Shear characterization of CaCO3-filled linear low density polyethylene

Ottani, Stefano; Valenza, A.; Mantia, Francesco Paolo La

doi:10.1007/bf01331902

Cited by 18 publications

(8 citation statements)

References 28 publications

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“…The BSR and the MS values are almost unaffected by the presence of the solid nanoparticles and small differences can be observed only at high concentrations of the filler. The presence of relatively high amounts of these fillers does not worse, then, the processability in elongational flow as occurs, on the contrary, in the conventional filled polymers 15…”

Section: Resultsmentioning

confidence: 99%

EVA Copolymer Based Nanocomposites

Mantia

Verso

Dintcheva

2002

Macro Materials & Eng

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Nanocomposites are a new class of polymer material with an ultrafine phase dispersion of the order of a few nanometers that shows very interesting properties often very different from those of conventional filled polymers. In this work the mechanical and optical properties of Poly[ethylene‐co‐(vinyl acetate)] (EVA copolymer) based nanocomposites have been investigated to evaluate its possible use in several applications. For example, films for covering greenhouses made by EVA copolymer are appealing because of their interesting optical properties and for the so‐called greenhouse effect. Mechanical properties, and the rigidity in particular, are, on the contrary, quite low. Nanocomposites should avoid this shortcoming if optical properties and processability are not unfavorably effected. EVA copolymer based nanocomposites have been prepared by compounding polymer matrix and two different functionalized silicates (0–10 wt.‐%) in molten state. X‐Ray diffractograms show that the in the adopted experimental conditions no exfoliation of the filler is obtained, but an intercalated morphology is observed. Rheological behavior both in shear and in non‐isothermal elongational flow is only slightly influenced by the presence of the filler. As for the mechanical properties, the elastic modulus strongly increases without any worsening of the elongation at break. The permeability in the UV region is not influenced by adding even relatively high contents of the silicates. The improved mechanical and optical properties and the unmodified processability suggest then the use of these new polymeric systems in many applications and in particular as films for covering greenhouses. UV spectra of the EVA/Nanofil system.magnified imageUV spectra of the EVA/Nanofil system.

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Section: Resultsmentioning

confidence: 99%

EVA Copolymer Based Nanocomposites

Mantia

Verso

Dintcheva

2002

Macro Materials & Eng

Self Cite

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“…These gel‐like structures are due to the matrix‐fiber interactions and exert a resistance to the flow which finds its macroscopic outcome in the appearance of a yield stress. When the shear rate increases, however, the gel‐like structures are disrupted and the filled materials behave basically as a suspension of solid particles in a melt phase 37–39…”

Section: Resultsmentioning

confidence: 99%

Effect of the processing techniques on the properties of ecocomposites based on vegetable oil‐derived Mater‐Bi® and wood flour

Scaffaro

Morreale

et al. 2009

J of Applied Polymer Sci

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Polymer composites based on biodegradable polymers and natural-organic fillers are becoming more and more important because of their interesting properties in terms of environmental impact, manufacturing cost, and esthetic features. In particular, the use of biodegradable polymer matrices allows obtaining a full biodegradability. One of the most interesting biodegradable polymer families is the Mater-Bi V R one. In this work, we investigated the processability, the influence of different processing techniques, and the influence of the filler particle size on the properties of Mater-Bi/wood flour composites. Injection molding caused a partial degradation of the macromolecular chains, whereas single-screw extrusion followed by calendering and twin-screw extrusion provoked an increase of the elastic modulus and of the viscosity. The use of wood flour led to a significant increase of the rigidity, whereas a reduction of the ductility was observed. Because of the very similar aspect ratios of the two different filler size classes, no dramatic differences in the properties were found. These results are useful in order predicting and setting up the optimum preparation and processing strategy for the production of fully biodegradable polymer composites.

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“…Probably, structural changes occur during the annealing treatment; in fact the curve of the storage modulus of 9 h annealed sample is typical of structured polymer systems, like liquid crystal polymers25–26 and cross‐linked polymers27 or of highly filled systems 28–29…”

Section: Resultsmentioning

confidence: 99%

Rheological Response of Polyethylene/Clay Nanocomposites to Annealing Treatment

Botta

Mantia

Dintcheva

et al. 2007

Macro Chemistry & Physics

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The rheological response of a polyethylene/clay nanocomposite to annealing treatment under air and nitrogen atmospheres was studied. The treatment influences the rheology of the nanocomposite significantly. In particular, the viscosity and the non-Newtonian behavior dramatically increase with annealing time, and a liquid-like/solid-like transition is observed. The annealed samples were characterized by ATR-FT-IR spectrometry and it was shown that a silicate-rich layer is formed on the surface of the nanocomposite. This result was confirmed by TEM images of bulk and surface of annealed samples. It was demonstrated that the formation of this coating is the main cause of the change of rheological behavior

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Shear characterization of CaCO3-filled linear low density polyethylene

Cited by 18 publications

References 28 publications

EVA Copolymer Based Nanocomposites

EVA Copolymer Based Nanocomposites

Effect of the processing techniques on the properties of ecocomposites based on vegetable oil‐derived Mater‐Bi® and wood flour

Rheological Response of Polyethylene/Clay Nanocomposites to Annealing Treatment

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