On The Strain Sensing of EVA/MWCNT Composite

Abstract

In this paper, the potential of using ethylene-vinyl acetate (EVA) filled with multi-wall carbon nanotubes (MWCNT) composites for strain sensing was investigated. Stress relaxation experiments were conducted on injection-molded samples, and the stress and electrical resistance were measured in situ during the relaxation process. Based on the experimental results, it was found that the electrical resistance of the EVA/MWCNT composite increases with increasing strain, and exponentially decreases with relaxation time, indicating the capacitive behavior of MWCNTs. The maximum electrical conductivity of 7.35�10-4 S/cm was obtained for the EVA/MWCNT composite with 5 wt.% at 180�C, whereas higher piezo-resistive sensitivity was obtained for the composite with 3 wt.%. The electrical percolation threshold was found to increase from 0.223 wt.% at 140�C to 0.994 wt.% at 180�C.

Fine Details Obtained by 3D Printing and Using Polymers

“…The experimental results were processed by means of a software based on the method of least squares [6][7], in order to establish empirical mathematical models able to highlight the influence exerted by the value of the sharp angle α of surfaces intersections and by the diameter d of the nozzle orifice on the height h of the triangles obtained by 3D printing. The software was elaborated in the Department of Machine Manufacturing Department of the Gheorghe Asachi Technical University of Ia'i and it offered the possibility to select an adequate model for the experimental results, among some distinct mathematical models.…”

Pre-compliance testing of the shielding effectiveness of 3D printed multiwall carbon nanotube/ethylene-vinyl acetate copolymer composites in the 1 – 7 GHz range

“…The development of flexible electronic devices requires the use of EMI shielding materials with high flexibility, and attempts have been made to develop flexible polymer-based nanocomposites for such applications [10,[13][14][15][18][19]. Because of their high flexibility and low processing temperature, ethylene-vinyl acetate copolymer/CNT composites [28][29][30] are a good candidate for constructing flexible interface shielding structures. However, the SE of the EVA/CNT composites has not been investigated.…”