Polyethylene fibers surface treatment

The matrices used in sisal fiber-reinforced composites include thermoplastics (polyethylene, polypropylene, polystyrene, PVC, etc.), thermosets (epoxy, polyester, and phenol-formaldehyde resin, etc.), rubber (namral rubber, styrene-buta-diene mbber, etc.) gypsum, and cement. The effects of fiber length, fiber orientation, processing methods, fiber volume fi-action and fiber surface treatment on the mechanical and physical properties of sisal fiber reinforced composites have been smdied. 

Nardin M. and Ward, I.M. (1987). Influence of surface treatment on adhesion of polyethylene fibers. Mater. Sci. Technol. 3, 814-826. 

This chapter is concerned primarily with the surface treatments of high performance fibers, including glass, carbon (or graphite), aramid, polyethylene... 

Gao. S. and Zeng, Y. (1993a). Surface modification of ultrahigh molecular weight polyethylene fibers by plasma treatment. I. Improving surface adhesion. J. Appi. Polym. Sci. 47, 2065-2071. 

Liao B, Huang Y, Cong G (1997) Influence of modified wood fibers on the mechanical properties of wood fiber-reinforced polyethylene. J Appl Polym Sci 66 1561-1568 Mani P, Satyanarayan KG (1990) Effects of the surface treatments of lignocellulosic fibers on their debonding stress. J Adhes Sci Technol 4 17-24... 

Paul A, Joseph K, Thomas S (1997) Effect of surface treatments on the electrical properties of low-density polyethylene composites reinforced with short sisal fibers. Compos Sci Technol 57 67-79... 

Mironov V S, Park M, Chor C, Kim J K, Lim S and Lo H (2002) Influence of carbon surface treatments on the structure and properties of conductive carbon fiber/polyethylene films, J Appl Polym Sci 84 2040-2048. 

Composites of banana, hemp, and agave with high-density polyethylene resin were separately prepared in different ratios 60 40, 55 45, 50 50, and 45 55 (wt/wt). These fibers were also treated with maleic anhydride, and the effect of maleic anhydride on surface resistivity and volume resistivity of wood polymer composites was studied. The surface resistivity decreased with an increase in fiber content in the composites, while volume resistivity increased. The maximum surface resistivity and volume resistivity were observed in the untreated banana fiber composite, while minimum surface resistivity and volume resistivity were found in the maleic anhydride-treated agave fiber composite. The decrement in volume resistivity and surface resistivity was due to the increase in cross-linking between the polymer and fiber by treatment with maleic anhydride. 

Consequently, there was a need for a more stable NiMH separator material to reduce self discharge while still retaining electrolyte crucial for maintaining cycle life. NiMH batteries now have widespread use of what is termed permanently wettable polypropylene. In fact, the polypropylene is a composite of polypropylene and polyethylene fibers where the base composite is hardly wettable to the KOH electrolyte without surface treatment. 

Antistatic Finishes Owing to its hydrophobicity, polyester builds up static charge readily. Finishes have been developed for polyester that increase the hydrophilicity and ionic character of the fiber and permit more ready dissipation of static charge from the fiber surface. These treatments include lauryl phosphate, morpholine, various polyethylene glycols, organosilicones, and polyamine resins. 

Zihlif and Ragosta produced short (1-3 mm) BF-reinforced polystyrene (PS) composite plates and found that the strength of the composite went through a maximum whereas both Young s modulus and the impact resistance increased monotonically with increasing BF content. Bashtannik et alP investigated the fiber-matrix interfacial adhesion in BF composites with high density polyethylene (HDPE) matrix. It was found that the properties of BF-reinforced polymer composites were much more sensitive to the BF surface treatment than traditional fiber-reinforced systems. 

Polyethylene fibers are subject to ozone treatment for modifying their surface [130], The analysis of the surface is carried out by means of X-ray photoelectron (ESCA) and IR (FTIR) spectroscopy. Carbon (C) and oxygen (0) were the main atoms monitored with ESCA (C-ls, 0-ls areas) on the treated fibers. The analysis of C-ls peaks (Cj, and C3) reveals that the oxidation level depends of the ozonation time. The components of Is peak (Oq, Oj, O2) are very useful for carrying out the surface analysis. They demonstrate the presence of carbonyl groups (1740-1700 cm ) even onto untreated fibers whose intensity rises with treatment time. Ozonolysis... 

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