Mechanical, electrical and electro-mechanical properties of thermoplastic elastomer styrene–butadiene–styrene/multiwall carbon nanotubes composites

Costa, P.; Silva, Jaime; Sencadas, Vítor; Simões, Ricardo; Viana, J. C.; Lanceros‐Méndez, S.

doi:10.1007/s10853-012-6855-7

Cited by 67 publications

(64 citation statements)

References 37 publications

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“…The Young modulus increases with decreasing butadiene in SBS and electrical percolation threshold is similar for the different SBS matrix [14].…”

Section: Introductionmentioning

confidence: 82%

“…From equation (3) it is possible to observe that the GF has a contribution from the intrinsic piezoresistive effect ( In uniaxial stretching mode experiments (method 1) equation 2 was used for the calculation of the GF, using the evolution of the resistance during the stress-strain measurements. In 4-pointbending mode experiments (method 2), the mechanical strain was calculated from the theory of a pure bending plate to a cylindrical surface, valid between the inner loading points, and given by [14]:…”

Section: Electro-mechanical Characterizationmentioning

confidence: 99%

“…The gauge factor (GF) can be tailored by changing CNT concentration or pre-strain to the material, in order to obtain sensors with tailored sensibility [15].…”

Section: Introductionmentioning

confidence: 99%

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Electro-mechanical properties of triblock copolymer styrene–butadiene–styrene/carbon nanotube composites for large deformation sensor applications

Costa

Ferreira

Sencadas

et al. 2013

Sensors and Actuators A: Physical

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“…The Young modulus increases with decreasing butadiene in SBS and electrical percolation threshold is similar for the different SBS matrix [14].…”

Section: Introductionmentioning

confidence: 82%

Section: Electro-mechanical Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Electro-mechanical properties of triblock copolymer styrene–butadiene–styrene/carbon nanotube composites for large deformation sensor applications

Costa

Ferreira

Sencadas

et al. 2013

Sensors and Actuators A: Physical

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“…Therefore, they are used in many different fields, and not least, in the biomedical field [9]. Novel systems have been recently developed adopting polymers instead of the more conventional strain gauges, leading to sensors based on conductive polymers [10], polymer composites [11], polymer elastomers [12], thermoplastics [12], epoxies [13]. As a benefit, sensors based on polymers allow the use of conventional and convenient polymer processing and postprocessing techniques.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of strain sensors based on PEDOT:PSS and silver nanoparticles inks deposited on polymer substrate by inkjet printing

Borghetti

Serpelloni

Sardini

et al. 2016

Sensors and Actuators A: Physical

102

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a b s t r a c tRecently, inkjet printing technology has received growing attention as a method to produce low-cost large-area electronics, sensors, and antennas on polymer substrates. This technology relies on printing techniques to deposit electrically functional materials onto polymer substrates to fabricate electronic components or sensing elements. In this paper, we applied an inkjet printed technology for the development and characterization of films on a polymer substrate aiming at giving design considerations for the optimization of strain sensors or printed electronics obtained by inkjet printing. Two inks were tested over a polyimide substrate, a water-based conductive polymer, PEDOT:PSS, and a silver nanoparticles ink. Their sensing capabilities were investigated under tensile conditions and various strain histories (strain ramp; cyclic loading-unloading tests; application of constant strain over prolonged time) aiming at highlighting the correlation between electrical response, applied strain, time and mechanical histories. Furthermore, the mechanical viscoelastic response of the substrate was investigated under similar strain histories interpreting the results at the light of the substrate deformational characteristics and evaluating its influence.

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“…However, it has been shown that polymer chain alignment during strain hardening is strongly affected by dispersing fillers within the host polymer matrix (8)(9)(10). To account for these observations, one needs to establish the relation between the macroscopically observed strain hardening and the microscopic chain alignment that is affected by the presence of fillers.…”

mentioning

confidence: 99%

Nanoparticle amount, and not size, determines chain alignment and nonlinear hardening in polymer nanocomposites

Varol

Meng

Hosseinkhani

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Polymer nanocomposites-materials in which a polymer matrix is blended with nanoparticles (or fillers)-strengthen under sufficiently large strains. Such strain hardening is critical to their function, especially for materials that bear large cyclic loads such as car tires or bearing sealants. Although the reinforcement (i.e., the increase in the linear elasticity) by the addition of filler particles is phenomenologically understood, considerably less is known about strain hardening (the nonlinear elasticity). Here, we elucidate the molecular origin of strain hardening using uniaxial tensile loading, microspectroscopy of polymer chain alignment, and theory. The strain-hardening behavior and chain alignment are found to depend on the volume fraction, but not on the size of nanofillers. This contrasts with reinforcement, which depends on both volume fraction and size of nanofillers, potentially allowing linear and nonlinear elasticity of nanocomposites to be tuned independently.nanocomposites | nonlinear elasticity | strain stiffening | polymer bridging | polymer chain alignment M any synthetic and natural materials around us increase their elastic modulus upon large deformation after initial softening-a phenomenon that is known as work or strain hardening, which is critical to their function. In ductile polymer materials, the strain-hardening behavior is essential for their functional lifetime, resilience, and toughness-all key parameters of their practical uses-because these materials repetitively bear large loads (1, 2). Many industrial and consumer polymeric materials are composites, in which (hard) nanoscale inorganic particles, or fillers, are blended with polymer matrices to tailor their mechanical properties. In preparing such nanocomposites, filler−filler and filler−matrix interaction, filler dispersion, and polymer properties all affect the linear (low strain) and nonlinear (high strain) mechanical response in nontrivial ways (3). Although a massive volume of work has attempted to clarify the mechanism of reinforcement (increased linear elasticity) at low strain and of nonlinear strain softening (the Payne and Mullins effects) at medium strain, a comparatively much smaller body of work exists that focuses on the mechanism of strain hardening in polymer composite materials.In analogy to rubber elasticity at large deformations, strain hardening in polymer composites is typically attributed to the increasing resistance to deformation of extended and oriented polymer chains (4-7). However, it has been shown that polymer chain alignment during strain hardening is strongly affected by dispersing fillers within the host polymer matrix (8-10). To account for these observations, one needs to establish the relation between the macroscopically observed strain hardening and the microscopic chain alignment that is affected by the presence of fillers.The connection between chain alignment and strain hardening in glassy polymer composites is purported to occur because the fillers act as "entanglement attractors." In this...

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Mechanical, electrical and electro-mechanical properties of thermoplastic elastomer styrene–butadiene–styrene/multiwall carbon nanotubes composites

Cited by 67 publications

References 37 publications

Electro-mechanical properties of triblock copolymer styrene–butadiene–styrene/carbon nanotube composites for large deformation sensor applications

Electro-mechanical properties of triblock copolymer styrene–butadiene–styrene/carbon nanotube composites for large deformation sensor applications

Mechanical behavior of strain sensors based on PEDOT:PSS and silver nanoparticles inks deposited on polymer substrate by inkjet printing

Nanoparticle amount, and not size, determines chain alignment and nonlinear hardening in polymer nanocomposites

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