Flexible composites used as piezoresistive pressure sensors

Toprakçi, Hatice Aylin Karahan; Turgut, Ayşe; Toprakçi, Ozan

doi:10.1016/j.matpr.2021.01.555

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…In that study graphite with the average particle size of 40 µm was used as the conductive filler. Percolation region was reported between 25-35 wt% and 40 wt% graphite filled SEEPS composite was reported to show negative piezoresistance (Karahan Toprakci et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Sustainable, Alternative Conductive Fillers for Flexible Electronics: Investigation of Filler Size on Morphological and Electrical Properties of Styrene-[Ethylene-(Ethylene-Propylene)]-Styrene Block Copolymer (SEEPS) Composites

Cetin

Toprakçi

2022

International Journal of Environment and Geoinformatics

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Sustainability is getting popular for many engineering applications from packaging to textiles, energy to electronics. Since renewable, environmental friendly sources lowers the negative impacts of the end product on ecology, sustainability studies generally start with the raw materials. The sustainability of electronic materials has gained importance because of limited amount of resources and increasing costs as well as environmental restrictions. In this study, pistachio shell waste was used to synthesize conductive fillers for the fabrication of sustainable flexible electronics. Pistachio shell waste was carbonized. After carbonization, two different grounding settings were used to obtain different filler sizes. In order to compare the effects of filler size on electrical and morphological properties of the composites, six different samples were prepared based on filler concentration with styrene-[ethylene-(ethylene-propylene)]-styrene block copolymer. Homogeneous filler distribution and good filler-matrix interface were observed for both composite sets. Filler size was found significant in terms of the electrical conductivity of the composites. For larger fillers, the percolation region was found to shift to lower concentration compared to smaller filler size.

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Section: Introductionmentioning

confidence: 99%

Sustainable, Alternative Conductive Fillers for Flexible Electronics: Investigation of Filler Size on Morphological and Electrical Properties of Styrene-[Ethylene-(Ethylene-Propylene)]-Styrene Block Copolymer (SEEPS) Composites

Cetin

Toprakçi

2022

International Journal of Environment and Geoinformatics

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“…[13][14][15] From the recent literature given above, it is obvious that SEEPS is mostly used as a component of the polymeric systems. However, it can be used alone for the fabrication of fine fibers, 16 conductive polymer composites, 17 pressure sensors, 17 magnetorheological composites 18 with 18 or without extenders. 16,17 Polymeric composites are materials with improved properties those consist of at least one matrix and one filler.…”

Section: Introductionmentioning

confidence: 99%

“…However, it can be used alone for the fabrication of fine fibers, 16 conductive polymer composites, 17 pressure sensors, 17 magnetorheological composites 18 with 18 or without extenders. 16,17 Polymeric composites are materials with improved properties those consist of at least one matrix and one filler. Incorporation of filler into the matrix leads to fabrication of functional materials.…”

Section: Introductionmentioning

confidence: 99%

High Shear Processing of Expanded Vermiculite Filled Polymer Composites: Particle Size Effect on Flexible Composites

Cetin

Toprakçi

Taşkın

et al. 2022

Mat. Sci. Res. India

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Filler dispersion is an important issue for polymer-based composites. Fillers can be dispersed by melt or solution processing methods. Solution-based mixing offers various combinations including ultrasonication, mechanical stirring, or high shear mixing. Planetary high shear mixing is a simple method with high dispersion performance. Dispersion and wetting of the fillers are provided by not only planetary shear movement of the mixer but also by the decrease in viscosity of the polymer phase because of high shear. Although that is advantageous for the dispersion of nanofillers, it might be challenging for the particles that have morphology with loosely bonded layers. To observe the effects of high shear mixing on expanded vermiculite (VMT) filled styrene-[ethylene-(ethylene-propylene)]-styrene (SEEPS) flexible composites, two different VMTs were used with different particle sizes at various VMT ratios from 1 to 30 wt%. Morphological, structural, thermal, mechanical properties, flame spread character of the composites, and viscosity of the solutions were analyzed. From morphological analysis, high shear mixing was found to be effective in terms of decreasing particle size and filler dispersion. While mechanical properties showed decrease, thermal stability, and flame retardancy of the composites increased. KEYWORDS: expanded vermiculite (VMT); flexible composites; flame retardancy; Planetary high shear mixing; styrene-[ethylene-(ethylene-propylene)]-styrene (SEEPS); thermoplastic elastomer

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Electrospun Mats of Thermoplastic Polyurethane and Carbon Nanotubes with Piezoresistive Behavior

de Sousa,

Barra,

Martins

et al. 2024

Macromolecular Symposia

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Electromechanical sensors obtained by electrospun mats have a high surface area and porosity, allowing superior flexibility and sensitivity of response to the sensor. Based on this context, in this work, electrospun mats based on thermoplastic polyurethane (TPU) and multi‐wall carbon nanotubes (MWCNTs) are produced by electrospinning. The electrical resistivity under different compressive stress levels is evaluated in recurring loading and unloading cycles. Incorporating MWCNT increases the elastic modulus and thermal stability but does not significantly increase the electrical conductivity. However, the electrospun mats with different concentrations of MWCNT show variation in electrical resistivity under compressive stress. The response is stable with a compressive stress of 0.25 MPa and five cycles of compression and decompression, with a variation in the relative resistivity of approximately −0.8 for all MWCNT concentrations. A similar response is observed with the increasing of the compressive stress to 0.5 MPa.

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Flexible composites used as piezoresistive pressure sensors

Cited by 3 publications

References 3 publications

Sustainable, Alternative Conductive Fillers for Flexible Electronics: Investigation of Filler Size on Morphological and Electrical Properties of Styrene-[Ethylene-(Ethylene-Propylene)]-Styrene Block Copolymer (SEEPS) Composites

Sustainable, Alternative Conductive Fillers for Flexible Electronics: Investigation of Filler Size on Morphological and Electrical Properties of Styrene-[Ethylene-(Ethylene-Propylene)]-Styrene Block Copolymer (SEEPS) Composites

High Shear Processing of Expanded Vermiculite Filled Polymer Composites: Particle Size Effect on Flexible Composites

Electrospun Mats of Thermoplastic Polyurethane and Carbon Nanotubes with Piezoresistive Behavior

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