Experimental investigation of the thermoresistive response of multiwall carbon nanotube/polysulfone composites under heating-cooling cycles

Cen-Puc, Marco; Pool, G.; Oliva-Avilés, A.I.; May‐Pat, A.; Avilés, F.

doi:10.1016/j.compscitech.2017.08.003

Cited by 18 publications

(40 citation statements)

References 35 publications

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“…Several studies dealing with thermoplastic composites reveal that temperature has a noticeable influence on mechanical properties [12][13][14][15][16][17][18]. It has been found that tensile strength and Young's modulus of thermoplastic composites decrease with increasing temperature and drop sharply close to the T g [19,20]. On the other hand, above the T g , the strain increases because of the intensive motion of polymers' molecular chains.…”

Section: Introductionmentioning

confidence: 99%

Effect of Glass Fibers Thermal Treatment on the Mechanical and Thermal Behavior of Polysulfone Based Composites

et al. 2020

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The effect of thermal treatment of glass fibers (GF) on the mechanical and thermo-mechanical properties of polysulfone (PSU) based composites reinforced with GF was investigated. Flexural and shear tests were used to study the composites’ mechanical properties. A dynamic mechanical analysis (DMA) and a heat deflection temperature (HDT) test were used to study the thermo-mechanical properties of composites. The chemical structure of the composites was studied using IR-spectroscopy, and scanning electron microscopy (SEM) was used to illustrate the microstructure of the fracture surface. Three fiber to polymer ratios of initial and preheated GF composites (50/50, 60/40, 70/30 (wt.%)) were studied. The results showed that the mechanical and thermo-mechanical properties improved with an increase in the fiber to polymer ratio. The interfacial adhesion in the preheated composites enhanced as a result of removing the sizing coating during the thermal treatment of GF, which improved the properties of the preheated composites compared with the composites reinforced with initial untreated fibers. The SEM images showed a good distribution of the polymer on the GF surface in the preheated GF composites.

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Section: Introductionmentioning

confidence: 99%

Effect of Glass Fibers Thermal Treatment on the Mechanical and Thermal Behavior of Polysulfone Based Composites

et al. 2020

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“…Each specimen was subjected to heating above room temperature (RT~25 • C), which was ramped up at 0.8 • C/min until 80 • C (40 min), and cooling back to RT at 0.2 • C/min (4 h) for four continuous cycles. The first cycle was not considered for data acquisition in order to disregard the effect of moisture and residual thermal history on the electrical response of the CNTY monofilament composites [34]. The heating temperature coefficient of resistance (β H ) was calculated at heating zones for both specimens according to Equation (1).…”

Section: Cyclic Thermoresistive Response Of Cnty/epoxy Monofilament Compositesmentioning

confidence: 99%

Effect of Curing Temperature of Epoxy Matrix on the Electrical Response of Carbon Nanotube Yarn Monofilament Composites

2022

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In order to evaluate the capability of carbon nanotube yarn (CNTY)-based composites for self-sensing of temperature, the temperature-dependent electrical resistance of CNTY monofilament composites was investigated using two epoxy resins: one that cures at 130 °C (CNTY/ERHT) and one that cures at room temperature (CNTY/ERRT). The effect of the curing kinetics of these epoxy resins on the electrical response of the embedded CNTY was investigated in prior studies. It was observed that the viscosity and curing kinetics affect the level of wetting and resin infiltration, which govern the electrical response of the embedded CNTY. In this work, the cyclic thermoresistive characterization of CNTY monofilament composites was conducted under heating–cooling, incremental heating–cooling, and incremental dwell cycles in order to study the effect of the curing temperature of the epoxy matrix on the electrical response of the CNTY monofilament composites. Both monofilament composites showed nearly linear and negative temperature coefficients of resistance (TCR) of −7.07 × 10−4 °C−1 for specimens cured at a high temperature and −5.93 × 10−4 °C−1 for specimens cured at room temperature. The hysteresis loops upon heating–cooling cycles were slightly smaller for high-temperature cured specimens in comparison to those cured at room temperature. A combination of factors, such as resin infiltration, curing mechanisms, intrinsic thermoresistivity of CNTY, variations in tunneling and contact resistance between the nanotubes and CNT bundles, and the polymer structure, are paramount factors in the thermoresistive sensitivity of the CNTY monofilament composites.

