Effect of both uncoated and coated calcium carbonate on fracture toughness of HDPE/CaCO<sub>3</sub> nanocomposites

Sahebian, Samaneh; Zebarjad, Seyed Mojtaba; Sajjadi, Seyed Abdolkarim; Sherafat, Z.; Lazzeri, Andrea

doi:10.1002/app.25644

Cited by 82 publications

(72 citation statements)

References 33 publications

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“…The melting point of neat HDPE is recorded at 127 C and the heat of fusion is 148.8 J/ g, while the melting points of HDPE with nanocomposites were also similar with the appeared differences being negligible (0.1-0.3 C). Sahebian et al 32 reported that nanosized calcium carbonate in HDPE/CaCO 3 nanocomposites present a significant effect on crystallinity, crystallization rates, melting point, and heat of melting of HDPE. Such a behavior was also observed using SiO 2 and MMT where the crystallization rates in both nanocomposites are higher, compared with neat HDPE, but the degree of crystallinity was reduced.…”

Section: Thermal Analysismentioning

confidence: 99%

Comparative study of the effect of different nanoparticles on the mechanical properties, permeability, and thermal degradation mechanism of HDPE

Chrissafis

Paraskevopoulos

Tsiaoussis

et al. 2009

J of Applied Polymer Sci

104

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In the present study, different series of high-density polyethylene (HDPE) nanocomposites were prepared by melt mixing on a Haake-Buchler Reomixer, containing 2.5 wt % of multiwall carbon nanotubes, pristine and modified montmorillonite, surface-treated anduntreated SiO 2 nanoparticles. From transmission electron micrographs, it was found that beyond a fine dispersion of nanoparticles into HDPE matrix, there are also some aggregates easily discriminated. As a result, there was a decrease in the tensile and impact strength of most of nanocomposites except Young's modulus, which was increased. Storage modulus as recorded from dynamic mechanical analysis was also increased in all nanocomposites, because HDPE becomes stiffer due to the incorporation of nanoparticles. The nucleation behavior of nanoparticles during crystallization was found to have no obvious effect on melting and crystallization temperature of HDPE. However, a small decrease in the heat of fusion in all nanocomposites was evidenced. Gas permeability of HDPE matrix in O 2 , N 2 , and CO 2 was reduced in all nanocomposites compared with neat polymer. Thermal stability of HDPE was also enhanced due to the incorporation of different nanoparticles. From the kinetic analysis of thermal decomposition of HDPE, it was concluded that to describe the thermal degradation of HDPE and the studied nanocomposites, two consecutive mechanisms of nth-order autocatalysis have to be considered.

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Section: Thermal Analysismentioning

confidence: 99%

Comparative study of the effect of different nanoparticles on the mechanical properties, permeability, and thermal degradation mechanism of HDPE

Chrissafis

Paraskevopoulos

Tsiaoussis

et al. 2009

J of Applied Polymer Sci

104

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“…Compared to the neat HDPE-54 the fracture toughness of the composite samples decreased by about 50%. Similarly Zabardi et al 36 reported 37% reduction of fracture toughness of HDPE CaCO 3 nanocomposite at a similar CaCO 3 loading. In other words, addition of CaCO 3 led the composites samples toward brittle behavior.…”

Section: Fracture Toughnessmentioning

confidence: 91%

“…Uncoated CaCO 3 particles tend to aggregate and, as mentioned earlier, the agglomerated particles acted as stress concentrator points, hence reducing the fracture toughness and promote brittle fracture. [36][37][38][39] Moreover, from the morphological investigation of the fracture samples it was evident that there is no or little adhesion between the CaCO 3 particles and the HDPE polymer matrix. Since the filler/matrix interface is not strong enough thus deformation of the matrix interface is not the dominated energy absorption mechanism but rather debonding is suggested to be the controlling mechanism.…”

Section: Fracture Toughnessmentioning

confidence: 99%

Toughness of HDPE/CaCO₃ microcomposites prepared from masterbatch by melt blend method

