Polyethylene/synthetic boehmite alumina nanocomposites: Structure, thermal and rheological properties

Khumalo, Vincent; Karger‐Kocsis, J.; Thomann, Ralf; Freiburg, Albert-Ludwigs-Universität

doi:10.3144/expresspolymlett.2010.34

Cited by 56 publications

(55 citation statements)

References 25 publications

(35 reference statements)

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“…This was usually reflected by a shift toward higher temperatures in the related thermogravimetric analysis (TGA) traces when comparing those of the plain and nanomodified polymer, respectively. This behavior was reported for low density and linear low density polyethylene (LDPE and LLDPE, respectively) modified with copper nanoparticles [2], layered double hydroxides [3][4], layered silicates (clays) [3,[5][6], silica [5], chalk [7], multiwall carbon nanotubes [8][9], alumina [10][11] and boehmite alumina [12][13]. Similar results were reported for fumed silica filled high density PE nanocomposites [14][15].…”

Section: Introductionsupporting

confidence: 71%

Thermooxidative degradation of LDPE nanocomposites: Effect of surface treatments of fumed silica and boehmite alumina

Vuorinen

Nhlapo

Mafa

et al. 2013

Polymer Degradation and Stability

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Fumed silica (FS) and synthetic boehmite alumina (BA) with and without surface treatments were incorporated in 5 wt. % in low density polyethylene (LDPE) through melt blending. FS was treated by hexadecyl silane, whereas BA by octyl silane and alkylbenzene sulfonic acid.The related nanocomposites were subjected to pyrolysis gas chromatography-mass spectomertry (Py-GC-MS) and thermogravimetric analysis (TGA) under isothermal and dynamic conditions, respectively. Py-GC-MS results proved that the thermal degradation mechanism did not change in presence of the nanofillers. The latter suppressed the formation of high molecular weight hydrocarbons and affected the relative amounts of diene/alkene/alkane fragments for each hydrocarbon fraction.Dynamic TGA scans were registered at different heating rates in air. The activation energy (E α ) of thermoxidative degradation was calculated by the Ozawa-Flynn-Wall (OFW) method at various degradation degrees. E α of the LDPE nanocomposites depended on both specific surface area and surface treatment of the nanofillers used. The former enhanced whereas the latter decreased the activation energy for the LDPE-FS nanocomposites. By contrast, E α was slightly increased for the surface treated LDPE-BA nanocomposites.

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Section: Introductionsupporting

confidence: 71%

Thermooxidative degradation of LDPE nanocomposites: Effect of surface treatments of fumed silica and boehmite alumina

Vuorinen

Nhlapo

Mafa

et al. 2013

Polymer Degradation and Stability

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“…3 for PP and PP/BA40 nanocomposites. Improved thermal and thermooxidative stability due to the addition of BA has been already reported for PEs [19], PP [35,36] and linear low density polyethylene [37]. It was recently demonstrated on LDPE/BA nanocomposites that the improved resistance of the thermooxidative stability due to BA filling is exclusively of physical origin and linked with the barrier effect of the nanoparticles hampering the diffusion of the gaseous degradation products [38].…”

Section: Thermal Propertiesmentioning

confidence: 98%

“…It was found that BA was nanoscale dispersed within these matrices and did not influence the rheological properties of the corresponding PEs. On the other hand, BA dramatically enhanced the resistance to thermo-oxidative degradation of PEs [19]. Furthermore, it was found that BA worked as reinforcing filler according to quasi-static mechanical tests and dynamic mechanical thermal analysis (DMTA).…”

Section: Introductionmentioning

confidence: 99%

“…Surface functionalization occurred by octylsilane (BA40-OS) and by C10-C13 alkylbenzene sulphonic acid (BA40-OS2), respectively. The nominal primary crystallite size of the pristine form is 40 nm, while the specific surface area is 105 m 2 ·g -1 [19]. BA was incorporated into the PP in 2.5, 5 and 10 wt%, respectively.…”

Section: Materials and Samples Preparationmentioning

confidence: 99%

“…With this regards, synthetic boehmite alumina (BA), with chemical composition n-AlO(OH),represents an ideal candidate thanks to its inexpensive and easy production process [17][18][19][20]. Its primary particle size is in the range of tens of nanometers.…”

Section: Introductionmentioning

confidence: 99%

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Thermal, viscoelastic and mechanical behavior of polypropylene with synthetic boehmite alumina nanoparticles

Pedrazzoli¹,

Khumalo²,

Karger‐Kocsis³

et al. 2014

Polymer Testing

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Effects of nanofiller concentration and surface treatments on the morphology, thermal, viscoelastic and mechanical behaviors of polypropylene copolymer (PP)/boehmite alumina (BA) nanocomposites were investigated. Both untreated and treated BA particles with octylsilane (OS) and with sulphonic acid compound (OS2) were added up to 10 wt% to produce nanocomposites by melt mixing followed by film blow molding and hot pressing. Dispersion of BA was studied by scanning electron microscopy. Differential scanning calorimetry and wide-angle X-ray scattering were adopted to detect changes in the crystalline structure of PP. Thermooxidative degradation of the nanocomposites was assessed by thermogravimetrical analysis. Dynamic mechanical analysis served for studying the viscoelastic, whereas quasi-static tensile, creep and Elmendorf tear tests were used to detect changes in the mechanical performance. BA nanoparticles were finely dispersed in PP up to 10 wt%, even when they were not surface modified. The resistance to thermal degradation was markedly improved by BA nanomodification. Changes observed in the mechanical properties were attributed to BA dispersion, filler/matrix interactions and related effects because the crystalline characteristics of the PP matrix practically did not change with BA modification.

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Rheology and Processing of Inorganic Nanomaterials and Quantum Dots/Polymer Nanocomposites

Mohan

Abraham

Oluwafemi

et al. 2016

Rheology and Processing of Polymer Nanocomposites

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Polyethylene/synthetic boehmite alumina nanocomposites: Structure, thermal and rheological properties

Cited by 56 publications

References 25 publications

Thermooxidative degradation of LDPE nanocomposites: Effect of surface treatments of fumed silica and boehmite alumina

Thermooxidative degradation of LDPE nanocomposites: Effect of surface treatments of fumed silica and boehmite alumina

Thermal, viscoelastic and mechanical behavior of polypropylene with synthetic boehmite alumina nanoparticles

Rheology and Processing of Inorganic Nanomaterials and Quantum Dots/Polymer Nanocomposites

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