High density polyethylene fibers

R.R Paradkar, S.S. Sakhalkar, X. He and M.S. Ellison, Estimating crystallinity in high density polyethylene fibers using online Raman spectroscopy, J. Appl. Polym. Sci., 88, 545-549 (2003). 

Paradkar, R.P. Sakhalkar, S.S. He, X. 8t Ellison, M.S. Estimating Crystallinity in High Density Polyethylene Fibers Using Online Raman Spectroscopy /. Appl. Polym. Sci. 2003, 88, 545-549. 

In order to improve the tensile properties of low-density polyethylene. Mead and Porter [100] added high density polyethylene fibers and film strips. This resulted in an increase in the extensional viscosity and consequently, the tensile modulus of the composite was increased by a factor of 10. The effect of different mineral fillers (e.g. talc, mica, clay, dolomite) on the rheological properties of low density polyethylene films was studied by Arina et al. [17]. It was found that the fillers increased the extensional viscosity of a polymer matrix in concurrence with the earlier observations of Han and Kim [86] as well as Mead and Porter [100]. 

MJ Citra, DB Chase, RM Ikeda, KH Gardner. Molecular orientation of high-density polyethylene fibers characterized by polarized Raman spectroscopy. Macromolecules 28 4007-4012, 1995. 

Gupta, V.B. and Rana, S.K. (1998) Double yield in tensile deformation of high-density polyethylene fiber. J. Macromolecular Sci. Phys., B37, 783. 

Tyvek, a polyolefin fibrous sheet material, is made from very fine, high density Polyethylene fibers. It offers a unique combination of the characteristics of paper, film and fabrics which makes it strong, tear and puncture resistant and yet light weight... 

HDPE, high density polyethylene PP, polypropylene EVA, ethylene—vinyl alcohol SMC, sheet-molding compound ERP, fiber-reinforced plastic LDPE, low density polyethylene PE, polyethylene BMC, bulk mol ding compound TPE, thermoplastic elastomer. 

The majority of spunbonded fabrics are based on isotactic polypropylene and polyester (Table 1). Small quantities are made from nylon-6,6 and a growing percentage from high density polyethylene. Table 3 illustrates the basic characteristics of fibers made from different base polymers. Although some interest has been seen in the use of linear low density polyethylene (LLDPE) as a base polymer, largely because of potential increases in the softness of the final fabric (9), economic factors continue to favor polypropylene (see OlefinPOLYMERS, POLYPROPYLENE). 

Fig. 19a, b. Curves of isometric heating a reference sample (curve 1) and sample obtained if molecular orientation exists and containing a spatial framework (curve 2) (schematic representation) b data for high density polyethylene (—A----------ordinary fiber, —O-------fiber obtained by... 

Fig. 20. Stress(er)-strain (ai) dependence for high density polyethylene samples. 1 reference sample, 2 sample obtained if molecular orientation exists, 3 super high tenacity fiber-fibril. Asterisks denote the points of fiber failure...

Short fiber reinforcement of TPEs has recently opened up a new era in the field of polymer technology. Vajrasthira et al. [22] studied the fiber-matrix interactions in short aramid fiber-reinforced thermoplastic polyurethane (TPU) composites. Campbell and Goettler [23] reported the reinforcement of TPE matrix by Santoweb fibers, whereas Akhtar et al. [24] reported the reinforcement of a TPE matrix by short silk fiber. The reinforcement of thermoplastic co-polyester and TPU by short aramid fiber was reported by Watson and Prances [25]. Roy and coworkers [26-28] studied the rheological, hysteresis, mechanical, and dynamic mechanical behavior of short carbon fiber-filled styrene-isoprene-styrene (SIS) block copolymers and TPEs derived from NR and high-density polyethylene (HOPE) blends. 

Morpholine chromate, molecular formula, properties, and uses, 6 562t Morphology. See also Structure of carbon fibers, 26 737-739 of high density polyethylene, 20 162 of polymer blends, 20 356 of polymer colloid, 20 386-388 of PVC particles, 25 658-661, 661-663, 664-665... 

Those are the generalities of polymers. The specifics of low- and high-density polyethylene, polypropylene, polyvinyl chloride, and polystyrene are covered in the next chapter and resins and fibers in the last. 

Figures 7.18(b) and 7.18(c) show the breakup into droplets of an extended filament of high density polyethylene in a polystyrene matrix. In Fig. 7.18(b) the distance between the extruder die and the quenching bath is short and the fiber freezes before breaking up, whereas in Fig. 7.18(c) the distance was increased, giving the filaments sufficient time for breakup. As the filament extends, its diameter is reduced until shear forces no longer dominate the surface tension cohesive forces and the filaments breaks into droplets, just like a stream of water from a faucet breaks up into droplets.

Although polyethylene was considered a source of useful fibers at an early date, its low melting point (110-120°C) as well as other limitations precluded active development during the period when production of other fibers based upon the petrochemical industry expanded enormously. The higher melting point of high-density polyethylene gave some promise, but it was overshadowed by the introduction of polypropylene (PP) around... 

Packaging and Storage Store liquid Grape Skin Extract with aseptic packaging or in high-density polyethylene containers at 4° to 14°. Store powdered Grape Skin Extract in fiber drums at room temperature. 

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