A study of the crystallinity index of polypropylene fibres

Huda, Muhammad N.; Dragaun, H.; Bauer, S. H.; Muschik, H.; Skalický, P.

doi:10.1007/bf01422855

Cited by 32 publications

(4 citation statements)

References 37 publications

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“…The samples were allowed approximately 6 h to seek their level of displacement in the column. From the density the according mass crystallinity index X c was calculated as a percentage using the following equation: , where ρ represents the measured density of the tape, ρ c = 938 kg/m 3 is the density of 100% crystallinity, and ρ a = 854 kg/m 3 is the density of amorphous isotactic polypropylene…”

Section: Methodsmentioning

confidence: 99%

Influence of Postdrawing Temperature on Mechanical Properties of Melt-Spun Isotactic Polypropylene

et al. 2004

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Mechanical properties of melt-spun and postdrawn isotactic polypropylene (iPP) are studied to examine the dependence on the temperature in the postdrawing stage. In accordance with the literature, the Young's modulus is uniquely determined by the applied draw ratio. However, in contrast to the literature, we found that the overall mechanical behavior strongly depends on the applied postdrawing temperature. For a fixed draw ratio, a significant drop in yield stress can be observed with decreasing drawing temperature. At a certain drawing temperature, this drop leads to a transition from brittle to ductile failure behavior. From this study it can be concluded that a proper choice of drawing conditions offers control on several mechanical properties (e.g., stiffness, strength) at the same time.

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Section: Methodsmentioning

confidence: 99%

Influence of Postdrawing Temperature on Mechanical Properties of Melt-Spun Isotactic Polypropylene

et al. 2004

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“…The increase of the invariant may be explained by the formation of micropores in the fibres. Micropores in drawn polypropylene fibres which did not contain foreign particles were observed by Nurul Huda & co-workers (Nurul Huda, Bauer, Dragaun & Skalicky, 1984;Nurul Huda, Dragaun, Bauer, Muschlik & Skalicky, 1985). The probability of micropore formation is higher when fibres are drawn in the presence of pigments.…”

Section: Invariantmentioning

confidence: 78%

SAXS investigations of isotactic polypropylene (IPP) fibres mass coloured with organic pigments

Włochowicz¹,

Broda²

1991

J Appl Cryst

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The effect of selected organic pigments on the supermolecular structure of isotactic polypropylene (IPP) fibre has been investigated. For the present work, three organic pigments of different molecular and supermolecular constitution were selected. Undrawn fibres with a minimal technological degree of drawing and fibres at draw ratios of 2, 4 and 5 were examined. The supermolecular structure was explored using small‐angle X‐ray scattering (SAXS). From the SAXS patterns the one‐dimensional intensity function and the correlation function were determined. The parameters characterizing the supermolecular structure of the fibre, i.e. long period and invariant, were assessed. It was found that a lamellar structure develops during fibre formation. A regular lamellar structure is formed irrespective of the presence of pigments. On drawing fibres the high regularity of the lamellar structure decreases. In the drawing process the pigments are at the origin of micropore formation.

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“…And the integrated area also decreased with increasing the organoclay content, which indicated that the crystallinity of nanocomposite fibers was improved. The specific crystallinity of the pure PP and nanocomposite fibers was calculated based on the following formula,34 where I c and I a are the integrated areas of the crystalline and amorphous domains, respectively, and X c is the average crystallinity of the system. The data shown in Table II shows that the crystallinity of the drawn fibers increases with increasing the organoclay content and is higher than that of the pure PP fiber, which suggests again that certain organoclay added to the PP fibers could act as the nucleating agent and promote the crystal growth of the PP crystal in an essential way and perfected the α‐crystalline form.…”

Section: Resultsmentioning

confidence: 99%

Investigation on the melt spinning fibers of PP/organoclay nanocomposites prepared by in‐situ polymerization

Hao¹,

Zhao²,

He³

et al. 2010

J of Applied Polymer Sci

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Fibers prepared by melt spinning process from the PP (polypropylene)/organoclay nanocomposite were characterized in details with the aid of SEM, FTIR, XRD, DSC, and mechanical measurements. The results suggested that the lower content of organoclay (0.1%) added to the PP matrix increased the crystallinity and mechanical property (tensile strength) of the PP/organoclay nanocomposite fiber. With increasing the content of organoclay (! 0.3%), the crystallinity and the tensile strength both a little decreased, and the fiber containing organoclay exhibited multi-peaks at the same draw ratio during the heating process. Furthermore, the degree of orientation of the fiber increased a little with lower content of organoclay (0.1%) introduction to PP during the infrared dichroism measurement.

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A study of the crystallinity index of polypropylene fibres

Cited by 32 publications

References 37 publications

Influence of Postdrawing Temperature on Mechanical Properties of Melt-Spun Isotactic Polypropylene

Influence of Postdrawing Temperature on Mechanical Properties of Melt-Spun Isotactic Polypropylene

SAXS investigations of isotactic polypropylene (IPP) fibres mass coloured with organic pigments

Investigation on the melt spinning fibers of PP/organoclay nanocomposites prepared by in‐situ polymerization

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