Kevlar pulp

Kevlar pulp can be used in thermosets, thermoplastics and elastomers. Injection-moldable pellets consisting of short Kevlar fibers in a thermoplastic resin can be made These can be blended with unreinforced resins to obtain a composite with the desired volume fraction of reinforcement. 

Figure 1. STM image of the microporous structure of activated carbon fiber prepared from Kevlar pulp. Reprinted with permission from ref. 15. Copyright 2001 American Chemical Society.

Recent developments by DuPont in high performance car tyres have shown that inclusion of para-aramid as Kevlar EE, which is a pre-dispersed form of Kevlar pulp, in the rubber sidewall apex increases stiffness and improves cornering efficiency. The apex is part of the located radially outward of the tyre s bead (see Fig. 11.1 (a) and (b)). The EE stands for Engineered Elastomer and DuPont has introduced Kevlar EE into beltings, seals and gaskets, and bicycle tyres to improve resistance to abrasion, tear and puncture, modulus, and cut and chip resistance. ... 

Wu, J. and Cheng, X. H. (2006). The tribological properties of Kevlar pulp reinforced epoxy composites under dry sliding and water lubricated condition. Wear26 ( - 2), 1293-1297. 

Figure 4.19 Different forms in which Kevlar aramid fiber is available pulp, floe, staple, and continuous fiber woven into a variety of fabrics (courtesy of Du Pont).

Fibrillated aramid (Kevlar and Twaron ) pulps are widely used as a moderately heat-resistant reinforcement in friction formulations. Aramid pulps provide briquettability for preforms, improve friction and wear characteristics, help modify compressibility, and aid in noise damping. However, these flbers are one of the most expensive raw materials used in friction materials. 

Source From DuPont Technical Guide for Kevlar Aramid Fiber, H-77848, 4/00 DuPont Technical Guide for Nomex Brand Aramid Fiber, H-52720, 7/01 Teijin Ltd., Teijinconex Heat Resistant Aramids Fiber 02.05 Teijin Ltd., High Tenacity Aramids Fibre Technora TIE-05/87.5 Akzo Nobel, Twaron—Product Information Yarns, Fibers and Pulp. 

FIGURE 13.14 Scanning electron micrograph of Kevlar brand pulp. 

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