Polyethylene fibers properties

Poly(ethylene-co-propylene), 24 703 Polyethylene fabrics, flashspun high density, 17 466 Polyethylene fibers, 26 761 high performance, 13 382 Polyethylene film, properties of,... 

In several cases the formation of a special morphology imparts mechanical properties to "simple" macromolecules which hitherto have only be obtained with "exotic" polymers (e.g. high strength polyethylene fibers). 

Polyethylene terephthalate modification hexsaazocyclanes by additives was carried out and fibers were formed. Additives introduction did not influence on the process of formation, and, consequently on the polymer fiber properties. 

High performance polymer fibers (HPPF) have excellent mechanical properties compared to traditional textile fibers such as nylon. The typical HPPFs are aramid and polyethylene fibers (6). Aramid is a generic name for a class of aromatic polyamide fibers, most of which are varieties of poly(p-pheny-lene terephthalamide). Kevlar is the trade name of the varieties of aramid polymers introduced conunercially by Dupont. The molecules in the fibers of these materials are oriented in the axial direction. Poly(p-phenylene terephthalamide) is a rigid molecule with the following structure ... 

Table VI compares the key properties of these two types of thermotropic polymers category by category. The samples compared had the same melting ranges, but were very different in reduced viscosities and solubility characteristics. The data compared were those processed under the most favorable conditions. Interestingly enough, the as-spun fibers from the polyester-carbonate can be heat-treated more efficiently than those fibers (of same tenacity) spun from the polyester. Both of them gave fiber properties far superior to those of nylons and polyethylene terephthalate. These two classes of polymers also had comparative properties (such as tensile strength, tensile modulus, flex modulus, notched Izod impact strength) as plastics and their properties were far superior to most plastics without any reinforcement.

Polyethylene fibers can be functionalized by chromium trioxide and ozone oxidation to generate carboxylic acid groups [148]. Surface properties may be modified by derivatization with a polar carbohydrate or PEG spacer for direct biomolecular solid-phase assays (see Fig. 10). 

Y. Ohama, M. Miyara and M. Endo Properties of steel fiber and polyethylene fiber hybrid reinforced polymer-modified concrete, in Proceedings of the 28th Japan Congress on Materials Research, The Society of Materials Science, Japan, Kyoto (1985), pp.151-155. 

Typical examples of the mixed emulsion-spinning of polyvinyl chloride, polyethylene, poly-vinylidene chloride, and polyvinyl acetate, and some properties of the mixed fibers are shown in Table 4.26. The measurement of the fiber properties is carried out after hot-drawing in dry air at 180°C, heat treatment for 100 sec at 250°C, and acetalization for 40 min at 70°C without tension. The draw ratios shown in the table are the highest possible ratios under the given experimental conditions. In most cases, there is a maximum possible draw ratio at a certain mixing ratio. However, only the results of experiments at mixing ratios of 1 3 and 1 1 are shown in the table. 

Polyblending of cellulose and polyethylene fibers (Morgan, 1961). The resultant paper, which comprises long, soft polyethylene fibers intertwined with the traditional cellulose, can be heat-sealed to a substrate (such as a steel can), and has improved properties, particularly wet strength. Alternatively, a sandwich of polyethylene fibers layered between two cellulose mats may be used such a paper exhibits considerable water resistance. 

Fu Y, Chen W, Pyda M, Londono D, Annis B, Boiler A, Habenschuss A, Cheng J, Wunderlich B (1996) Structure-property Analysis for Gel-spun Ultra-high Molecular-mass Polyethylene Fibers. J Macromol Sci, Phys B35 37-87. 

Ultra-high molecular weight polyethylene fibers depend on the particular properties of polyethylene. Polyethylene is a polymer consisting of long chains, as shown in Fig. 10.4. It has the simplest chemical stmcture among polymers. 

To this field, the so-called multicomponent PP/PE (polyethylene) fibers can be added. They are used as cigarette filters, but showing specific properties they can also be used for the filtration of gaseous media. 

The preparation of conducting polymers as fibers and films is described in Ref. 129, where polyethylene of low density is used as a matrix. A Ti(OBu)4-AlEt3 catalytic system in mineral oil was prepared and polyethylene fibers were impregnated by the catalyst with subsequent polymerization of acetylene. The PE/PA fibers contain up to 82% PA. Doping of these fibers with for 40 min resulted in an increase of conductivity up to 12(X) S/cm, and the conductivity of PE/PA fibers stretched 2.2 times became 60(X) S/cm after doping. The fibers obtained in this way were shown to have good mechanical properties even with small amounts of the polymer carrier to keep high electrical conductivity. 

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