Results 261 to 270 of about 28,551 (308)

Modification of Polypropylene Fibers by Plasma and Preparation of Hybrid Luminescent and Rodlike CdS Nanocrystals/Polypropylene Fibers

Journal of Nanoscience and Nanotechnology, 2006
A simple method for the preparation of hybrid luminescence and rodlike CdS nanoclusters/poly (propylene-grafted-(2-methylacrylic acid 3-(bis-carboxymethyl amino-2-hydroxy-propyl ester) (GMA-IDA fibers, by plasma induced method following chemical deposition method, is presented in this study.
Chun-Hao, Tseng, Cheng-Chien, Wang, Chuh-Yung, Chen   +2 more
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Polymorphism in polypropylene fibers

Journal of Applied Polymer Science, 2003
AbstractThe 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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The Role of Polypropylene Fibers and Polypropylene Geotextile in Erosion Control

IACGE 2013, 2013
The geotextile industry research and development is growing at a fast rate and new products of variable specifications are now available for earthworks and design engineers. The nature of the material as a filter and the engineering properties of the materials used made it possible to explore a wide range of application.
Muawia Dafalla, Ali Obaid
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Special polypropylene fibers

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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Time‐Dependent Properties of Isotactic Polypropylene Fibers

Annals of the New York Academy of Sciences, 1999
Many 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, D'ANIELLO, Concetta, R. RUSSO, VITTORIA, Vittoria   +3 more
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Pulmonary Toxicity of Inhaled Polypropylene Fibers in Rats

Toxicological Sciences, 1992
This 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, E E, McConnell, W C, Miller, R, Hamilton, W B, Bunn   +4 more
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The crystallization of polypropylene/halloysite fibers

Journal of Thermal Analysis and Calorimetry, 2018
The 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, Jozef Ryba, Veronika Hrabovská, Anna Ujhelyiová, Marcela Hricová   +4 more
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The Coloration of Polypropylene Fibers

1987
Polypropylene, 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, James Leininger, Deborah Fenton   +2 more
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Melt Spinning of Polypropylene Fiber

Advance Research in Textile Engineering, 2023
In 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

1999
Polypropylene (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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