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“…The gradual decrease in ∆R/R0 in dwell zones could be related to the thermo-viscoelastic behavior of the silicone matrix and dielectric relaxation effects in the CNTY [28]. This shows that the electrical signal of the embedded CNTY could be sensitive to the polymer stress relaxation [12,29]. The average SNR values were calculated at every dwell zone according to Equation (1).…”

Section: Electrical Response Of Cnty During Heating-dwell Thermoresistive Characterizationmentioning

confidence: 99%

“…The electrical resistance and temperature of the specimens were simultaneously measured throughout the heating and cooling sections of the experiment and the graphs were obtained for the last three cycles. The first cycle was not considered in order to disregard any thermal history of the material, which may cause the first cycle to behave differently than the subsequent ones [12,14]. Figure 7 shows the fractional change in electrical resistance as a function of temperature change of the CNTY/silicone monofilament composites.…”

Section: Electrical Response Of Cnty During Cyclic Thermoresistive Characterizationmentioning

confidence: 99%

“…In addition, the high porosity of the CNTYs may promote infiltration of liquids between the CNT bundles affecting the stiffness, toughness, and electrical conductivity of the yarn by separating the adjacent CNT bundles and increasing the contact electrical resistance [3,[7][8][9]. It was observed that C 2021, 7, 60 2 of 14 the thermoresistive properties of the embedded CNTY strongly depend on the chemical structure of the polymeric matrix, temperature range, porosity, and capillary diffusion of polar liquids [3,8,[10][11][12][13][14][15]. Rodríguez-Uicab et al [10] investigated the effect of the curing kinetics of epoxy resins with different viscosities on the thermoresistive response of the CNTY monofilament composites at different curing temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Monitoring of Curing and Cyclic Thermoresistive Response Using Monofilament Carbon Nanotube Yarn Silicone Composites

Tayyarian

Rodríguez-Uicab

Abot

2021

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The curing process and thermoresistive response of a single carbon nanotube yarn (CNTY) embedded in a room temperature vulcanizing (RTV) silicone forming a CNTY monofilament composite were investigated toward potential applications in integrated curing monitoring and temperature sensing. Two RTV silicones of different crosslinking mechanisms, SR1 and SR2 (tin- and platinum-cured, respectively), were used to investigate their curing kinetics using the electrical response of the CNTY. It is shown that the relative electrical resistance change of CNTY/SR1 and CNTY/SR2 monofilament composites increased by 3.8% and 3.3%, respectively, after completion of the curing process. The thermoresistive characterization of the CNTY monofilament composites was conducted during heating–cooling ramps ranging from room temperature (RT~25 °C) to 100 °C. The thermoresistive response was nearly linear with a negative temperature coefficient of resistance (TCR) at heating and cooling sections for both CNTY/SR1 and CNTY/SR2 monofilament composites. The average TCR value was −8.36 × 10−4 °C−1 for CNTY/SR1 and −7.26 × 10−4 °C−1 for CNTY/SR2. Both monofilament composites showed a negligible negative residual relative electrical resistance change with average values of ~−0.11% for CNTY/SR1 and ~−0.16% for CNTY/SR2 after each cycle. The hysteresis amounted to ~21.85% in CNTY/SR1 and ~29.80% in CNTY/SR2 after each cycle. In addition, the effect of heating rate on the thermoresistive sensitivity of CNTY monofilament composites was investigated and it was shown that it reduces as the heating rate increases.

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Experimental investigation of the thermoresistive response of multiwall carbon nanotube/polysulfone composites under heating-cooling cycles

Cited by 18 publications

References 35 publications

Effect of Glass Fibers Thermal Treatment on the Mechanical and Thermal Behavior of Polysulfone Based Composites

Effect of Glass Fibers Thermal Treatment on the Mechanical and Thermal Behavior of Polysulfone Based Composites

Effect of Curing Temperature of Epoxy Matrix on the Electrical Response of Carbon Nanotube Yarn Monofilament Composites

Monitoring of Curing and Cyclic Thermoresistive Response Using Monofilament Carbon Nanotube Yarn Silicone Composites

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