Strain-dependent electrical resistance of epoxy/MWCNT composite after hydrothermal aging

Starkova, Olesja; Mannov, E.; Schulte, Karl; Aniskevich, Andrey

doi:10.1016/j.compscitech.2015.06.004

Cited by 32 publications

(18 citation statements)

References 29 publications

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“…Almost the same effect related to moisture uptake was observed on the tensile elastic properties of the epoxy and epoxy/MWCNTs (0.3–1 wt %) composites for samples conditioned up to saturation [8]. These effects induce a decrease of elastic modulus (~5%–8%) and strength (~18%–22%) compared to the initial state.…”

Section: Introductionmentioning

confidence: 63%

“…However, to date, such materials have been limited mostly to indoor applications due to the relative sensitivity of the mechanical properties of polymers and polymer composites to environmental conditions, such as moisture and temperature [3]. The analysis of the available literature revealed contradictory information on the reversibility of hygrothermal effects on the structure and mechanical properties of epoxy [3,4,5] and epoxy-based nanocomposite (NC) [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Moisture Sorption and its Effects on the Thermomechanical Properties of Epoxy and Epoxy/MWCNT Nanocomposite

et al. 2019

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The aim of this work was to reveal the moisture absorption–desorption–resorption characteristics of epoxy and epoxy-based nanocomposites filled with different multiwall carbon nanotubes (MWCNTs) by investigating the reversibility of the moisture effect on their thermomechanical properties. Two types of MWCNTs with average diameters of 9.5 and 140 nm were used. For the neat epoxy and nanocomposite samples, the moisture absorption and resorption tests were performed in atmospheres with 47%, 73%, and 91% relative humidity at room temperature. Dynamic mechanical analysis was employed to evaluate the hygrothermal ageing effect for unconditioned and environmentally “aged” samples. It was found that moisture sorption was not fully reversible, and the extent of the irreversibility on thermomechanical properties was different for the epoxy and the nanocomposite. The addition of both types of MWCNTs to the epoxy resin reduced sorption characteristics for all sorption tests, improved the hygrothermal and reduced the swelling rate after the moisture absorption–desorption.

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Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Cyclic Moisture Sorption and its Effects on the Thermomechanical Properties of Epoxy and Epoxy/MWCNT Nanocomposite

et al. 2019

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“…In this sense, study of cure behavior/kinetics provides useful insights about structural evolutions . Although reinforcement of epoxy with carbon‐based fillers (CBF) has been the subject of diverse reports , a little has been learned about the explicit correlation between cure kinetics and mechanical properties of CBF/epoxy nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Design, preparation, and characterization of fast cure epoxy/amine‐functionalized graphene oxide nanocomposites

et al. 2017

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Fast cure epoxy/amine‐functionalized graphene oxide (GO) nanocomposites were designed, prepared, and characterized in this work. The GO nanosheets were functionalized by aliphatic amines having the same structure but different chain length. XPS and FTIR analyses were used to probe chemical structure and elemental surface composition of nanosheets before and after functionalization. Cure kinetics analysis was performed by dynamic differential scanning calorimetry (DSC) on samples containing pristine and functionalized GO to achieve minimum possible hindered cure. Kinetic studies confirmed that addition of pristine GO brings a steric hindrance effect, as signaled by a fall in the onset temperature, exotherm temperature and the total heat of curing reaction. According to isoconversional model, activation energy of cure reaction fell from approximately 80 to slightly over 60 kJ mol−1 as a result of improved dispersion. SEM micrographs provided evidence for good dispersion of GO platelets bearing short‐arm amines; but activation energy in such system was surprisingly higher than that of the one filled with pristine GO. By contrast, network formation in nanocomposites with GO functionalized by long‐arm amine has been facilitated, signifying the dominance of aliphatic amine length over dispersion state. The accelerated/decelerated cure is inferred based on the reactivity of reaction moieties, dispersion state of GO in the epoxy matrix, and cure behavior/kinetics of nanocomposites. The developed fast cure epoxy/GO nanocomposites compete in crosslinking with blank epoxy system. POLYM. COMPOS., 39:E2016–E2027, 2018. © 2017 Society of Plastics Engineers

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“…The ever‐increasing progress of epoxy/carbon nanotubes (CNTs) composites takes its origin in superior properties of epoxy (high modulus, chemical resistance, and thermal stability) and those of CNTs (excellent electrical, thermal, and mechanical properties). Nevertheless, excessive surface energy of CNTs as well as insufficient interfacial adhesion between the thermosetting materials and nanotubes makes dispersion of CNTs within the polymers difficult.…”

Section: Introductionmentioning

confidence: 99%

Cure kinetics of epoxy/MWCNTs nanocomposites: Nonisothermal calorimetric and rheokinetic techniques

Saeb

Rastin

Nonahal

et al. 2017

J of Applied Polymer Sci

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Nonisothermal calorimetric and isothermal rheokinetic analyses were used to study cure kinetics of epoxy/anhydride systems containing very low concentration of pristine and amine-functionalized multiwalled carbon nanotubes (MWCNTs). Isoconversional methods were applied in calorimetric modeling of cure kinetics. E a versus a dependency and autocatalytic nature of curing were identified for both types of nanocomposites by isoconversional models. Fall in E a value from 90 to 82.5 kJ mol 21 thanks to amine functionalization (with E a of blank epoxy/anhydride of 80.3 kJ mol 21 ) was indicative of high potential of nanocomposites to cure at low concentration of functionalized MWCNTs (0.1 g with respect to 100 g of resin). Times of gelation and vitrification of epoxy were measured using storage and loss modulus data provided by isothermal rheokinetic analysis, showing a drop upon attachment of amine groups to MWCNTs. In complete agreement with nonisothermal calorimetric studies, variation of storage and loss modulus of nanocomposites confirmed hindered/accelerated cure devoted to pristine/amine-functionalized MWCNTs.

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Strain-dependent electrical resistance of epoxy/MWCNT composite after hydrothermal aging

Cited by 32 publications

References 29 publications

Cyclic Moisture Sorption and its Effects on the Thermomechanical Properties of Epoxy and Epoxy/MWCNT Nanocomposite

Cyclic Moisture Sorption and its Effects on the Thermomechanical Properties of Epoxy and Epoxy/MWCNT Nanocomposite

Design, preparation, and characterization of fast cure epoxy/amine‐functionalized graphene oxide nanocomposites

Cure kinetics of epoxy/MWCNTs nanocomposites: Nonisothermal calorimetric and rheokinetic techniques

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