The synergistic effect on the thermomechanical and electrical properties of carbonaceous hybrid polymer nanocomposites

Charitos, Ilias; Georgousis, G.; Klonos, Panagiotis Α.; Kyritsis, Apostolos; Mouzakis, Dionysios E.; Raptis, Yiannis S.; Kontos, Athanassios G.; Kontou, E.

doi:10.1016/j.polymertesting.2021.107102

Cited by 17 publications

(38 citation statements)

References 44 publications

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“…Additionally CNFs are well dispersed. 30 In Figure 3(d), of the mLLDPE/ GO/CNT/1.31%, GO platelets of about a thickness of 150 nm are detected, whereas CNTs are randomly distributed in the matrix volume. Figure 3(e) (mLLDPE/GO/ CNT/3.84%) and Figure 3(f ) (mLLDPE/ GO/CNT/6.25%) demonstrate good CNTs dispersion and GO flakes exfoliation, supporting this way the improved mechanical enhancement.…”

Section: Resultsmentioning

confidence: 93%

“…The tensile experimental results of the nanocomposites under investigation are extensively presented in our previous work. 30 The elastic properties of the materials are given in Table 1.Tensile creep experiments were performed at various stress levels (not presented here).The onset of non-linearity was found by the construction of the isochrones for all nanocomposites examined (Figure 1). The creep isochrones were plotted for a time of 2 and 10 min.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 3(e) (mLLDPE/GO/ CNT/3.84%) and Figure 3(f ) (mLLDPE/ GO/CNT/6.25%) demonstrate good CNTs dispersion and GO flakes exfoliation, supporting this way the improved mechanical enhancement. 30 4 | MODELING…”

Section: Resultsmentioning

confidence: 99%

“…The polymeric material employed as a matrix is a linear low-density polyethylene (LLDPE), which is based on octane comonomer, and prepared by metallocene catalyst and is designated as mLLDPE. 30 It was kindly supplied by Flexopack SA, Athens, Greece. The density is 0.90 g/cm 3 , the melt flow index (MFI) was measured at 190 C at a load of 2.16 kg to be 1 according to ASTM-D1238-65T.…”

Section: Methodsmentioning

confidence: 99%

“…The processing conditions of the mLLDPE/nanocomposites under investigation are presented in detail in Ref. 30.Creep experiments were performed with TA Q800, at a single cantilever beam mode of deformation, for a specific time period equal to 20 min, and hereafter recovery for 40 min, at 30 C at various stresses below the yield stress of the materials.…”

Section: Methodsmentioning

confidence: 99%

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Creep resistance of linear low density polyethylene/carbonaceous hybrid nanocomposites: Experiments and modeling

Charitos

Kontou

2021

J of Applied Polymer Sci

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In the present work, the creep response of nanocomposites based on metallocene linear low density polyethylene (mLLDPE), reinforced with three types of carbonaceous nanofillers, namely carbon nanotubes (CNTs), graphene oxide (GO) platelets, and carbon nanofibers (CNFs) was experimentally studied. The effect of the nanofiller loading and the hybrid character of nanocomposites on the creep resistance of the nanocompsites was analyzed. In all cases, the creep resistance of the nanocomposites examined has been postulated. To support these results, creep has been modeled by a power creep law, while the creeprecovery modeling was achieved by a viscoelastic model. The implementation of the viscoelastic model has been made by assuming that the nanocomposite's structure can be represented by a physical network, with the dispersed nanofillers participating in the molecular rearrangements, which take place upon the imposition of stress. The time dependent constitutive equation involves a relaxation function, based on a Gaussian type distribution function, associated with the energy barriers that molecular segments need to overcome, for transitions to occur. It was found that creep-recovery strain could be accurately captured with the same set of parameters, whereas the number of required model parameters was quite lower than that in the widely known viscoelastic models.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Creep resistance of linear low density polyethylene/carbonaceous hybrid nanocomposites: Experiments and modeling

Charitos

Kontou

2021

J of Applied Polymer Sci

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Thermomechanical performance of biodegradable poly (lactic acid)/carbonaceous hybrid nanocomposites: Comparative study

et al. 2022

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In the present research, a series of hybrid nanocomposites based on polylactic acid (PLA) matrix and mixtures of graphene oxide (GO) with carbon nanotubes (CNTs) or carbon nanofibers (CNFs), at various loadings, were prepared and experimentally studied. Several experimental techniques were employed to analyze the morphology and the thermomechanical performance of the materials, as well as the dielectric properties. The related experimental data support the conclusion that a synergistic effect is exhibited by the PLA/GO/CNT nanocomposites. This effect was verified by the higher mechanical enhancement, the higher crystallinity and the development of conductive paths into the bulk matrix.

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Study of the dynamic fragility of polymer nanocomposites: Correlation with damping

Charitos

Kontou

2023

Polymer Composites

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In this work, an extensive study on the glass transition temperature (Tg), dynamic fragility and activation energy (Ea) for a variety polymeric nanocomposite materials, based on four different types of polymeric matrices reinforced with carbonaceous nanofillers, and SiO2 has been performed. Referring to the dynamic mechanical analysis data obtained in the author's previous works, the dynamic fragility and activation energy were calculated and examined. Depending on the polymeric type, different behavior was detected, as far as the fragility dependence on nanofiller type and loading is concerned, whereas the Tg variation was also investigated. A general trend of a decreasing dynamic fragility with increasing Tg was found, with the exception of Polylactic acid (PLA)/hybrid nanocomposites. A relation between nanofillers synergy and dynamic fragility variation has been achieved, namely the more homogenous nanofillers dispersion (and the synergistic effect between nanofillers), was associated with higher dynamic fragility values. Furthermore, the inter‐particle distance increment may lead to an increased fragility and the Resin/SiO2 nanocomposites appear to follow this rule. In addition, strain sweep experiments were conducted to analyze the connection between fragility and damping of the polymer nanocomposites. The PLA/hybrid carbonaceous nanocomposites reveal an essential damping enhancement, associated with fragility lowering.

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The synergistic effect on the thermomechanical and electrical properties of carbonaceous hybrid polymer nanocomposites

Cited by 17 publications

References 44 publications

Creep resistance of linear low density polyethylene/carbonaceous hybrid nanocomposites: Experiments and modeling

Creep resistance of linear low density polyethylene/carbonaceous hybrid nanocomposites: Experiments and modeling

Thermomechanical performance of biodegradable poly (lactic acid)/carbonaceous hybrid nanocomposites: Comparative study

Study of the dynamic fragility of polymer nanocomposites: Correlation with damping

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