Preparation of polypropylene/nanoclay composite fibers

Guo, Zengwei; Hagström, Bengt

doi:10.1002/pen.23463

Cited by 10 publications

(12 citation statements)

References 32 publications

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“…Moreover, since the chemical composition can be precisely controlled, these materials can find applications where the chemical purity is required, for example in food, medical, and microelectronic industries . In general, LDH has a layered structure similar to silica clays, but the layers positively charged with an anionic interlayer gallery can be exchanged by bulk organic anions; when the interlayer distance is increased, polymer chains can intercalate into the gallery and thus nanocomposites with an intercalated and/or exfoliated morphology can be obtained …”

Section: Introductionmentioning

confidence: 99%

“…[20][21][22][23][24] Recently many articles on synthetic layered double hydrotalcite (LDH) have been published. [26][27][28][29][30][31][32][33][34] LDH is a synthetic clay produced in a broad range of chemical compositions. Moreover, since the chemical composition can be precisely controlled, these materials can find applications where the chemical purity is required, for example in food, medical, and microelectronic industries.…”

Section: Introductionmentioning

confidence: 99%

“…33 In general, LDH has a layered structure similar to silica clays, but the layers positively charged with an anionic interlayer gallery can be exchanged by bulk organic anions; when the interlayer distance is increased, polymer chains can intercalate into the gallery and thus nanocomposites with an intercalated and/or exfoliated morphology can be obtained. 26,27,29,34 Commercially available grades are based on magnesium aluminum hydroxides. In this article we have used organically modified hydrotalcite characterized by the enlarged interlayer distance of the pristine clay, increased hydrophobic nature and decreased interaction between platelets to facilitate dispersion.…”

Section: Introductionmentioning

confidence: 99%

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Melt spinning and drawing of polyethylene nanocomposite fibers with organically modified hydrotalcite

Fambri

Dabrowska

Pegoretti

et al. 2013

J of Applied Polymer Sci

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Fibers of high density polyethylene (HDPE)/organically modified hydrotalcite (LDH) were produced by melt intercalation in a two‐step process consisting of twin‐screw extrusion and hot drawing. The optimum drawing temperature was 125°C at which the draw ratios up to 20 could be achieved. XRD analysis revealed intercalation with a high degree of exfoliation for the composites with 1–2% of LDH. Higher thermal stability of nanofilled fibers was confirmed by TGA analysis. DSC data indicated that dispersed LDH particles act as a nucleating agent. Crystallization kinetics of the HDPE matrix in the composite fibers is characterized by two transition temperatures, that is, for Regimes I/II at 123°C and for Regimes II/III ranging between 114–119°C as a function of the nanocomposite composition. Fibers with 1–2% of LDH show for the drawing ratios up to 15 a higher elastic modulus, 9.0–9.3 GPa (with respect to 8.0 GPa of the neat HDPE), maintain tensile strength of 0.8 GPa and deformation at break of 20–25%. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40277.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Melt spinning and drawing of polyethylene nanocomposite fibers with organically modified hydrotalcite

Fambri

Dabrowska

Pegoretti

et al. 2013

J of Applied Polymer Sci

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“…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. Recently, the preparation of polypropylene-nanoclay composite fibers starting from hydrotalcite has been described by Guo and Hagstrom [24]. The present work details the formulation of hydrotalcite/polyethylene composite and the production of melt spun fiber.…”

Section: Introductionmentioning

confidence: 95%

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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“…Take injection-moulded parts as an example: a very small amount of shish-kebabs can be in situ developed in the nal injectionmoulded parts, and moreover they are only located in an extremely thin layer close to the surface due to the intense shear and fast solidication therein. Due to the extraordinary mechanical properties, a wide range of inorganic llers including clay, [21][22][23][24] calcium carbonate, 25,26 carbon nanotubes, 27,28 etc., have been utilized to prepare reinforced composites. 20 To date, studies on semi-crystalline polymer-based (e.g., polyethylene and polypropylene) composites have indicated that reinforced llers are roughly classied into two categories: inorganic and organic ones.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a polymer/aligned shish-kebab composite: microstructure and mechanical properties

et al. 2015

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A shear-induced ultrahigh molecular weight polyethylene (UHMWPE) shish-kebab mat (USKM), in which shish-kebabs are well aligned, has been achieved from a dilute UHMWPE solution. Such a USKM is incorporated into linear low density polyethylene (LLDPE) as a reinforcement filler. Isothermal crystallization shows that the USKM acts as an effective nucleating agent for LLDPE crystallization, leading to enhanced crystallinity, long period, and lamellar thickness of the USKM/LLDPE composite.Instead of shish-kebabs, only aligned fibrils are observed in the composite. Such fibrils consist of a shish structure wrapped with LLDPE chains and good bonding at the interface between the fibril and matrix is achieved. Consequently, the interfacial adhesion is expected to improve and favorable stress transfer is realized. Together with good bonding, the superior strength of the shish structure and the above enhanced crystalline parameters contribute to a significant increment in the tensile strength and modulus of the composite, as compared to pure LLDPE. ; Tel: +86 371 63887600 † Electronic supplementary information (ESI) available. See Fig. 8 (a) The calculation method of the long period (L) and lamellar thickness (L c ) obtained from the one-dimensional correlation function K(z); (b) the curves of the one-dimensional electron density correlation function of the pure LLDPE and the USKM/LLDPE composite. Fig. 9 SEM images of the etched surface of the USKM/LLDPE composite. The white arrow refers to the flow direction of the USKM.This journal is

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Preparation of polypropylene/nanoclay composite fibers

Cited by 10 publications

References 32 publications

Melt spinning and drawing of polyethylene nanocomposite fibers with organically modified hydrotalcite

Melt spinning and drawing of polyethylene nanocomposite fibers with organically modified hydrotalcite

Organically modified hydrotalcite for compounding and spinning of polyethylene nanocomposites

Fabrication of a polymer/aligned shish-kebab composite: microstructure and mechanical properties

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