Results 261 to 270 of about 80,685 (307)
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1999
Special types of polypropylene (PP) fibers were developed in order to widen their application. The special fibers may be ranged into the following main groups: • multicomponent fibers containing at least two different polymers; • fibers with changing cross-section geometry (profiled and partly filled); • bioactive fibers.
Martin Jambrich, Anton Marcinčin
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Special types of polypropylene (PP) fibers were developed in order to widen their application. The special fibers may be ranged into the following main groups: • multicomponent fibers containing at least two different polymers; • fibers with changing cross-section geometry (profiled and partly filled); • bioactive fibers.
Martin Jambrich, Anton Marcinčin
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The crystallization of polypropylene/halloysite fibers
Journal of Thermal Analysis and Calorimetry, 2018The halloysite (HNT) in the form of nanotubes was used as an agent for the improved mechanical, thermo-mechanical as well as surface properties of polypropylene (PP) fibers. The halloysite is the nanoadditive that can affect differently the crystallization of PP in the non-oriented and oriented systems. The structure and mechanical properties of PP and
Mária Petková +4 more
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The Coloration of Polypropylene Fibers
1987Polypropylene, as produced, does not possess properties normally attributed to a fiber-forming polymer. Despite a relatively low melting point, it is not stable below melt temperatures and will degrade in UV light at room temperature, unless stabilizers are added.
Marvin Wishman +2 more
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Time‐Dependent Properties of Isotactic Polypropylene Fibers
Annals of the New York Academy of Sciences, 1999Many physical properties of polymers exhibit appreciable changes with the time. Some of these changes are due to the phenomenon reported as “physical aging.” Physical aging of polymers, depending only on time, occurs in amorphous polymers stored at a temperature below the glass transition temperature (Tg): when the system is rapidly cooled through Tg ...
G. BARRA +3 more
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Pulmonary Toxicity of Inhaled Polypropylene Fibers in Rats
Toxicological Sciences, 1992This study was initiated to assess the pulmonary toxicity of a polyolefin fiber composed of polypropylene in male Fischer 344 rats after 90 days of inhalation exposure. To increase fiber respirability in the rodent, polypropylene fibers were size-selected before aerosolization to have a geometric mean diameter of 1.6 microns (46% < 1 micron) and a ...
T W, Hesterberg +4 more
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Melt Spinning of Polypropylene Fiber
Advance Research in Textile Engineering, 2023In this paper the melt spinning process and technology of polypropylene fiber, polymerization conditions, preparation of polypropylene fiber by a larger variety of processes and the stress in the spinline was presented. More emphasis was given on the various polymerization processes (gas-phase and liquid-phase polymerization), catalyst system ...
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Dyeing of polypropylene fibers
1999Polypropylene (PP) fibers having a nonpolar paraffinic character are generally undyeable by the classical bath-dyeing method and therefore the substantial part of the PP fiber production is colored with pigments (mass dyed fibers). Only a small part of PP fibers is dyed after preliminary modification.
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Polypropylene + boehmite nanocomposite fibers
Journal of Polymer Engineering, 2012Abstract The influence of nanosized filler particles on mechanical properties of composite fibers has some specific features related to the fiber matrix, its preparation and the filler content, as well as the orientation of the fibers at their drawing.
Lubica Škovranová +7 more
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Textile applications of polypropylene fibers
1999Polypropylene (PP) fibers belong to the youngest generation of large-scale produced chemical fibers. Their production is the second largest after polyethylene terephthalate (PET) [1].
Martin Jambrich, Pavol Hodul
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