Influence of the elastomeric polypropylene addition on the properties of commercial metallocenic polypropylene

Marques, Maria de Fátima Vieira; Poloponsky, Mariana; Chaves, Érica Gervasoni

doi:10.1590/s1516-14392001000400006

Cited by 4 publications

(3 citation statements)

References 15 publications

(12 reference statements)

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“…Figure 1 describes the polymerization activity as a function of the Al MAO /Zr quotient for the catalyst (2‐PhInd) 2 ZrCl 2 in the polymerization of propylene. The obtained activity optimum of Al MAO /Zr = 500 is somewhat low in comparison with other metallocenes 19, 35–40. No significant decline in activity is observed with increasing Al MAO /Zr values, which is in accordance with a report by Waymouth and coworkers 41.…”

Section: Resultssupporting

confidence: 91%

Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2‐PhInd)₂ZrCl₂ Metallocene Catalyst in the Presence of Co‐Catalyst Mixtures: Study of Activity and Molecular Weight

Nejabat

Nekoomanesh

Arabi

et al. 2012

Macro Reaction Engineering

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The effect of adding various aluminum alkyls (R = Et, i‐Bu) on the polymerization of propylene is studied using a (2‐PhInd)2ZrCl2 pre‐catalyst. A mild deactivating effect is found upon addition of TIBA, whereas TEA shows a sharp deactivating effect. Increasing amounts of AlR3 results in a significant activity increase for TIBA, but an activity plateau for TEA. AlR3 imposes remarkably different effects on the molecular weight and stereochemical microstructure of polymers. As the TIBA concentration increases, $\overline {M} _{{\rm v}} $ increases at first, growing from 49 000 to 72 000, but subsequently drops to 40 000. For TEA, $\overline {M} _{{\rm v}} $ decreases sharply, plummeting from 49 000 to 17 000. Both TIBA and TEA increase the mmmm pentad content from 7.9 to 23.5% and 17.6%, respectively.

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Section: Resultssupporting

confidence: 91%

Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2‐PhInd)₂ZrCl₂ Metallocene Catalyst in the Presence of Co‐Catalyst Mixtures: Study of Activity and Molecular Weight

Nejabat

Nekoomanesh

Arabi

et al. 2012

Macro Reaction Engineering

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“…Steady state was defi ned as the state when the torque was at 110% of the value recorded after 8 min. The specifi c energy required to reach steady state was calculated by multiplying the integral of the area beneath the torque versus time curve by the rotor speed per gram of processed material, as given by the equation (28) Specific energy W = 2 n M dt…”

Section: Compound Processing and Characterisationmentioning

confidence: 99%

Ground Tyre Rubber/Waste Polypropylene Blends – Effect of Composition on Mechanical Properties

Egodage

Harper

Walpalage

2009

Progress in Rubber, Plastics and Recycling Technology

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Ground tyre rubber (GTR) was blended with waste polypropylene (WPP) in nine different compositions to prepare GTR/WPP blends. The blends were prepared in a Haake Rheocord PolyLab system at a temperature of 180 °C and a rotor speed of 30 r/min for 8 min. The processing characteristics of the blends showed an increase in steady-state mixing torque with an increase in GTR content, suggesting an increased diffi culty in processability at GTR loadings above 30 wt.%. Morphological observations of the blends showed two-phase systems. The GTR was dispersed in a continuous WPP matrix in blends containing up to 60 wt.% GTR, and the size of the dispersed GTR agglomerants increased with GTR content. At 70 wt.%, the GTR dispersed phase changed to a continuous phase. Tensile strength, modulus, and tear resistance decreased with GTR content, while the elongation at break and the impact failure energy increased. All these properties remained relatively unchanged at low GTR contents, suggesting that a critical GTR level is required to obtain rubber-like properties in a simple rubber-thermoplastic blend.

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“…Such a trend was observed in a study by Ammar et al [ 26 ], in which TC was incorporated as a reinforcing filler in a PP matrix. Note that slight changes in the T m for each sample relate to an error in measurement common for this method [ 53 ]. As the EO content increased, the intensity of the melting peak diminished, indicating reduction in enthalpy; moreover, the intensity of the melting peak reduced by decreasing of PP content in the PP/TC/EO composites as well.…”

Section: Resultsmentioning

confidence: 99%

Immobilization of Caraway Essential Oil in a Polypropylene Matrix for Antimicrobial Modification of a Polymeric Surface

et al. 2021

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This study investigates antibacterial polymer composites based on polypropylene as modified by caraway essential oil at various concentrations, the latter immobilized on a talc. The caraway essential oil is incorporated in the polypropylene by a thermoplastic processing method. Analysis of the morphology of the composites was carried out by scanning electron microscopy. The chemical composition of the caraway essential oil in addition to its efficiency of incorporation and release were evaluated by GC/MS and Pyrolysis-GC/MS techniques, respectively. Determination was made as to the influence of such incorporation on thermal and tensile properties of the samples, while antibacterial activity was evaluated through conducting disk diffusion tests and measurement with adherence to the ISO 22196:2011 standard. It was found that incorporating the caraway essential oil in the samples did not affect the homogeneity of the thermoplastic-processed composites at any studied concentration. Stress–strain analysis confirmed the plasticizing effect of the essential oil in the polypropylene matrix, in addition to which, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) analysis revealed that the prepared compositions with essential oil exhibited similar thermal properties to neat polypropylene. Results indicated significant antibacterial activity against Staphylococcus aureus and Escherichia coli at the concentration of essential oil of 4.9 ± 0.2 wt% and higher.

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Influence of the elastomeric polypropylene addition on the properties of commercial metallocenic polypropylene

Cited by 4 publications

References 15 publications

Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2‐PhInd)₂ZrCl₂ Metallocene Catalyst in the Presence of Co‐Catalyst Mixtures: Study of Activity and Molecular Weight

Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2‐PhInd)₂ZrCl₂ Metallocene Catalyst in the Presence of Co‐Catalyst Mixtures: Study of Activity and Molecular Weight

Ground Tyre Rubber/Waste Polypropylene Blends – Effect of Composition on Mechanical Properties

Immobilization of Caraway Essential Oil in a Polypropylene Matrix for Antimicrobial Modification of a Polymeric Surface

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Influence of the elastomeric polypropylene addition on the properties of commercial metallocenic polypropylene

Cited by 4 publications

References 15 publications

Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2‐PhInd)2ZrCl2 Metallocene Catalyst in the Presence of Co‐Catalyst Mixtures: Study of Activity and Molecular Weight

Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2‐PhInd)2ZrCl2 Metallocene Catalyst in the Presence of Co‐Catalyst Mixtures: Study of Activity and Molecular Weight

Ground Tyre Rubber/Waste Polypropylene Blends – Effect of Composition on Mechanical Properties

Immobilization of Caraway Essential Oil in a Polypropylene Matrix for Antimicrobial Modification of a Polymeric Surface

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Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2‐PhInd)₂ZrCl₂ Metallocene Catalyst in the Presence of Co‐Catalyst Mixtures: Study of Activity and Molecular Weight

Synthesis of Stereoblock Elastomeric Poly(propylene)s Using a (2‐PhInd)₂ZrCl₂ Metallocene Catalyst in the Presence of Co‐Catalyst Mixtures: Study of Activity and Molecular Weight