synthesis of blend PVDF/Pani. Homogeneous films were obtained by hot pressing at a temperature 180°C and pressure 30 MPa. The thermogravimetric analysis of composites showed that they presented a good thermal stability with little weight lost to 300°C. The analysis scanning electron microscope with energy dispersive X-ray analysis confirmed the presence to Nickel particles in the end product and with the analysis by differential scanning calorimetry showed that the presence thereof did not change the conformational and configuration structure the polymer matrix preserving the characteristic peaks of α phase PVDF. The electrical conductivity PVDF/Ni composites and PVDF/Pani/Ni undoped, to the content of nickel particles showed percolation threshold between 15 and 20% with a range 7 and 5 orders of magnitude, respectively, reaching values near to nickel particles (10-4 S/cm). For redoped composite increasing content particles caused a decrease in the magnitude electrical conductivity 10-3 to 10-4 S/cm. The stress-strain tests showed that the presence of particles causes impoverishment in the mechanical properties to composite with decreasing resistance to deformation and rupture, as the conductor with insulating state. The magnetic analysis showed that the materials before pure changed to diamagnetic behavior and with the incorporation of particles are showed a ferromagnetic behavior. Analyses of reflectivity/absorption electromagnetic showed an increase of potency absorbed and reflected with increasing conductive ...