High performance polyethylene nanocomposite fibers

D’Amato, Marianna; Dorigato, Andrea; Fambri, Luca; Pegoretti, Alessandro

doi:10.3144/expresspolymlett.2012.101

Cited by 35 publications

(41 citation statements)

References 42 publications

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“…PP fiber's properties can be enhanced by melt mixing with nanosized particles like carbon nanotubes [4][5][6] and montmorillonite [7,8]. Nowadays, many reports have been focused on the addition of silica and/or fumed nanosilica (FS) to enhance mechanical properties of polyolefins [9][10][11][12][13], PP fibers [12][13][14] and synthetic rubbers [15]. Synthetic amorphous silicon dioxide is manufactured via the hydrolysis of chlorosilanes in an oxygen-hydrogen gas flame.…”

Section: Introductionmentioning

confidence: 99%

“…They observed not only a higher thermal stability and nucleation effect of the nanofiller, but also a remarkable increase in the tensile strength, as consequence of the incorporation of elongated and flattened silica particles during the spinning process. D'Amato et al [9] used high density polyethylene with low melt flow index as a matrix to produce fibers by means of a two-step process: extrusion and drawing. Fiber stiffness was remarkably improved by nanofiller presence, especially at elevated draw ratios, without affecting the tensile properties at break.…”

Section: Introductionmentioning

confidence: 99%

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Spinning, drawing and physical properties of polypropylene nanocomposite fibers with fumed nanosilica

Dabrowska¹,

Fambri²,

Pegoretti³

et al. 2015

Express Polym. Lett.

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Abstract. Nanocomposite fibers of isotactic polypropylene -fumed silica AR805 were prepared by melt compounding using a two-step process: melt-spinning and hot drawing at various draw ratios up to 15. Transmission electron microscopy revealed uniform dispersion of the silica nanoparticles in polypropylene matrix, although at higher concentrations and lower draw ratios the nanoparticles showed increasing tendency to form small agglomerates. On the other hand, at low concentrations the uniform distribution of fumed silica improved mechanical properties of the composite fibers, especially at higher draw ratios. Crystallinity and melting temperature of fibers were found to significantly increase after drawing. Elastic modulus at draw ratio = 10 rose from 5.3 GPa for neat PP up to 6.2-8.1 GPa for compositions in the range 0.25-2 vol% of the filler. Moreover, higher tensile strength and creep resistance were achieved, while strain at break was rather insensitive to the filler fraction. Considering all experimental results, a failure model was proposed to explain the toughness improvement during the drawing process by the induced orientation of polymer chains and the formation of voids.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spinning, drawing and physical properties of polypropylene nanocomposite fibers with fumed nanosilica

Dabrowska¹,

Fambri²,

Pegoretti³

et al. 2015

Express Polym. Lett.

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“…Among them, organomodified layered clays resulted particularly attractive from a technological point of view for the production of polymeric nanocomposites with unique multifunctional properties. In fact, they are widespread available and cheap, can be delaminated into nanometric clay layers with high aspect-ratio into several matrices and provide the possibility of producing nanocomposite systems with tailored and balanced strength/stiffness/toughness and improved dimensional and thermal stability, fire retardancy and gas barrier characteristics, without detrimental effects on recyclability [4][5][6][7][8][9][10][11][12][13][14][15][16]. In addition, nanoparticles can be also used as synthetic fibers coating, in order to improve mechanical properties of interfaces in composite materials [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Morphology Development and Mechanical Properties Variation during Cold-Drawing of Polyethylene-Clay Nanocomposite Fibers

