PVDF-PAni blend: a free-standing film with variable electrical resistance

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Author(s):	Sousa, E. A. ; Deniz, W. D. S. ; Arlindo, E. P. S. ; Sakamoto, W. K. ; Fuzari, Jr., G. C. Total Authors: 5
Document type:	Journal article
Source:	POLYMER BULLETIN; v. 74, n. 5, p. 1483-1492, MAY 2017.
Web of Science Citations:	0
Abstract
Films made of a blend of polyaniline (PAni) and a nonpolar polyvinylidene fluoride (PVDF) polymer matrix were obtained by the mechanical mixing of both, with subsequent melting and quenching. Using the current versus voltage (IxV) measurements, the percolation threshold (concentration in which some conducting particles are connected to form at least one conductor path, related to one direction of the film) was determined to be between 40 and 45 % in volume along the surface. Related to the film thickness, a small amount of PAni (0.5 % in volume) was enough to transform the blend in a conducting material. Strain-stress tests indicated that a small amount of PAni can reinforce the polymer matrix. Furthermore, the immiscible blend obtained changes in its electrical conductivity, according to the pH of the solution in which it was immersed, indicating the possibility of the real application of that material as a resistor with variable electrical resistance. (AU)

FAPESP's process:	13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:	Elson Longo da Silva
Support type:	Research Grants - Research, Innovation and Dissemination Centers - RIDC