Viscoelastic properties of polypropylene/organo‐clay nano‐composites prepared using miniature lab mixing extruder from masterbatch

Ali, Mushir; Elleithy, Rabeh

doi:10.1002/app.33573

Cited by 14 publications

(14 citation statements)

References 37 publications

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“…Furthermore, it can be seen in the figure that at all range of frequencies, the modulus increased proportionally to the loading of CaCO 3 nanofillers. Similar finding were also reported by other research studies [42][43][44]. In Fig.…”

Section: Solid Viscoelastic Propertiessupporting

confidence: 93%

“…As noticed from the figure, the G′ of the nanocomposites improved by about 40 % and 50 % by addition of 10 and 20 wt% of CaCO 3 masterbatch, respectively. Several research studies reported the similar improvement in G′ as the loading of CaCO 3 increased [42,46]. The storage modulus (stiffness) improvement could be attributed to the restricted molecular mobility of HDPE chains as a result of the interaction between CaCO 3 nanoparticles and HDPE matrix.…”

Section: Thermo-mechanical Propertiesmentioning

confidence: 82%

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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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Section: Solid Viscoelastic Propertiessupporting

confidence: 93%

Section: Thermo-mechanical Propertiesmentioning

confidence: 82%

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

et al. 2012

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“…This behavior could be attributed to the presence of nanoclay platelets which hindered the molecular mobility of PP chains by decreasing the free volume. Moreover, the interaction between the nanoclay and matrix also lead to this behavior [13,16,29]. All the curves in Fig.…”

Section: Dynamic Mechanical Analysis (Dma)mentioning

confidence: 92%

“…Masterbatches has many advantages over bulk nanomaterial such as, they are dust free, have less health and safety issue whereas use of bulk nanomaterials may have harmful effects if not dealt with proper caution. Also the dispersion and distribution of nanomaterials in polymer matrix is easy when used in masterbatch form rather than when used as bulk nanomaterial [13]. Additionally, masterbatch is easy to handle because the nanomaterials are bounded inside the polymer matrix.…”

Section: Introductionmentioning

confidence: 97%

“…Instead, we can only let down the concentration of the masterbatch and vary the processing parameters. Nevertheless, using masterbatch to produce polymer nanocomposites becomes an attractive area for research in academia and industry [13,16]. There are different methods to prepare polymer nanocomposites, and one of the most widely used methods is melt blending method.…”

Section: Introductionmentioning

confidence: 99%

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Nanoindentation and dynamic mechanical properties of PP/clay nanocomposites

et al. 2012

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Polypropylene/clay nanocomposites were prepared by melt blending technique. A PP homopolymer was melt blended with commercial nanoclay masterbatch at different concentration (5, 10 and 15 wt% of nanoclay) using Laboratory Mixing Extruder (LME). The morphology of the nanocomposites was characterized using Scanning Electron Microscope (SEM). The viscoelastic and thermomechanical properties were analyzed via Dynamic Mechanical Analysis (DMA). The morphological analysis showed that the nanoclay was well distributed in the PP matrix. The DMA analysis showed an increase in storage modulus of nanocomposites which indicates an enhancement of stiffness and thermal stability of the prepared nanocomposite samples. In addition, a nanoindentation test was performed to determine the dynamic nanomechanical properties of two nanocomposites samples (NS-5 and NS-15). Load sweep test results showed that NS-15 has a slightly higher storage and loss modulus than that of NS-5. Both the samples also showed a decreasing modulus as a function of depth, indicating the presence of a stiffer surface layer in the samples. Frequency sweep tests were also performed on each sample, and display a moderate viscoelasticity with modulus values that increased slightly as a function of frequency. Loadcontrolled ramping force scratch test was also carried out and the results showed that NS-15 had a greater elastic recovery than sample NS-5 as well as a greater overall scratch resistance.

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Relationship between the morphology and interfacial tension of polypropylene and ethylene propylene diene monomer blends: The effect of repetitive extrusion

Lee

Yoo

et al. 2012

J of Applied Polymer Sci

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In this study, the effects of repeated extrusion on the mechanical properties, morphology, and interfacial tension of polypropylene (PP)/ethylene propylene diene monomer (EPDM) (80/20) blends were investigated. For the PP/EPDM (80/20) blends, the impact strength of the blends increased with repeated extrusion, which could be attributed to the interaction between the PP and the EPDM. The interfacial tension of the PP/EPDM (80/20) blends, which was determined using the Palierne and Choi-Schowalter models, decreased with an increase in the number of repeated extrusion. Based on the results of the mechanical properties and morphology, the interaction between the PP and the EPDM with repeated extrusion contributed to the reduction of interfacial tension between the PP and the EPDM, which consequently improved the impact strength of the PP/EPDM (80/20) blends. The results for the nuclear magnetic resonance studies supported the increase in impact strength of the PP/EPDM (80/20) blends with repeated extrusion.

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Viscoelastic properties of polypropylene/organo‐clay nano‐composites prepared using miniature lab mixing extruder from masterbatch

Cited by 14 publications

References 37 publications

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

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

Nanoindentation and dynamic mechanical properties of PP/clay nanocomposites

Relationship between the morphology and interfacial tension of polypropylene and ethylene propylene diene monomer blends: The effect of repetitive extrusion

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