et al. 2017

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Abstract:In this work, the influence of composition and cold-drawing on nano-and micro-scale morphology and tensile mechanical properties of PE/organoclay nanocomposite fibers was investigated. Nanocomposites were prepared by melt compounding in a twin-screw extruder, using a maleic anhydride grafted linear low density polyethylene (LLDPE-g-MA) and an organomodified montmorillonite (Dellite 67G) at three different loadings (3, 5 and 10 wt %). Fibers were produced by a single-screw extruder and drawn at five draw ratios (DRs): 7.25, 10, 13.5, 16 and 19. All nanocomposites, characterized by XRD, SEM, TEM, and FT-IR techniques, showed an intercalated/exfoliated morphology. The study evidenced that the nanoclay presence significantly increases both elastic modulus (up to +115% for fibers containing 10 wt % of D67G) and drawability of as-spun nanocomposite fibers. Moreover, at fixed nanocomposite composition, the cold-drawing process increases fibers elastic modulus and tensile strength at increasing DRs. However, at high DRs, "face-to-edge" rearrangement phenomena of clay layers (i.e., clay layers tend to rotate and touch each other) arise in fibers at high nanoclay loadings. Finally, nanocomposite fibers show a lower diameter reduction during drawing, with respect to the plain system, and surface feature of adjustable roughness by controlling the composition and the drawing conditions.

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“…Together with improvement in modulus, a slightly lower stress at break was observed, whereas strain at break exhibit higher values in comparison to neat HDPE drawn fiber ( Figure 8 and Table 6). In general, the enhancement of mechanical stiffening observed for nanocomposites can be explained as an effect of the alignment of nanofiller particles along the strain direction [18]. This process is very similar to the exfoliation process induced by the flow in polymer/clay nanocomposites with a good affinity between the two components.…”

Section: Mechanical Properties Of Plates and Fibersmentioning

confidence: 89%

“…However, it should be noted that even in the case of low molecular weight polymers, the presence of nanofiller and sometimes the lower level of chain extension determine the formation of various type of defects, and hence relatively low modulus and strength values of the spun fibers. In the case of polyethylene fibers, both linear low density and high density polymers at very low melt flow, between 0.27 and 0.9 dg/min (190°C, 2.16 kg), were spun with various organo-modified clays or with fumed silica [14][15][16][17][18]. The high molecular weight of polymers allowed an efficient drawing process and the achievement of higher mechanical properties of drawn nanocomposite fiber with respect to those of neat polymer.…”

Section: Introductionmentioning

confidence: 99%

Organically modified hydrotalcite for compounding and spinning of polyethylene nanocomposites

Dabrowska¹,

Fambri²,

Pegoretti³

et al. 2013

Express Polym. Lett.

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Abstract.Organically modified hydrotalcite is a recent class of organoclay based on layered double hydroxides (LDH), which is anionically modified with environmental friendly ligands such as fatty acids. In this paper the influence of hydrotalcite compounded/dispersed by means of two different processes for production of plates and fibers of polyolefin nanocomposites will be compared. A polyethylene matrix, suitable for fiber production, was firstly compounded with various amounts of hydrotalcite in the range of 0.5-5% by weight, and then compression moulded in plates whose thermomechanical properties were evaluated. Similar compositions were processed by using a co-rotating twin screw extruder in order to directly produce melt-spun fibers. The incorporation of clay into both bulk and fiber nanocomposites enhanced the thermal stability and induced heterogeneous nucleation of polyethylene crystals. Hydrotalcite manifested a satisfactory dispersion into the polymer matrix, and hence positively affected the mechanical properties in term of an increase of both Young's modulus and tensile strength. Tenacity of nanocomposite as spun fibers was increased up to 30% with respect to the neat polymer. Moreover, the addition of LDH filler induced an increase of the tensile modulus of drawn fibers from 5.0 GPa (neat HDPE) up to 5.6-5.8 GPa.

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High performance polyethylene nanocomposite fibers

Cited by 35 publications

References 42 publications

Spinning, drawing and physical properties of polypropylene nanocomposite fibers with fumed nanosilica

Spinning, drawing and physical properties of polypropylene nanocomposite fibers with fumed nanosilica

Morphology Development and Mechanical Properties Variation during Cold-Drawing of Polyethylene-Clay Nanocomposite Fibers

Organically modified hydrotalcite for compounding and spinning of polyethylene nanocomposites

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