ABSTRACT
A third area where lubricants are often required is in the end use. For some applications, high friction is desirable, others need very low friction, and still others need an intermediate friction, but it must be of the correct level. For example, in polyaramid body armor, if the interfiber friction is too low, the fibers spread apart when the projectile hits the garment, allowing it to penetrate easily. If the interfiber friction is too high, the fabric is extreme stiff and terribly uncomfortable. Fibers used to reinforce rubber goods (tires, belts) must adhere to the rubber. Frequently, the adhesion is imparted via a surface adhesionpromoting layer. Carpet fibers must not pick up oil (soil) and must dissipate triboelectric charges caused by walking across the surface. Apparel fibers must continue to have reduced friction to impart softness, yet not pick up body oils (ring around the collar). Obviously, this is a daunting task.
