Crystallization kinetics and nucleation activity of filler in polypropylene/surface-treated SiO2 nanocomposites

Papageorgiou, George Z.; Achilias, Dimitris S.; Bikiaris, D.; Karayannidis, George P.

doi:10.1016/j.tca.2004.09.001

Cited by 292 publications

(233 citation statements)

References 56 publications

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“…Spherulite size and morphology are important factors in the characterization of iPP, since larger spherulites often promote brittleness owing to the concentration of structural defects and impurities at their The effect on CN on iPP crystallization was also studied with WAXD. Figure It is well known that the addition of inorganic nanoparticles, such as SiO 2 , can influence the nucleation of the polymer [18], however, the formation of the -phase iPP chainfolding is much more difficult [42]. Such chainfolding is only caused under isothermal crystallization at very high pressure and for iPP of very low molecular weight fractions.…”

Section: Effect Of Carbon Black Nanoparticles On Ipp Crystallization mentioning

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%

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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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Section: Effect Of Carbon Black Nanoparticles On Ipp Crystallization mentioning

confidence: 99%

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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“…This effect of the nanofiller considerably influences the physical and mechanical properties of the polymer/nanofiller material. Therefore, incorporation of nanoadditives into a polymer matrix offers an attractive potential for diversification of conventional polymeric materials, such as iso-tactic polypropylene (PP) in various areas of technical application [1][2][3][4][5]. Nano-particles provide new application opportunities in plastic materials used in the areas of automotive, aerospace or electrical engineering industries.…”

Section: Introductionmentioning

confidence: 99%

“…The type and content of crystallinity plays an important role in the properties of oriented fibers produced for textiles. It has been found that the use of nanoadditives having the proper morphology and particle size, when compounded with polypropylene (PP) fibres induce different behaviour of the polypropylene during crystallization, as well as on the crystallization conditions [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical properties of PP modified with nano-CaCO 3 have been increased, too [18]. So, the thermal and mechanical properties of conventional polymers can be significantly influenced using fillers that act as artificial nucleating agents [3]. However, inorganic nano-particles very easily agglomerate because of their large specific surface area and high surface energy and they show poor dispersability in nonpolar polymers like PP, resulting in poor mechanical properties [18].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Inorganic Nanoadditives on the Thermal, Mechanical and UV Radiation Barrier Properties of Polypropylene Fibres

Ujhelyiová¹,

Slobodová²,

Ryba³

et al. 2012

OJOPM

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The objective of this study of modified polypropylene (PP) fibres using nanoadditives (nano-CaCO 3 and Cloisite 30B) was to determine the influence of these additives on thermal and mechanical properties, but especially on the barrier properties of the nanocomposite fibres against UV radiation. The DSC data obtained from measurements of PP/CaCO 3 or PP/C30B nanocomposite fibres were used for determination of the constants n and K of the Avrami equation and in the estimation of other thermal properties of the fibres, such as their crystallization half-time t 1/2 , rate of crystallization  1/2 , the necessary time for maximum crystallization t max and free energy per unit area of surface in the lamella perpendicular to the axis of a high-molecular chain  e . The nano-CaCO 3 or Closite 30B fillers (pre-treated separately in three different solvents: glycerine, acetone and water) did not influence the melting temperatures but caused an increase in PP crystallization temperatures in comparison with the pure PP fibres. The pre-treatments of nanoadditives resulted in increase of n, K,  1/2 values and decrease of t 1/2 , t max as well as the values of free surface energies per unit area of the modified PP fibres. There was also observed a decrease in the mechanical properties, however, there was an increase of barrier properties against UV radiation of nanocomposite PP fibres in comparison with neat PP fibres, which was one of the main objectives of the study.

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Nanoparticles and Polymer Nanocomposites

Jiménez

Lee

Jana

2011

Nanoscale Multifunctional Materials

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Crystallization kinetics and nucleation activity of filler in polypropylene/surface-treated SiO2 nanocomposites

Cited by 292 publications

References 56 publications

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

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

The Effect of Inorganic Nanoadditives on the Thermal, Mechanical and UV Radiation Barrier Properties of Polypropylene Fibres

Nanoparticles and Polymer Nanocomposites

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