Thermal, mechanical and electromagnetic properties of LLDPE/PANI composites
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2017
Autores
Passador, Fabio R. [UNIFESP]
de Faria, Patrick V. [UNIFESP]
Backes, Eduardo H.
Montanheiro, Thais L. A. [UNIFESP]
Montagna, Larissa S. [UNIFESP]
Pinto, Simone de Souza [UNIFESP]
Pessan, Luiz A.
Rezende, Mirabel C. [UNIFESP]
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Conducting polymers have attracted a great scientific and technological interest due to their interesting properties, particularly its high electrical conductivity. The polyanilines stand out because of the ease of doping with protonic acids and their chemical stability in the doped form. The processability of conducting polymers is a crucial factor in the use of their electrical and electrochemical properties in technological applications. In this work, the processability of linear low-density polyethylene (LLDPE) and polyaniline (PANI) composites was evaluated using a torque rheometer. Composites with different contents of PANI were processed in a torque rheometer and characterized using thermal analysis (DSC), mechanical properties (uniaxial tension), electromagnetic (electrical permittivity, magnetic permeability and reflection loss) measurements and scanning electron microscopy observations. The addition of PANI decreased the crystallinity degree of the LLDPE. On the other hand, the elastic modulus increased. The complex parameters of permittivity and permeability (8.2-12.4 GHz) varied as function of the PANI content in the LLDPE. Reflection loss simulations in the frequency range of 8.2-12.4 GHz showed that the 2.0-mm-LLDPE/PANI sample (60/40 wt%) behaved as a good microwave absorber attenuating the incident electromagnetic wave up to 92%.
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Polymer Bulletin. New York, v. 74, n. 7, p. 2701-2717, 2017.