Cover Picture: Macromol. Mater. Eng. 10/2015

Arunachalam, Sundaresan; Battisti, Markus; Vijayakumar, Chinnaswamy Thangavel; Friesenbichler, Walter

doi:10.1002/mame.201570029

Cited by 3 publications

(8 citation statements)

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“…The composite melt was extruded rather through an elongated hyperbolic shaped nozzle, which facilitates better intercalation of the nanofiller in the polymer matrix. More details on the processing of polypropylene/OMMT nanocomposites can be found in the previous report …”

Section: Methodsmentioning

confidence: 87%

“…[22] The polypropylene and PP-MA were fed upstream through the main hopper of the IMC, which has a screw diameter (D) of 27 mm and extruder length 44 D. The nanofiller OMMT was fed downstream and all the three constituents of the composite were fed separately in controlled gravimetric dosage units. [4] The processing conditions inside the IMC were kept constant throughout the process. The composite melt was extruded rather through an elongated hyperbolic shaped nozzle, which facilitates better intercalation of the nanofiller in the polymer matrix.…”

Section: Preparation Of Compositesmentioning

confidence: 99%

“…Even the addition of smaller weight proportions (say less than 5%) of clay nanoparticles have improved both the mechanical and thermal properties of polypropylene . The resulting properties of the nanocomposites depend on numerous factors including size, shape, geometry, the orientation of the filler, and polymer–filler interactions in the matrix …”

Section: Introductionmentioning

confidence: 99%

“…A significant improvement in the mechanical properties, Young's modulus, and yield stress has been reported in the previous study. However, the thermal properties and its thermal degradation kinetics were not studied extensively in the previous study . Thus the aim of the present work is to study the thermal degradation kinetics of the polypropylene/clay nanocomposites with different levels of compatibilizer.…”

Section: Introductionmentioning

confidence: 99%

“…Even the addition of smaller weight proportions (say less than 5%) of clay nanoparticles have improved both the mechanical and thermal properties of polypropylene. [2][3][4] The resulting properties of the nanocomposites depend on numerous factors including size, shape, geometry, the orientation of the filler, and polymer-filler interactions in the matrix. [5] One of the abundantly used clay nanoparticles, the layered silicates have shown significant improvement in the mechanical and thermal properties of the composites.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Thermal Degradation Kinetics of Polypropylene/Organically Modified Montmorillonite Nanocomposites with Different Levels of Compatibilizer

Vimalathithan

Barile

Casavola

et al. 2018

Macro Materials & Eng

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Polypropylene/organically modified montmorillonite (OMMT) nanocomposites are prepared with different levels of compatibilizer (maleic anhydride functionalized polypropylene) and OMMT. A specially designed polymer nanocomposite injection molding compounder with a hyperbolic nozzle is used to prepare the nanocomposites. The thermal kinetic parameters, the activation energy, pre‐exponential factor, and the reaction model are estimated using isoconversional methods. The activation energy of virgin polypropylene is slightly higher than the polypropylene/OMMT nanocomposites. However, the presence of the compatibilizer is the vital reason for the lower activation energy in the polypropylene/OMMT nanocomposites. The reaction model explains the complexity of the reaction in the presence of OMMT and its influence on the accelerated charring in the later stages of degradation. The optimum working temperature of the prepared polypropylene/clay nanocomposites is significantly higher thus proving that OMMT improves the thermal stability of the nanocomposites. The polypropylene with 5% OMMT and 10% compatibilizer in its weight proportion has the optimum working temperature of 198 °C for 20 000 h before losing its integrity.

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Section: Methodsmentioning

confidence: 87%

Section: Preparation Of Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation on the Thermal Degradation Kinetics of Polypropylene/Organically Modified Montmorillonite Nanocomposites with Different Levels of Compatibilizer

Vimalathithan

Barile

Casavola

et al. 2018

Macro Materials & Eng

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Influence of elongational flow generating nozzles on material properties of polypropylene nanocomposites

Battisti

Perko

Arunachalam

et al. 2016

Polymer Engineering & Sci

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In this study, polymer nanocomposites (PNCs) based on polypropylene (PP), organoclay (used as nanoclay), and compatibilizer were prepared by a masterbatch (MB or two‐step) as well as by a one‐step process. These compounds were then injection molded into tensile test specimens and rectangular plates using conically and hyperbolically shaped nozzles. The use of these nozzles in the injection unit was to enhance intercalation and exfoliation in the PNCs by means of elongational flow. The pressure loss and temperature rise in the compound induced by this flow were characterized in temperature and pressure measurements. An additional calculation using a new analytic model showed good correlation with the measured values for the conically shaped nozzles whereas the pressure drops in the hyperbolically shaped nozzles were underpredicted. Mechanical as well as rheological characterizations were performed on the produced test specimens. The compounds from the MB process showed good intercalation and exfoliation and improved mechanical properties without any special elongational flow treatment. Similar properties were achieved with the one‐step process and elongational treatment using a short hyperbolically or conically shaped nozzle. These results indicated that it was possible to eliminate one complete compounding step and achieve the same mechanical properties in polypropylene nanocomposites when elongational elements were used. POLYM. ENG. SCI., 58:3–12, 2018. © 2016 Society of Plastics Engineers

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The effect of soluble β‐nucleator's content on crystalline structure and performance of polypropylene pipe

Guo

Zhang

Nie

et al. 2020

Vinyl Additive Technology

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Strength-toughness clash of polypropylene (PP) pipe is an insurmountable bottleneck for the potential application. Here, we successfully prepared PP pipe with simultaneously enhanced toughness and hoop strength via addition of soluble β-nucleators (β-NAs) and application of helical flow in the extrusion. The outstanding combination of strength and toughness in the PP pipe depended on the loading content of β-NAs and the helical pattern, which determined the morphology and alignment of β-crystals. At the low content, β-NAs dissolved completely into the PP melts and distributed homogeneously to promote the formation of β-spherulites in the PP pipe. When the loading content exceeded the solubility limit, the β-NAs partially dissolved and upon cooling, the dissolved β-NAs grew preferentially on the undissolved ones along one direction, assembling into the fibrous aggregates. With the guidance of helical flow, the fibrous β-NAs aligned off the axis and functioned as an oriented template to trigger the PP crystallization on the surface into hybrid β-shish-kebab with fibrous β-NAs as shish. Increasing rotation speed of mandrel and die elevated hoop contribution to obtain the β-shish-kebab with a deviated angle of 55 , endowing the prepared pipe with high hoop strength and toughness.

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Cover Picture: Macromol. Mater. Eng. 10/2015

Cited by 3 publications

References 0 publications

Investigation on the Thermal Degradation Kinetics of Polypropylene/Organically Modified Montmorillonite Nanocomposites with Different Levels of Compatibilizer

Investigation on the Thermal Degradation Kinetics of Polypropylene/Organically Modified Montmorillonite Nanocomposites with Different Levels of Compatibilizer

Influence of elongational flow generating nozzles on material properties of polypropylene nanocomposites

The effect of soluble β‐nucleator's content on crystalline structure and performance of polypropylene pipe

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