Improved fracture toughness of immiscible polypropylene/ethylene-co-vinyl acetate blends with multiwalled carbon nanotubes

Liu, Li; Wang, Yong; Li, Yanli; Wu, Jun; Zhou, Zuowan; Jiang, Chongxi

doi:10.1016/j.polymer.2009.04.067

Cited by 78 publications

(44 citation statements)

References 18 publications

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“…It may be related to the increase in the viscosity ratio of EPDM and PP phases by increasing the SWNT content, causing the droplet break-up process to become more difficult and a heterogeneous dispersed phase distribution was formed, which indicated that the interfacial adhesion was very weak. 43,44 This behavior has also been observed by rheological studies. Figure 11 shows the electrical conductivity of PP/EPDM and its nanocomposites with different SWNT contents.…”

Section: Narimani and Hemmati 941supporting

confidence: 70%

“…12 The results showed that the tensile strength reached to the maximum at 0.5 wt% SWNT by 21.81%, compared with PP/EPDM, due to the better dispersion and interaction of SWNT and the matrix. 24,26,43 Then, it decreased by 7% with increasing SWNT to 5 wt%. This was due to the inability of SWNT to support stresses transferred from matrix.…”

Section: Narimani and Hemmati 941mentioning

confidence: 97%

“…It was observed that when 0.5 wt% SWNT was added, EPDM particles are more finely dispersed in the PP matrix due to interfacial adhesion between PP and EPDM, which was strengthened by the bridge effect of SWNT in the interface. 42,43 This effect was not considerable by increasing SWNT content up to 5 wt%. It may be related to the increase in the viscosity ratio of EPDM and PP phases by increasing the SWNT content, causing the droplet break-up process to become more difficult and a heterogeneous dispersed phase distribution was formed, which indicated that the interfacial adhesion was very weak.…”

Section: Narimani and Hemmati 941mentioning

confidence: 97%

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Study on the electrical and rheological percolation threshold of single-walled carbon nanotube-reinforced thermoplastic elastomer based on polypropylene/ethylene–propylene–diene monomer nanocomposite

Narimani

Hemmati²

2013

Journal of Thermoplastic Composite Materials

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The rheological and electrical percolation threshold of single-walled carbon nanotube (SWNT)-reinforced thermoplastic elastomer based on polypropylene/ethylene-propylene-diene monomer (PP/EPDM; 80/20) nanocomposite was investigated by melt-mixing process. The rheological properties revealed that the addition of SWNT increased the shear stress and shear viscosity. Both PP/EPDM and its nanocomposites exhibited non-Newtonian behavior. It was also found that the materials experience a fluid-solid transition at 0.5 wt% SWNT. The steady shear behaviors and die swell decreased with increasing temperature. The maximum flow activation energy corresponding to the minimum die swell was also observed. The scanning electron microscopic morphology of the PP/EPDM/SWNT nanocomposites showed that the EPDM particles were dispersed through PP and the size of dispersed phase decreased with the introduction of SWNT to 0.5 wt%. The electrical percolation threshold was formed at approximately 1 wt% of SWNT. In addition, difference between electrical and rheological percolation thresholds was observed due to the nanotube-nanotube distance after the formation of the percolating network.

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Section: Narimani and Hemmati 941supporting

confidence: 70%

Section: Narimani and Hemmati 941mentioning

confidence: 97%

Section: Narimani and Hemmati 941mentioning

confidence: 97%

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Study on the electrical and rheological percolation threshold of single-walled carbon nanotube-reinforced thermoplastic elastomer based on polypropylene/ethylene–propylene–diene monomer nanocomposite

Narimani

Hemmati²

2013

Journal of Thermoplastic Composite Materials

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“…Recently, different mechanisms for changes in the interfacial tension due to the dispersion of functionalized multi-walled carbon nanotubes layers in immiscible polymer blends have been discussed extensively by Fenouillot et al [20] and Liu et al [21]. …”

Section: Dynamic-mechanical Behavior Of Samplesmentioning

confidence: 99%

Dynamic mechanical analysis and thermal properties of LLDPE/EVA/modified silica nanocomposites

Khonakdar

2015

Composites Part B: Engineering

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“…16 Sivaramana et al 17 reported the fracture toughness of thermoplastic copoly (ether ester) elastomer and ABS blends. Liu et al 18 showed the improvement of fracture toughness of immiscible polypropylene/ethylene-co-vinyl acetate blends with multiwalled carbon nanotubees. Toughness mechanism in semicrystalline polymer such as high-density polyethylene toughened with rubbers has also been reported.…”

Section: Introductionmentioning

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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Improved fracture toughness of immiscible polypropylene/ethylene-co-vinyl acetate blends with multiwalled carbon nanotubes

Cited by 78 publications

References 18 publications

Study on the electrical and rheological percolation threshold of single-walled carbon nanotube-reinforced thermoplastic elastomer based on polypropylene/ethylene–propylene–diene monomer nanocomposite

Study on the electrical and rheological percolation threshold of single-walled carbon nanotube-reinforced thermoplastic elastomer based on polypropylene/ethylene–propylene–diene monomer nanocomposite

Dynamic mechanical analysis and thermal properties of LLDPE/EVA/modified silica nanocomposites

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

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Improved fracture toughness of immiscible polypropylene/ethylene-co-vinyl acetate blends with multiwalled carbon nanotubes

Cited by 78 publications

References 18 publications

Study on the electrical and rheological percolation threshold of single-walled carbon nanotube-reinforced thermoplastic elastomer based on polypropylene/ethylene–propylene–diene monomer nanocomposite

Study on the electrical and rheological percolation threshold of single-walled carbon nanotube-reinforced thermoplastic elastomer based on polypropylene/ethylene–propylene–diene monomer nanocomposite

Dynamic mechanical analysis and thermal properties of LLDPE/EVA/modified silica nanocomposites

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

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