Creep of high density polyethylene filled with multiwall carbon nanotubes

Starkova, Olesja; Sevcenko, Jevgenijs; Stankevich, Stanislav; Bulderberga, Olga; Aniskevich, Andrey

doi:10.1088/1742-6596/1431/1/012005

Cited by 7 publications

(17 citation statements)

References 22 publications

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“…Similar total strain versus residual strain dependence was obtained in the authors' earlier study for various HDPE/ MWCNT composites produced and tested by similar routes. 9,10 Some similarities in discussions on smoothing of data scatter are found in a study of Pupure et al for natural fiber composites. 39 Authors introduced a damage function in the form of strain-dependent (instead of common stress-dependent) stiffness degradation, although mentioning coupled effects of damage and viscoplasticity.…”

Section: Relationship Between the Residual And Total Creep Strainmentioning

confidence: 58%

“…Choice of the mixing method via calendaring instead of a traditional extrusion is explained by its simplicity and lower amount of required raw materials, since no essential differences in morphology and thermal and mechanical properties were noticed for similar HDPE/MWCNT samples produced by both routes. 9,10 Totally, samples with seven various contents of MWCNT were produced: 0, 2, 5, 8, 10, 15 and 20 wt% MWCNT. Samples with the maximal 20 wt% MWCNT (pure masterbatch) were produced by compression molding only.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…2,7,8 A positive effect of MWCNT on creep resistance of high-density polyethylene (HDPE) produced via the masterbatch dilution is highlighted in the authors' recent study. 9,10 Time-dependent response of polymers is governed by reversible viscoelastic and irreversible viscoplastic and damage effects. The reinforcing effect of nanoparticles, MWCNT in particular, appears in an increased creep resistance of nanocomposites compared to neat polymers.…”

Section: Introductionmentioning

confidence: 99%

“…The reinforcing effect of nanoparticles, MWCNT in particular, appears in an increased creep resistance of nanocomposites compared to neat polymers. 2,[7][8][9][11][12][13] MWCNT hamper movements of polymer macromolecules, and thus retard relaxation processes in a polymer and diminish its viscoelastic response. In semicrystalline polymers, nanoparticles affect also their crystallinity and morphology (size and distribution of crystallites)-factors greatly contributing to viscoplastic response of polymers.…”

Section: Introductionmentioning

confidence: 99%

“…Most of these studies are devoted to characterization of elastic, strength, electrical, and rheological properties of masterbatch‐produced nanocomposites, while their time‐dependent and long‐term deformation properties, for example, creep behavior, are rarely reported 2,7,8 . A positive effect of MWCNT on creep resistance of high‐density polyethylene (HDPE) produced via the masterbatch dilution is highlighted in the authors' recent study 9,10 …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Relationship between the residual and total strain from creep‐recovery tests of polypropylene/multiwall carbon nanotube composites

Starkova

Анискевич

Sevcenko

et al. 2020

J of Applied Polymer Sci

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An assessment of accumulated irreversible strains in polymer composites is a crucial element for controlling dimensional stability of structural components and their remnant life. The residual strains as functions of total creep strains are analyzed by example of creep-recovery data of polypropylene (PP)/multiwall carbon nanotube (MWCNT) composites. To cover wide range of strains, creep test regimes with different stresses, loading time, and number of cycles were applied. Totally, data of 62 single creep-recovery tests for 7 material compositions were used for analysis. A general empirical relationship between the residual and total creep strain is established and finely described by a power law. The residual strain increases with increasing stress and time of loading and decreases with growing amount of MWCNT. The total creep strain, which is implicitly related to stress, time, and sample specificity, determines the contribution of irreversible deformation. This fact overcomes data variability within one series of samples. Similar empirical relationships are obtained for 25 polymer composites from literature reinforced with different types and amount of fillers and tested under different temperatures. The empirical relationship can be used for an express assessment of residual strains accumulated in a long term by performing just a few short-term control tests.

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Section: Relationship Between the Residual And Total Creep Strainmentioning

confidence: 58%

Section: Materials and Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Relationship between the residual and total strain from creep‐recovery tests of polypropylene/multiwall carbon nanotube composites

Starkova

Анискевич

Sevcenko

et al. 2020

J of Applied Polymer Sci

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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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Model Simulation of Creep and Thermal Ratcheting of Engineering Polymers

Spathis

Kontou

2021

Macro Theory & Simulations

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In the present work, the creep response at specific temperatures and stress level of several polymers has been modeled by a viscoelastic model, analyzed in previous works. In particular, the experimental creep results under thermal cycling of polymers used in bolted flange connections, utilized as components of pressure vessel and piping are employed. The analysis is focused on the experimental results for polymeric flange materials like high density polyethylene and three types of gasket materials, namely poly-tetrafluoroethylene PTFE (expanded e-and virgin v-) and clickable nucleic acid. It has been proved that by the implementation of the model on a simple creep curve at a specific temperature, the model parameters could be evaluated. Hereafter, by imposing a thermal cycling process, two more parameters, associated with thermal ratcheting, could be acquired. It is found that the thermal ratcheting behavior exhibited by the employed materials, could be captured with a good accuracy. Given that the effect of thermal ratcheting on the long-time performance of polymers in targeted applications is a crucial issue, the research findings in the present work are encouraging for the design of appropriate materials, and the prediction of thermal ratcheting.

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Creep of high density polyethylene filled with multiwall carbon nanotubes

Cited by 7 publications

References 22 publications

Relationship between the residual and total strain from creep‐recovery tests of polypropylene/multiwall carbon nanotube composites

Relationship between the residual and total strain from creep‐recovery tests of polypropylene/multiwall carbon nanotube composites

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

Model Simulation of Creep and Thermal Ratcheting of Engineering Polymers

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