Ali

Elleithy

2011

J of Applied Polymer Sci

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In this study, a series of high-density polyethylene and micro/nanocalcium carbonate polymer composites (HDPE/CaCO 3 nanocomposites) were prepared via melt blend technique using a twin screw extruder. Nanocomposite samples were prepared via injection molding for further testing. The effect of % loading of CaCO 3 on mechanical and fracture toughness of these composites has been investigated in details. The effect of precrack length variation on the fracture toughness of the composite samples was evaluated, and the morphology of the fractured samples was also observed using scanning electron microscopy (SEM). It was found that increasing the % of CaCO 3 and precrack length decreased the fracture toughness. Fracture surface examination by SEM indicated that the diminished fracture properties in the composites were caused by the aglomerization of CaCO 3 particles which acted as stress concentrators. A finite element analysis using ANSYS was also carried out to understand the effect of agglomeration size, interaction between the particles and crack tip length on the fracture properties of these composites. Finally, a schematic presentation of the envisioned fracture processes was proposed.

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“…An improvement on thermal properties [4,[12][13][14][15], stiffness [5,[16][17][18][19][20], rheological properties [12,16,18,21] has been reported. While, several research studies have also been done in field of HDPE/CaCO 3 nanocomposites [3,4,18,[22][23][24].…”

Section: Introductionmentioning

confidence: 98%

Atomic Force Microscopy, thermal, viscoelastic and mechanical properties of HDPE/CaCO3 nanocomposites

et al. 2012

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High Density Polyethylene (HDPE) and calcium carbonate (CaCO 3 ) nanocomposites were prepared from masterbatch by melt blending in twin screw extruder (TSE). The physical properties of HDPE/CaCO 3 nanocomposites samples (0, 10 and 20 wt% CaCO 3 masterbatch) were investigated. The morphology, thermal, rheological/ viscoelastic and mechanical properties of the nanocomposites were characterized by Atomic Force microscopy (AFM), Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analyzer (DMA) as well as tensile test. The AFM images showed homogeneous dispersion and distribution of nano-CaCO 3 in the HDPE matrix. The DSC analysis showed a decrease in crystallinity of HDPE/CaCO 3 nanocomposites with the increase of CaCO 3 loading. This was due to the presence of nanofiller which could restrict the movement of the polymer chain segments and reduced the free volume/spaces available to be occupied by the macromolecules, thus, hindered the crystal growth. However, there was an increase in crystallization temperature about 1-2°C with the addition of CaCO 3 . It was suggested that the CaCO 3 nanoparticles acted as nucleating agent. In melt rheology study, the complex viscosities of HDPE/CaCO 3 nanocomposites were higher than the HDPE matrix and increased with the increasing of CaCO 3 masterbatch loading. The DMA results showed that the storage modulus increased with the increasing of nano-CaCO 3 contents. The improvement was more than 40 %, as compared to that of neat HDPE. Additionally, the tensile test results showed that with the addition of CaCO 3 masterbatch, modulus elasticity of nanocomposites sample increased while yield stress decreased.

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Effect of both uncoated and coated calcium carbonate on fracture toughness of HDPE/CaCO₃ nanocomposites

Cited by 82 publications

References 33 publications

Comparative study of the effect of different nanoparticles on the mechanical properties, permeability, and thermal degradation mechanism of HDPE

Comparative study of the effect of different nanoparticles on the mechanical properties, permeability, and thermal degradation mechanism of HDPE

Toughness of HDPE/CaCO₃ microcomposites prepared from masterbatch by melt blend method

Atomic Force Microscopy, thermal, viscoelastic and mechanical properties of HDPE/CaCO3 nanocomposites

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Effect of both uncoated and coated calcium carbonate on fracture toughness of HDPE/CaCO3 nanocomposites

Cited by 82 publications

References 33 publications

Comparative study of the effect of different nanoparticles on the mechanical properties, permeability, and thermal degradation mechanism of HDPE

Comparative study of the effect of different nanoparticles on the mechanical properties, permeability, and thermal degradation mechanism of HDPE

Toughness of HDPE/CaCO3 microcomposites prepared from masterbatch by melt blend method

Atomic Force Microscopy, thermal, viscoelastic and mechanical properties of HDPE/CaCO3 nanocomposites

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Effect of both uncoated and coated calcium carbonate on fracture toughness of HDPE/CaCO₃ nanocomposites

Toughness of HDPE/CaCO₃ microcomposites prepared from masterbatch by melt blend method