Creep behavior of HDPE/PA66 microfibrillar composites modified with graphite nanoplatelets

Kelnar, Ivan; Bal, Ümitcan; Ujčič, Alexandra; Kaprálková, Ludmila; Krejčíková, Sabina; Steinhart, Michal; Nofar, Mohammadreza

doi:10.1007/s10965-020-02093-6

Cited by 6 publications

(7 citation statements)

References 35 publications

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“…A dispersed polymer component that exhibits creep, yield, and irreversible deformation is very different from a conventional mineral filler or reinforcement used in typical composites. Therefore, the study of the behavior of MFCs containing polymer fibrils is of particular importance 62–64 . In order to determine the contribution of fibrillar structure in elasticity and also to evaluate the recovery behavior of Fbr samples prepared under different kinetic conditions, creep‐recovery measurements were performed on these samples.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the study of the behavior of MFCs containing polymer fibrils is of particular importance. [62][63][64] In order to determine the contribution of fibrillar structure in elasticity and also to evaluate the recovery behavior of Fbr samples prepared under different kinetic conditions, creep-recovery measurements were performed on these samples.…”

Section: Creep-recoverymentioning

confidence: 99%

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Investigation the effect of processing condition and dispersed phase content on rheology–morphology relationship in polypropylene/polyethylene terephthalate microfibrillar composite

Hejazi

Masoomi

2022

Polymers for Advanced Techs

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Morphological evolutions during the production of microfibrillar composites can be investigated by considering two main steps: (1) the melt blending in the extruder and (2) the drawing process. Deformation, coalescence and break‐up of dispersed phase droplets under shear and elongational flow fields applied in these two main steps lead to the formation of fibrillar morphology. Therefore, it can be stated that the fibrillar morphology is controlled by dispersed phase content, rheological and interfacial properties of the components as well as dispersed phase domains relaxation. In this study, the effect of dispersed phase content on the morphology of the polypropylene/polyethylene terephthalate microfibrillar composite was investigated. Also, three following processing parameters were considered to evaluate the kinetics of in‐situ formation of the microfibrils: Extruder die temperature, water bath temperature and the drawing path length. Linear and nonlinear rheological tests were used as an efficient tool to investigate the rheology–morphology relationship. Among the processing parameters studied, the drawing path length and die temperature had the most and least effect on microfibrillar morphology, respectively. By increasing the drawing path length from 20 to 30 cm, the break‐up of the fibrils and non‐uniformity in the cross section of the fibrils caused a weaker strain recovery after stress removal and also a rapid reduction of stress after cessation of steady shear flow field. Increasing the die temperature has a similar but weaker effect on the final morphology. The rheological results in the linear viscoelastic range all indicated the formation of a physical network of microfibrils within the matrix.

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Section: Resultsmentioning

confidence: 99%

Section: Creep-recoverymentioning

confidence: 99%

Investigation the effect of processing condition and dispersed phase content on rheology–morphology relationship in polypropylene/polyethylene terephthalate microfibrillar composite

Hejazi

Masoomi

2022

Polymers for Advanced Techs

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“…In this context, nanoparticles could also be incorporated in either phase to control the melt viscoelastic properties of the blends. The control of rheological properties could further control the fibrillation of the droplets during the stretching and the eventual dimensional properties of the generated fibrillar structure 9–15 . Incorporation of compatibilizers could also influence the phase interfacial interactions which control the induced droplet size during the melt mixing.…”

Section: Introductionmentioning

confidence: 99%

“…The control of rheological properties could further control the fibrillation of the droplets during the stretching and the eventual dimensional properties of the generated fibrillar structure. [9][10][11][12][13][14][15] Incorporation of compatibilizers could also influence the phase interfacial interactions which control the induced droplet size during the melt mixing. Therefore, the refined droplet size could further affect the geometrical properties of the formed fibrillar structure during the drawing step.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and viscoelastic properties of polyethylene‐based microfibrillated composites from 100% recycled resources

Nofar

Yenigul

Özdemir

et al. 2021

J of Applied Polymer Sci

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In this study, recycled polyethylene (rPE) based microfibrillated composites (MFCs) were developed while incorporating recycled poly(ethylene terephthalate) (rPET) and recycled polyamide 6 (rPA) as the reinforcing fibrillar phases at a given weight ratio of 80 wt% (rPE)/20 wt% (rPET or rPA). The blends were first melt processed using a twin‐screw extruder. The extrudates were then cold stretched at a drawing ratio of 2.5 to form rPET and rPA fibrillar structures. Next, the pelletized drawn samples were injection molded at the barrel temperatures below the melting temperatures of rPET and rPA. The tensile, three‐point bending, impact strength, dynamic thermomechanical, and rheological properties of the fabricated MFCs were analyzed. The effects of injection molding barrel temperature (i.e., 150°C and 190°C) and extrusion melt processing temperature (i.e., 250°C and 275°C) on the generated fibrillar structure and the resultant properties were explored. A strong correlation between the fibrillar morphology and the mechanical properties with the extrusion and injection molding temperatures was observed. Moreover, the ethylene/n‐butyl acrylate/glycidyl methacrylate (EnBAGMA) terpolymer and maleic anhydride grafted PE (MAH‐g‐PE) were, respectively, melt processed with rPE/rPET and rPE/rPA6 blends as compatibilizers. The compatibilizers refined the fibrillar structure and remarkably influenced mechanical properties, specifically the impact strength.

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“…Creep is the permanent strain in a material subjected to an external factor (stress or temperature, for instance), being a function of the time. 15,16 Kelnar et al 17 use dynamical mechanical analysis (DMA) to measure the creep behavior of microfibrillar composites based on high-density polyethylene. In this work was observed lower creep resistance, compared to the glass fiber reinforced composite, due to the difference in respective elastic modulus value.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of creep behavior in thermoset and thermoplastic composites reinforced with carbon and glass fibers

Monticeli

Reis

Neves

et al. 2020

The Journal of Strain Analysis for Engineering Design

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The thermoplastic and thermoset laminates reinforced with different fibers generate variations in the laminated composite mechanical behavior. This work aims to analyze thermoplastic and thermoset composites creep behavior with a reduced number of experiments, applying curve-fitting analytical models (Weibull and Findley) and statistical approach (ANOVA, F-test, and SRM) in order to describe creep behavior. Creep tests were carried out using a design of experiments to define parameter levels, aiming to reduce the number of the experiments, keeping reliability relevance. The temperature shows a stronger influence of creep deformation compared with the use of distinct materials. Thermoplastic matrices seem to be more sensitive to deformation, decreasing the reinforcement contribution. On the other hand, the creep resistance of the thermoset matrix conducts a significant contribution of strain behavior for the reinforcement used. The Findley model showed a temperature-dependent response. While, the Weibull-based model exhibits temperature and material-dependence, ensuring a greater sensitivity range of the parameters applied, an essential factor for a more realistic method description.

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Creep behavior of HDPE/PA66 microfibrillar composites modified with graphite nanoplatelets

Cited by 6 publications

References 35 publications

Investigation the effect of processing condition and dispersed phase content on rheology–morphology relationship in polypropylene/polyethylene terephthalate microfibrillar composite

Investigation the effect of processing condition and dispersed phase content on rheology–morphology relationship in polypropylene/polyethylene terephthalate microfibrillar composite

Mechanical and viscoelastic properties of polyethylene‐based microfibrillated composites from 100% recycled resources

Statistical analysis of creep behavior in thermoset and thermoplastic composites reinforced with carbon and glass fibers

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