Temperature dependence of electrical resistivity in carbon nanofiber/unsaturated polyester nanocomposites

Natsuki, Toshiaki; Ni, Qing‐Qing; Wu, Shihong

doi:10.1002/pen.21108

Cited by 31 publications

(12 citation statements)

References 19 publications

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“…Very limited information is instead available on the effect of carbon-based nanofillers on the cure reaction of UP resins, although the employment of this kind of fillers in an UP matrix has great potential on modifying the electrical, thermal and mechanical behaviour of the unfilled systems [20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: Thermal and chemorheological modelling

Monti

Puglia

Natali

et al. 2011

Composites Science and Technology

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Please cite this article as: Monti, M., Puglia, D., Natali, M., Torre, L., Kenny, J.M., Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: thermal and chemorheological modelling, Composites Science and Technology (2011), doi: 10.1016/j.compscitech.2011 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractWe report the study of the effects of carbon nanofibers (CNFs) on the cure kinetics and on the chemorheology of unsaturated polyester resins (UP). Two main experimental techniques were utilized: differential scanning calorimetry and rheometry. Isothermal and dynamic tests were performed on the neat polyester resin and on two nanocomposite systems, with 0.5 and 1.0 wt% of CNFs. Furthermore, a TGA study of the selected systems at different isothermal temperatures was performed to evaluate the styrene consumption and related loss rate during the curing process. Subsequently, a phenomenological model (autocatalytic approach) was applied to the experimental data, both in isothermal and dynamic conditions. In the case of dynamic curing, the evidence of multiple peaks in the heat flow curves was studied through the deconvolution of the overall reaction thermogram in single reaction steps. An empirical rheological model coupled with the reaction kinetics was successfully applied to simulate the viscosity changes of the UP matrix. Experimental and modelling results demonstrate the presence of a delay effect of the CNFs on the cure of the UP resin matrix.

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Section: Introductionmentioning

confidence: 99%

Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: Thermal and chemorheological modelling

Monti

Puglia

Natali

et al. 2011

Composites Science and Technology

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“…In the glassy region, storage modulus follows nearly the same trend as the flexural modulus. But at elevated temperature, due to a higher difference in coefficient of thermal expansion (CTE) of epoxy (64–68 × 10 −6 °C −1 ) and CNF (4 × 10 −6 °C −1 ), the interfacial polymer exerts tensile stress on the CNF, which facilitates the process of debonding under external load. Thus, the CNF‐GE composite showed lower storage modulus compared to GE composite at elevated temperature.…”

Section: Resultsmentioning

confidence: 99%

Effects of acid, alkaline, and seawater aging on the mechanical and thermomechanical properties of glass fiber/epoxy composites filled with carbon nanofibers

Kattaguri

Fulmali

Prusty

et al. 2019

J of Applied Polymer Sci

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Owing to the superior corrosion resistance, fiber-reinforced polymer (FRP) composites are the prime choice of structural materials for various marine and chemical industries, where there is a long-term direct contact of the components takes place with corrosive fluids. In this present work, glass fiber/epoxy (GE) composites have been fabricated with and without carbon nanofibers (CNFs), and aging has been carried out in acidic (pH = 1), seawater (pH = 8.2), and alkaline (pH = 13) solutions for 150 days. The resistance of CNF-filled GE composites toward the corrosive fluids has been evaluated in terms of alteration in the mechanical (flexural), microstructural (fractography analysis by field emission scanning electron microscope), and thermomechanical (dynamic mechanical analysis) behavior of the materials. It is revealed that as the immersion time increases, there is a continuous decrement in flexural strength and modulus, and glass-transition temperature (T g ) of all the materials in all these solutions. Compared to the 1% CNF-filled GE composite, control GE composite showed more degradation in the case of alkaline aging and seawater aging. Maximum reduction (56%) in the strength of GE composite was observed due to 150 days of alkaline aging. However, the control GE composite showed better resistance to the acidic solution than that of CNF-filled GE composite. Possible failure modes, changes in the chemistry of the material due to aging have been studied by fractography analysis.

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“…[24][25][26] The bulk CTE, the bulk modulus, and the shear modulus were obtained from the assumption of an isotropic material 27 for the nano-fillers. The materials properties of the CNF and the epoxy matrix are summarized in Table II.…”

Section: Resultsmentioning

confidence: 99%

Effect of Filler Geometry on Coefficient of Thermal Expansion in Carbon Nanofiber Reinforced Epoxy Composites

Cho¹,

Jang²,

Suhr³

2011

j nanosci nanotechnol

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This study involves the investigation of the geometry effect of nano-fillers on thermally induced dimensional stability of epoxy composites by experimentally evaluating the linear coefficient of thermal expansion (CTE). Carbon nanofibers (CNF) were chosen as the filler in epoxy matrix to investigate the effect of an aspect ratio on the CTE of the nanocomposites at three different volume fractions of 0.5, 1, and 2% of the nano-filler. The composites were fabricated using a mechanical mixing method. The CTE values were evaluated by measuring thermal strains of the composites and also compared with a micromechanics model. It was observed that the composites with short CNF (average L/d = 10) show better thermal stability than one of the composites with long CNF (average L/d = 70), and the thermal stability of the composites was proportional to the volume fraction of the filler in each composite. In addition, the CTE of mutliwalled carbon nanotubes (MWNT) reinforced epoxy composites was evaluated and compared with the CTE of the CNF reinforced composites. Interestingly, the MWNT reinforced composites show the greatest thermal stability with an 11.5% reduction in the CTE over the pure epoxy. The experimental data was compared with micromechanics model.

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Temperature dependence of electrical resistivity in carbon nanofiber/unsaturated polyester nanocomposites

Cited by 31 publications

References 19 publications

Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: Thermal and chemorheological modelling

Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: Thermal and chemorheological modelling

Effects of acid, alkaline, and seawater aging on the mechanical and thermomechanical properties of glass fiber/epoxy composites filled with carbon nanofibers

Effect of Filler Geometry on Coefficient of Thermal Expansion in Carbon Nanofiber Reinforced Epoxy Composites

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