Polypropylene Fibers and Films

Galanti, Anthony V.; Mantell, C. L.

doi:10.1007/978-1-4899-2822-1

Cited by 17 publications

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“…Hence, the increase of orientation was alone responsible for the higher moduli of the 1400 and 1880 m/min fibers. Drawing has been shown to decrease crystallinity 20. Galanti and Mantell20 showed that amorphous structures orient more rapidly than crystalline structures in fibers because amorphous structures have a greater mobility than crystallites.…”

Section: Resultsmentioning

confidence: 99%

The influence of processing parameters on the properties of melt‐spun polypropylene hollow fibers

Rovère

Grady

Shambaugh

2001

J of Applied Polymer Sci

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Isotactic polypropylene hollow fibers were produced by melt spinning. Spinning speeds up to 1880 m/min were used, and sample hollowness (percentage void in cross section) ranged from 0 to 69%. The fiber samples were characterized using dynamic mechanical analysis, birefringence, tensile testing, and differential scanning calorimetry. The hollow fibers were found to have higher crystallinity, orientation, and strength than the analogous solid fibers. In general, the polymer orientation in a hollow fiber was larger than the orientation in a solid fiber, even when the spinning speed for the latter was much larger. For a fixed outer diameter, increasing the hollowness improved fiber properties. However, as hollowness was further increased, fiber properties declined slightly. At a given percentage hollowness, increased spinning speed increased modulus and tenacity.

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Section: Resultsmentioning

confidence: 99%

The influence of processing parameters on the properties of melt‐spun polypropylene hollow fibers

Rovère

Grady

Shambaugh

2001

J of Applied Polymer Sci

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“…Three characteristic peaks of diffracting angles (2θ) for 14.0, 16.8, and 18.5°, corresponding to reflection planes of (110), (040), and (130) in equator direction, did not clearly shift as expected for the diffraction intensities. These peaks revealed the α form of isotactic PP (monoclinic structure) 41–52. The Δ n values of the ZN‐iPP/m‐iPP polyblended fibers initially increased and then declined as the m‐iPP content increased.…”

Section: Resultsmentioning

confidence: 99%

Thermal characteristics and crystallinity of Ziegler–Natta isotactic polypropylene/metallocene isotactic polypropylene polyblended fibers

Shu

Hsiao

Tsen

2009

J of Applied Polymer Sci

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Ziegler-Natta isotactic polypropylene (ZNiPP) and metallocene isotactic polypropylene (m-iPP) were extruded (in ratios of 75/25, 50/50, and 25/75) from one melt twin-screw extruder to produce three ZN-iPP/ m-iPP polyblended polymers and, subsequently, spin fibers. In this study, we examined the rheology of the ZNiPP/m-iPP polyblended polymers and the thermal characteristics and crystallinity of the ZN-iPP/m-iPP polyblended fibers using gel permeation chromatography, rheometry, differential scanning calorimetry (DSC), wideangle X-ray diffraction, density gradient analysis, and extension stress-strain measurement. The apparent melt viscosity of the ZN-iPP/m-iPP polyblended polymers revealed positive-deviation blends. The 50/50 blend of ZN-iPP/m-iPP had the highest apparent melt viscosity. For five samples, the complex melt viscosity decreased with the angular frequency, which represented typical non-Newtonian behavior. The Cole-Cole plot, which consisted of the imaginary part of the complex melt viscosity versus the real part of the complex melt viscosity plot, of the ZN-iPP/m-iPP polyblended polymers showed a semicircular relationship with the blend ratios. It indicated that the ZN-iPP/m-iPP polyblended polymers were miscible. We analyzed the shear modulus data (G 0 vs G 00 ) by plotting them on a log-log scale. The plot revealed almost the same slopes for the ZN-iPP/m-iPP polyblended polymers, which indicated a good miscibility between the ZNiPP and m-iPP polymers. The experimental DSC results demonstrate that the ZN-iPP and m-iPP polymers constituted a miscible system. The crystallinity and tenacity of the ZN-iPP/m-iPP polyblended fibers initially increased and then fell as the m-iPP content increased. Meanwhile, the 50/50 blend of ZN-iPP/m-iPP had the highest crystallinity and tenacity.

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“…Polypropylene (PP) is a thermoplastic polymer that was first produced in 1957 by Gulio Natta in Italy [1]. PP is a very versatile polymer material, which exhibits low density (0.89 gm/cc) and superior rigidity amongst various polymers.…”

Section: Introductionmentioning

confidence: 99%

“…Films are either tubular quenched or biaxially oriented and are mainly used for packing food products, textiles, garments, etc. Injection molded products, especially in automotive, electronics and office automation, furniture and domestic appliances are very popular [1]. In the textile sector, PP monofilament yarns and staple fibers are used for carpet, carpet backing, upholstery, apparels, filter cloth, disposable diapers, and automotive interiors.…”

Section: Introductionmentioning

confidence: 99%

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The effect of temperature and drawing ratio on the mechanical properties of polypropylene monofilaments

Taheri

Nóbrega

Samyn

et al. 2014

AIP Conference Proceedings

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Thermal and mechanical properties of polylactic acid (PLA) and bagasse carboxymethyl cellulose (CMC B ) composite by adding isosorbide diesters AIP Conference Proceedings 1664, 060006 (2015) AbstractIn this work, the simultaneous effect of both temperature and drawing ratio during processing of polypropylene monofilaments has been investigated. The basis of this work specifically aims at emphasizing the conditions of temperature and drawing ratio applied in the cooling bath, in order to find out under which conditions the named parameters can be applied in a processing line under continuous extrusion. The effects of temperature are studied for a constant total drawing ratio to analyze the influences on mechanical properties and structural differences of the final polypropylene monofilament. The quenched monofilaments were drawn around an adjustable guide assembly in the quench bath and first drawing stage, imparting thermal and mechanical treatments to the filaments. In the heating stage, monofilaments are affected to high-speed draw rolls while passing through the oven. As such, the best conditions to produce a polypropylene monofilament with high tenacity strength were determined. Results of this study show that the monofilament properties are significantly affected by temperature in the cooling zone. The nature of the first drawing had a significant effect on the end properties and monofilaments with modulus of 637 MPa have finally been manufactured. We have also proposed a new hypothesis, which is termed "gap nucleation" and determine this phenomenon in the gap between die and cooling bath.

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Polypropylene Fibers and Films

Cited by 17 publications

References 0 publications

The influence of processing parameters on the properties of melt‐spun polypropylene hollow fibers

The influence of processing parameters on the properties of melt‐spun polypropylene hollow fibers

Thermal characteristics and crystallinity of Ziegler–Natta isotactic polypropylene/metallocene isotactic polypropylene polyblended fibers

The effect of temperature and drawing ratio on the mechanical properties of polypropylene monofilaments

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