Compatibilisation effect of PP-g-MA copolymer on iPP/SiO2 nanocomposites prepared by melt mixing

Bikiaris, Dimitrios N.; Vassiliou, A.A.; Pavlidou, E.; Karayannidis, George P.

doi:10.1016/j.eurpolymj.2005.03.008

Cited by 235 publications

(194 citation statements)

References 24 publications

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“…On the other hand, nanofiller addition produces a noticeable decrease in strain at break, probably because of strong interaction between filler and matrix [12]. Although an increase was expected as a result of smaller agglomerations, the opposite happened.…”

Section: Tensile Mechanical Behaviormentioning

confidence: 99%

“…On the other hand, these nanofillers are generally poorly dispersed in apolar thermoplastics (such as polyolefins), thus limiting their beneficial effects on the target thermo-mechanical properties. In order to enhance the dispersibility of nanofillers in polyolefins they are usually introduced after surface treatment [9][10][11] or together with suitable polymeric compatibilizers [12][13][14][15][16]. Nevertheless, with the aim of avoiding additional costs and processes, researchers have been looking for nanofillers which can be easily and homogeneously dispersed within the polymeric matrix without use of compatibilizers or surface treatments on the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…This is usually accompanied with limited reinforcing effect. Nevertheless, the compatibilization strategies between fillers and PP include the addition of polymeric compatibilizers [12,[14][15][16] and the pre-treatment of fillers with coupling agents [27][28][29][30][31].…”

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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Section: Tensile Mechanical Behaviormentioning

confidence: 99%

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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show abstract

“…However, as can be seen in Figure 2a tensile strength reduces by increasing the CN content. This behaviour is maybe due to the interactions between the nanoparticles themselves, as more and larger agglomerates are formed, which act as stress concentrators and ultimate failure points of the material [13,17]. Generally, the drop in the tensile strength has been attributed to the reduction of the polymer fraction in the transverse cross-section of the polymer [27], which becomes an even greater issue due to the extremely large surface area of the filler used, and the presence of stress concentration around the filler's particles [28].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Most products require a balance between stiffness and impact strength, and this need has been met using several nanoparticles, at loadings of 10% or less, increasing the range of the material's applications [13][14][15]. Although nanocomposites can be prepared either through melt compounding [16][17][18][19][20] solution blending [21], in situ polymerization techniques [22,23] and sol-gel reactions [24], due to its compatibility with current industrial processes, such as extrusion and injection molding, the absence of organic solvents, and its suitability with most commodity polymers, melt-mixing is 4 probably the most industrially feasible and versatile technique amongst the various strategies used for the preparation of nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposites of isotactic polypropylene with carbon nanoparticles exhibiting enhanced stiffness, thermal stability and gas barrier properties

Vassiliou¹,

Bikiaris²,

Chrissafis³

et al. 2008

Composites Science and Technology

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Stavrev, et al.. Nanocomposites of isotactic polypropylene with carbon nanoparticles exhibiting enhanced stiffness, thermal stability and gas barrier properties. Composites Science and Technology, Elsevier, 2009, 68 (3-4) AbstractCarbon nanoparticles (CN), synthesized by a shock wave propagation method from the free carbon of the explosive, were dispersed in isotactic polypropylene (iPP) using a twin screw corotating extruder. These materials were analyzed for their tensile properties, crystallization morphology, thermal stability under N 2 , O 2 and air, as well as their permeability rates for N 2 , O 2 and CO 2 . Young's modulus was significantly enhanced, as was the tensile strength at the yield point, although at a smaller extent. However, the tensile strength and elongation at the break point slightly deteriorated with the increase of the filler's concentration. This behavior was attributed to the increase tendency of CN to form aggregates into iPP matrix by increasing its content. The size of aggregates, as was evaluated by extended micro-Raman mapping, is ranged from 1 up to 5 m. The nanoparticles caused a significant reduction of the iPP chain's mobility leading to smaller and less ordered crystallites, with the appearance of -phase crystallites at CN content 5 wt%. In inert atmosphere (N 2 ) the presence of the nanoparticles caused a shift of the starting decomposition temperature (T d ), from 368 up to 418.6 o C, while, under oxygen, thermal decomposition was more complex, displaying more than two stages. The T d was slightly lowered, up to a filler content of 2.5 wt%, with the nanoparticles exhibiting a catalytic role at the beginning of the polymer's decomposition. Under air, the degradation behavior was between ACCEPTED MANUSCRIPT 2 those exhibited in inert and O 2 atmospheres. Permeability rates for the gases measured were substantially lowered with increasing filler content.

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Silicium‐Based Nanocomposite Materials for Food Packaging Applications

Radusin

Ristić

Pilić

et al. 2018

Composites Materials for Food Packaging

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Compatibilisation effect of PP-g-MA copolymer on iPP/SiO2 nanocomposites prepared by melt mixing

Cited by 235 publications

References 24 publications

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

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

Nanocomposites of isotactic polypropylene with carbon nanoparticles exhibiting enhanced stiffness, thermal stability and gas barrier properties

Silicium‐Based Nanocomposite Materials for Food Packaging Applications

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