The effect of compressive stress on the electrically resistivity of poly(vinylidene fluoride)/polypyrrole blends

被引:17
作者
Merlini, Claudia [1 ,2 ]
de Oliveira Barra, Guilherme Mariz [1 ]
Araujo, Thiago Medeiros [2 ]
Pegoretti, Alessandro [2 ]
机构
[1] Fed Univ Santa Catarina UFSC, Dept Mech Engn, Florianopolis, SC, Brazil
[2] Univ Trento, Dept Ind Engn, I-38123 Trento, Italy
关键词
Pressure sensor; Polypyrrole; Poly(vinylidene fluoride); Conducting blends; POLYMER BLENDS; PRESSURE; POLYPYRROLE; COMPOSITES; BEHAVIOR; RUBBER; CONDUCTIVITY; POLYANILINE; NANOFIBERS; FLUORIDE);
D O I
10.1016/j.synthmet.2014.08.002
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Variation of the electrical resistivity under repeated loading-unloading compressive cycles of poly(vinylidene fluoride) (PVDF)/polypyrrole (PPy) blends prepared by solution-casting has been investigated. The insulator-conductor transition of the PVDF/PPy blends was very sharp and the percolation threshold was found to be below 4 wt%. PVDF/PPy blends exhibits a decrease in the electrical resistivity with the applied compressive stress due to the formation of new conducting pathways. Electromechanical response was dependent of PPy amount and the maximum sensitivity was obtained for a blend with a PPy content of 9 wt%, for which the electrical resistivity drops by two orders of magnitude, e.g. from 10(8) to 10(6) Omega cm. The electrical resistivity variation during compressive stress cycles, the reproducibility and the reversibility makes this system a suitable material for the development of pressure sensors. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:186 / 192
页数:7
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