Rheological and mechanical properties of nylon 6 nanocomposites submitted to reprocessing with single and twin screw extruders

Russo, Giovanna; Nicolais, V.; Maio, Luciano Di; Montesano, Simona; Incarnato, Loredana

doi:10.1016/j.polymdegradstab.2007.06.010

Cited by 52 publications

(49 citation statements)

References 28 publications

(23 reference statements)

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“…Such result, according to the scientific literature, can be likely ascribed to the supplementary stresses induced on the blend by the second processing. This would allow a further dispersion/redistribution of the nanofiller with consequent higher intercalation level [32][33][34].…”

Section: Results and Discussion 31 X-ray Diffractometry (Xrd)mentioning

confidence: 99%

“…Moreover, in order to understand the possible different interactions of neat and degraded modified clay, composites were prepared in the melt and fully characterized. There are several works regarding the effect of reprocessing on the morphology and on the properties of polymer based nanocomposites, but to the best of our knowledge no similar studies was performed on nanocomposite based on polymer blends [29][30][31][32][33][34]. Aim of this work is to evaluate the influence of morphology, at nano and micro scale, achieved by different processing methods on the rheological and mechanical properties of blends of PA6/HDPE in the presence of OMM and different compatibilizing systems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Processing – morphology – property relationships of polyamide 6/polyethylene blend–clay nanocomposites

Scaffaro¹,

Botta²,

Mistretta³

et al. 2013

Express Polym. Lett.

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Abstract. In this work, we studied the effect of the method of preparation and of reprocessing on the morphology and, consequently, on the physical properties of polyamide 6 (PA6)/ high density polyethylene (HDPE)-clay nanocomposite blends in the presence of different compatibilizers. In particular, the nanocomposites were obtained by melt mixing using a corotating twin screw extruder (E1). The blends thus obtained were re-extruded (E2) under the same operating conditions. Moreover, blends with the same final composition were produced using a masterbatch of the compatibilizer with the clay prepared in a separated stage in a batch mixer (MB). All the materials were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffractometry (XRD) analyses. In addition, the rheological behaviour and the, tensile and impact, properties were evaluated. The XRD and TEM analysis showed that re-extrusion slightly improves the morphology of the nanocomposites. A further improvement of the morphology, in terms of lower clay dimension and better dispersion, was observed in the MB blends. The results of the mechanical tests showed that reprocessing (E2) induced an increase of all the properties for all the three systems. A further general increase of the mechanical properties was showed by the MB blends.

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Section: Results and Discussion 31 X-ray Diffractometry (Xrd)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Processing – morphology – property relationships of polyamide 6/polyethylene blend–clay nanocomposites

Scaffaro¹,

Botta²,

Mistretta³

et al. 2013

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…On the other hand, Marras, Kladi, Tsivintzelis, Zuburtikudis, and Panayiotou (2008) reported that the elongation of poly (e-caprolactone) (PCL) was not impaired by MMT. Other authors observed improved mechanical properties of several polymers by addition of nanoclays (Avella et al, 2005;Chen & Evans, 2005;Cyras, Manfredi, Ton-That, & Váz-quez, 2008;Jawahar & Balasubramanian, 2006;Mangiacapra et al, 2006;Russo, Nicolais, Di Maio, Montesano, & Incarnato, 2007;Yu, Lin, Yeh, & Lin, 2003).…”

Section: Applications Of Clay Nanocompositesmentioning

confidence: 94%

Nanocomposites for food packaging applications

Azeredo

2009

Food Research International

1,019

512

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a b s t r a c tMost materials currently used for food packaging are non-degradable, generating environmental problems. Several biopolymers have been exploited to develop materials for eco-friendly food packaging. However, the use of biopolymers has been limited because of their usually poor mechanical and barrier properties, which may be improved by adding reinforcing compounds (fillers), forming composites. Most reinforced materials present poor matrix-filler interactions, which tend to improve with decreasing filler dimensions. The use of fillers with at least one nanoscale dimension (nanoparticles) produces nanocomposites. Nanoparticles have proportionally larger surface area than their microscale counterparts, which favors the filler-matrix interactions and the performance of the resulting material. Besides nanoreinforcements, nanoparticles can have other functions when added to a polymer, such as antimicrobial activity, enzyme immobilization, biosensing, etc. The main kinds of nanoparticles which have been studied for use in food packaging systems are overviewed, as well as their effects and applications.

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“…A literature review shows that different polymer matrices for the reprocessing of nanocomposites have been studied such as polyethylene [13,14], polyamide [15][16][17][18], poly(ethylene vinyl acetate) [19] and acrylonitrile butadiene styrene [20]. These studies indicate the possibility for material reprocessing in order to enhance their properties.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Multiple Extrusions on the Properties of Montmorillonite Filled Polypropylene

et al. 2014

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Nanocomposites have attracted a great deal of interest during recent years. Much research has been conducted towards the incorporation of clay particles in a polypropylene matrix. However, the effect of extrusion reprocessing on the material properties has not been studied in depth. In this study, composites of polypropylene (PP) reinforced with organic modified montmorillonite (MMT) (4 wt%) and coupling agent were subjected to 15 extrusion cycles. The materials were characterized by melt flow index (MFI), plate-plate rheometry, tensile testing and impact measurements, differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed an improved intercalation of the MMT clay in the first few extrusions, thus improving the mechanical properties. Increasing the processing steps furthermore lead to a decrease in elastic modulus and impact strength, which was attributed to a reduction in matrix-filler interaction, most probably caused by organoclay degradation as shown by thermogravimetric analysis (TGA). The results of this study provide a useful insight in either the recycling of PP/MMT waste streams or the use of clay particles as a strengthening filler agent in the recycling process of different polymer waste streams.

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Rheological and mechanical properties of nylon 6 nanocomposites submitted to reprocessing with single and twin screw extruders

Cited by 52 publications

References 28 publications

Processing – morphology – property relationships of polyamide 6/polyethylene blend–clay nanocomposites

Processing – morphology – property relationships of polyamide 6/polyethylene blend–clay nanocomposites

Nanocomposites for food packaging applications

The Effect of Multiple Extrusions on the Properties of Montmorillonite Filled Polypropylene

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