Structure and tensile properties of Nanoclay–Polypropylene fibers produced by melt spinning

Rangasamy, Loganathan; Shim, Eunkyoung; Pourdeyhimi, Behnam

doi:10.1002/app.33619

Cited by 24 publications

(24 citation statements)

References 30 publications

(41 reference statements)

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“…At increasing nanoclay content, a considerable decrease in the intensity and a slight broadening and shift towards lower 2θ of the 110 reflection is observed while a lower influence was registered for the 200 reflection. According to the literature, the presence of an intercalated/exfoliated morphology, combined to the high interfacial area and adhesion between the polymer and the clay, hinders PE chain mobility, having two effects: a reduction of the crystallinity degree (related to the peak intensity) and dimension of the crystallites (related to the peak broadening and shift) [23,25,43]. Wide angle X-ray diffraction (WAXD) patterns report the presence of the typical crystalline structure of PE with two dominant peaks at 2θ angles of 21.6° and 23.9°, which correspond to the 110 plane and the 200 plane of an orthorhombic crystal structure (Figure 4), respectively.…”

Section: Mechanical Properties Of As-spun Fibersmentioning

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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Section: Mechanical Properties Of As-spun Fibersmentioning

confidence: 99%

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

et al. 2017

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“…Fibers of PP are employed in many end-use products thanks to their properties such as low density, resistance to moisture and chemicals, sufficient strength and easy processing [3]. 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].…”

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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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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“…Figure 1a evidences the presence of various agglomerates with dimensions in the range between 5 and 15 microns in the masterbatch containing 12 wt% of hydrotalcite. These agglomerates need to be properly disaggregated and dispersed in HDPE compounds during processing otherwise these defects and stress concentration points could prevent the drawability in fiber spinning [22]. ESEM analysis evidenced the progressive dispersion of LDH in polyethylene matrix.…”

Section: Results and Discussion 31 Compounding And Morphologymentioning

confidence: 99%

“…In particular, the organo-modified clay was considered responsible for the reduction of the fiber defects during drawing and for the higher attainable draw ratios [17]. On the other hand, various authors described the production of isotactic polypropylene fibers containing organo-modified clay with a double-step process consisting in a preliminary melt compounding with or without compatibilizer, followed by fiber spinning [19][20][21][22] or melt-spun bonding [23]. The fiber properties were found to be dependent on the polypropylene melt flow, ranging between 12 and 35 dg/min (230°C, 2.1 6kg), the nanoclay composition, and the spinning and drawing conditions.…”

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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Structure and tensile properties of Nanoclay–Polypropylene fibers produced by melt spinning

Cited by 24 publications

References 30 publications

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

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

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

Organically modified hydrotalcite for compounding and spinning of polyethylene nanocomposites

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