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2.6.3 Aramid Fiber-Reinforced Polymer Composites

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Aramid fibers materials possess high-strength, high-modulus and are known for their outstanding strength-to weight ratios, which is even superior to metals [9]. Chemically, this group of materials is known as poly (paraphenylene terephthalamide). Most common aramid materials are Kevlar (Kevlar 29, 49, and 149) and Nomex. The rigid molecules get aligned in the direction of the fiber axis, as liquid crystal domains during the synthesis process. These fibers have very high longitudinal tensile strengths and tensile moduli but are relatively weak in compression. They are also tough, resistant to creep, resistant to fire and quite stable at relatively high temperatures; in the range -200 and 200 °C [6]. These composites are prone to acidic degradation, yet are fairly inert in other solvents. Mostly, they mostly used in composites in which the matrix materials are either epoxies or polyesters. Owing to their great flexibility, these fibers can be easily processed using common textile operations. They are used in applications involving automotive brake and clutch linings, ropes, pressure vessels, sporting goods, bulletproof vests and armor, missile cases and sporting goods,

Metal Oxide Nanocomposites

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