Amplification effect of platelet type nanoparticles on the orientation behavior of injection molded nylon 6 composites

Yalcin, Baris; Valladares, David; Çakmak, Mükerrem

doi:10.1016/j.polymer.2003.07.010

Cited by 95 publications

(80 citation statements)

References 32 publications

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“…[23][24][25] Widely reported, however, is the effect of traditional processing methods, involving shear or elongational flow on nanoclay orientation induced in the melt. [23,[25][26][27][28][29][30][31][32][33][34] Galgari et al [30] attempted to quantify the relationship between flow induced clay orientation and tensile modulus of extruded tapes of PP nanocomposites. Recently, Wang et al [31] tried to correlate the rheological behaviour of PP/clays with orientation and tensile properties.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Reinforcement of Highly Oriented Poly(propylene) Tapes by Sepiolite Nanoclay

Bilotti

Deng

Zhang

et al. 2010

Macro Materials & Eng

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This paper reports the properties of highly oriented nanocomposite tapes based on isotactic PP and needle‐like sepiolite nanoclay, obtained by a solid state drawing process. The intrinsic 1D character of sepiolite allows its exploitation in 1D objects, such as oriented polymer fibres and tapes, where it can be uniaxially oriented upon drawing. A synergistic increase in mechanical properties is presented for highly drawn tapes (λ ≤ 20) and low filler loadings (≤2.5 wt.‐%), which can not be simply explained by micromechanical composite models. Instead, mechanical properties are intimately related to the dispersion state of the nanoclays in PP, the rheological properties of the nanocomposites and the polymer morphology.

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Section: Introductionmentioning

confidence: 99%

Synergistic Reinforcement of Highly Oriented Poly(propylene) Tapes by Sepiolite Nanoclay

Bilotti

Deng

Zhang

et al. 2010

Macro Materials & Eng

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“…This concomitance of orientation of the chains and the talc platelets is a common feature of injectionmolded composites reinforced with filler of high aspect ratio which tend to align along the flow direction [27,33,[55][56][57]. In the case of composites with lamellar fillers, this phenomenon is enhanced by to the so-called shear-amplification effect [58]. The shear-induced nucleation can compete with filler-induced nucleation [59] and may even prevail on it [33].…”

Section: Resultsmentioning

confidence: 98%

Optimization of the crystallinity of polypropylene/submicronic-talc composites: The role of filler ratio and cooling rate

Makhlouf¹,

Satha²,

Frihi³

et al. 2016

Express Polym. Lett.

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Abstract. Micronic and submicronic mineral fillers recently appeared as efficient reinforcing agents for polyolefins in addition to the benefit of bypassing the exfoliation/dispersion problem encountered in the case of incorporation of nanoscopic fillers such as clay. Submicronic-talc, designated as µ-talc, belongs to this kind of new fillers. This work was aimed at searching to optimize the crystallinity ratio of isotactic polypropylene in the presence of µ-talc in relation to the filler ratio of the composites and the cooling rate from the melt. In order to highlight the efficiency of the µ-talc on the crystallization of polypropylene comparison has been made with PP composites containing conventional talc particles. The study has been carried out on samples having µ-talc weight fractions covering the range 3-30%. In the context of optimizing the crystallinity ratio of the polypropylene matrix in the composites, calorimetric experiments have been planned using a full factorial design. The results were statistically processed by analysis of the variance via mathematical models for predicting the crystallinity ratio in relation to the cooling rate and the filler ratio. Contour graphs have been plotted to determine the effect of each parameter on crystallinity. The cooling rate proved to have a significantly stronger influence on crystallinity than the type and content of filler.

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“…When flow is applied, the presence of these particles constituting the additives locally increases the velocity gradients [21]. As such, fillers increase the influence of flow on crystallization and crystal orientation [19], and alter mechanical properties [16]. An indication for the increased effective stretching is hard to obtain, since these particles show a large distribution of size (100 nm-10 lm) and shape differences (spherical and plate-like), which should be taken into account in the modeling.…”

Section: Rheological Propertiesmentioning

confidence: 99%

“…Several researchers studied case (b), investigating experimentally the particle-morphology-properties relationship [2,[16][17][18][19][20]. The presence of particles leads to strong molecular orientation throughout the complete sample caused by a 'shear amplification effect' between the particles and sometimes an improved impact resistance.…”

Section: Introductionmentioning

confidence: 99%

Flow-induced crystallization of propylene/ethylene random copolymers

Housmans

Peters

Meijer

2009

J Therm Anal Calorim

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The influence of the co-monomer content and processing conditions on the crystallization kinetics of propylene/ethylene (P/E) random copolymers is studied using DSC and rheometry. The presence of ethylene lowers the melting and crystallization temperature compared to pure polypropylene, and the quiescent crystallization rate, _ X; increases at equal nominal undercooling, because both the crystal growth rate, G, and number of nuclei, N, increases. The effect of flow on the kinetics of crystallization decreases with the ethylene content. Still, different regimes of flow-induced crystallization are observed, but their size and the position of the transitions between them depend on the ethylene content, and can be expressed in terms of the level of molecular orientation, molecular stretch, and crystallization capacity of the system.

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Amplification effect of platelet type nanoparticles on the orientation behavior of injection molded nylon 6 composites

Cited by 95 publications

References 32 publications

Synergistic Reinforcement of Highly Oriented Poly(propylene) Tapes by Sepiolite Nanoclay

Synergistic Reinforcement of Highly Oriented Poly(propylene) Tapes by Sepiolite Nanoclay

Optimization of the crystallinity of polypropylene/submicronic-talc composites: The role of filler ratio and cooling rate

Flow-induced crystallization of propylene/ethylene random copolymers

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