Interphasial viscoelastic behavior of CNT reinforced nanocomposites studied by means of the concept of the hybrid viscoelastic interphase

Papanicolaou, George; Xepapadaki, A. G.; Drakopoulos, E. D.; Papaefthymiou, K. P.; Portan, D. V.

doi:10.1002/app.35202

Cited by 19 publications

(9 citation statements)

References 29 publications

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“…So, the addition of MWCNTs improves creep resistance of epoxy matrix affected by two factors, i.e., stress and temperature. Papanicolaou et al33 reported similar results for creep of MWCNT/epoxy NC at lower stress level. Such improvement in creep resistance was attributed to the increased tendency of epoxy to exhibit its elastic rather than its viscous nature with the addition of MWCNTs.…”

Section: Resultsmentioning

confidence: 62%

Modeling of creep for multiwall carbon nanotube/epoxy nanocomposite

Glaskova

Анискевич

Borisova

2013

J of Applied Polymer Sci

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The effect of multiwall carbon nanotubes (MWCNTs) on creep of epoxy matrix was evaluated on the basis of short-term creep-recovery tests performed at different stresses and temperatures. Six different compositions of MWCNT and bisphenol A epoxy resin (0-3.8 wt % of MWCNTs) were investigated. Slight reduction of creep compliance, strain rate, and residual strain were revealed experimentally for nanocomposite comparing to the neat resin. The development of viscoelastic strain for creep stage was described by the use of time-temperature-strain superposition principle with the parameters obtained from the approximation of recovery stage using modified Schapery model. The model accounted for the effect of strain on the viscoelastic strain rate for recovery stage. Its application gave better results for approximation of a series of recovery curves at different temperatures and stresses than of timestress superposition model.

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Section: Resultsmentioning

confidence: 62%

Modeling of creep for multiwall carbon nanotube/epoxy nanocomposite

Glaskova

Анискевич

Borisova

2013

J of Applied Polymer Sci

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“…Combining time and the effect of the degree of adhesion between phases, which is expressed as the abrupt jump in properties at the inclusion–interphase boundary, the situation becomes much more complex. Given that interfacial phenomena and the interphase region, in general, are critical for the composite’s global response, the viscoelastic behavior of the interphase was modeled by introducing the concept of hybrid viscoelastic interphase [ 30 ].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…As shown in [ 30 ], one of the main factors affecting the interphase thickness is the degree of the adhesion coefficient k E . This is defined as:

…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The present investigation is a novelty since it is an effort to find the interrelation existing between all the above-mentioned parameters. More precisely, the aim of the present study is to investigate the stress relaxation behavior of a glass fiber-reinforced polymer (GFRP) and predict its fiber–matrix interphase modulus, thickness and time dependence using the hybrid viscoelastic interphase model (HVIM), which is a semiempirical model developed by Papanicolaou [ 30 ]. In this model, values of the relaxation modulus are correlated to the interphase thickness, and the fiber volume fraction and fiber–matrix adhesion quality are interplayed to alter the overall behavior of the composite and predict its limits when in service.…”

Section: Introductionmentioning

confidence: 99%

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Interrelation between Fiber–Matrix Interphasial Phenomena and Flexural Stress Relaxation Behavior of a Glass Fiber–Polymer Composite

2021

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The response of fiber-reinforced polymer composites to an externally applied mechanical excitation is closely related to the microscopic stress transfer mechanisms taking place in the fiber–matrix interphasial region. In particular, in the case of viscoelastic responses, these mechanisms are time dependent. Defining the interphase thickness as the maximum radial distance from the fiber surface where a specific matrix property is affected by the fiber presence, it is important to study its variation with time. In the present investigation, the stress relaxation behavior of a glass fiber-reinforced polymer (GFRP) under flexural conditions was studied. Next, applying the hybrid viscoelastic interphase model (HVIM), developed by the first author, the interphase modulus and interphase thickness were both evaluated, and their variation with time during the stress relaxation test was plotted. It was found that the interphase modulus decreases with the radial distance, being always higher than the bulk matrix modulus. In addition, the interphase thickness increases with time, showing that during stress relaxation, fiber–matrix debonding takes place. Finally, the effect of fiber interaction on the interphase modulus was found. It is observed that fiber interaction depends on both the fiber–matrix degree of adhesion as well as the fiber volume fraction and the time-dependent interphase modulus.

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“…In Kontou and Niaounakis, 20 this model has been applied to LLDPE/silica nanocomposites and provided the best fitting with the experimental data, in respect to micromechanical models, introduced for microcomposites. Regarding the concept of interphase, it has been analyzed by the term 'hybrid interphase' in Papanicolaou et al 21,22 By this term it is meant, the interphase material surrounding the reinforcement, as well as the interphase thickness, representing the maximum radial distance from the inclusion boundary, in which this property is affected by the inclusion's presence.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the elastic stiffness of biobased polymer nanocomposites

Georgiopoulos

Kontou

2014

Journal of Reinforced Plastics and Composites

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The increment of the elastic modulus of two series of biobased polymer nanocomposites with increasing nanofiller volume fraction was simulated with a micromechanical model developed in previous works. The model assumes an effective interphase between the matrix and the nanoparticles, with different elastic properties. This model has been modified, by assuming that the ratio of particle radius over the interphase thickness follows a normal distribution. Simulating the experimental data of tensile modulus, an average value of the ratio of interphase thickness over particle radius was estimated, for all nanocomposites examined. The simulations were in accordance with the nanofillers quality dispersion, as provided by scanning electron microscopy. It was found that the interphase thickness (over particle radius) increment is correlated with the enhanced compatibility of polymeric matrix with silica nanofillers. Furthermore, a finite element analysis has been performed, and its results were compared to the analytical calculations.

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Interphasial viscoelastic behavior of CNT reinforced nanocomposites studied by means of the concept of the hybrid viscoelastic interphase

Cited by 19 publications

References 29 publications

Modeling of creep for multiwall carbon nanotube/epoxy nanocomposite

Modeling of creep for multiwall carbon nanotube/epoxy nanocomposite

Interrelation between Fiber–Matrix Interphasial Phenomena and Flexural Stress Relaxation Behavior of a Glass Fiber–Polymer Composite

Modeling of the elastic stiffness of biobased polymer nanocomposites

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