Results 251 to 260 of about 67,820 (305)
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Failure of polypropylene fibers
Fibre Chemistry, 1984A quantitative definition of the highly elastic deformation built up in extension of polypropylene fiber has been proposed.
V. D. Fikhman +2 more
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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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Pectin Coated Hollow Fiber Polypropylene Membranes
The International Journal of Artificial Organs, 1997The aim of this study was to prepare a composite membrane for the selective, extracorporeal removal of human LDL-cholesterol. Pectin coated on a porous polypropylene membrane (PP) was used as an active LDL adsorber. Three types of membrane preparations were performed: coating of native PP, coating after chemical etching and γ-irradiated coated PP ...
D, Lewińska +2 more
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Polymorphism in polypropylene fibers
Journal of Applied Polymer Science, 2003AbstractThe structure of polypropylene fibers formed by different spinning conditions was studied. The investigations were carried out using wide‐angle X‐ray scattering (WAXS) and small‐angle X‐ray scattering (SAXS) methods. It was stated that in noncolored fibers the mesophase and the monoclinic α forms were formed.
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Fibers from polypropylene/nano carbon fiber composites
Polymer, 2002Fibers from polypropylene and polypropylene/vapor grown nano carbon fiber composite have been spun using conventional melt spinning equipment. At 5 wt% nano carbon fiber loading, modulus and compressive strength of polypropylene increased by 50 and 100%, respectively, and the nano carbon fibers exhibited good dispersion in the polypropylene matrix as ...
Satish Kumar +4 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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Textile polypropylene fibers: fundamentals
1999Polypropylene (PP) fibers contain, according to ISO 2076, minimally an 85% portion of macromolecular polypropylene chains and maximally 15% of another fiber-forming polymer, the content of nonfiber-forming substance being unlimited. Of the stereoregular isomers, only isotactic PP is used for fiber preparation.
Anton Marcinčin, Martin Jambrich
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Fiber reinforced rubber modified polypropylene
Polymer Engineering & Science, 1975AbstractReinforcement can improve the modulus, heat distortion temperature and thermal expansion coefficient of rubber modified polypropylene. These improvements canbe obtained with a minimum sacrifice in resin ductility and impact toughness. Our studies have shown that reinforcement with small discontinuous fibers can provide a material with a good ...
William M. Speri, George R. Patrick
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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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