Frictional Properties of Fibers

Table 3-22. Wear and Friction Properties of Fiber-Reinforced Plastics... 

Frictional properties of fibers affect the processing, structure and properties of all fiber-based products. For example, friction is the force that holds the fibers together in yams and fabrics. Without sufficient friction, the strength and stmctural integrity of yams and fabrics will be lost. However, if the friction is too high, it could cause equipment failure, fiber surface damage, and even fiber breakage. Chapter 19 addresses the basic principles associated with the frictional properties of polymer fibers. 

The hair shaft (Figure 6.1) comprises three main structures (1) the outer cuticle responsible for the main optical and frictional properties of the fiber (2) the cortex, responsible for the bulk fiber mechanical properties such as strength and flexibility and (3) the porous medulla, which is more prominent in gray hair, but otherwise may or may not be present. Cuticle thickness varies markedly between species. Though much of our understanding of hair structural biology is derived from the study of wool, this homologous... 

Polytetrafluoroethylene, molybdenum disulfide, graphite, and aramid fibers reduce the frictional coefficient. These may be used as single friction additive, in combination with other fillers, and in combination with silicone oil. Table 5.17 illustrates effect of PTFE on the frictional properties of different polymers. 

Oksman K (2001) Mechanical properties and morphology of flax fiber reinforced melamine-formaldehyde composites. Polym Compos 22(4) 568—578 Oomah D (2001) Flaxseed as a functional food source. J Sci Agric 81(9) 889-894 Opoku A, Panigrahi S, Tabil L (2007) Frictional properties of natural and chemically treated flax fiber. In 2007 AS ABE Annual International Meeting, vol 13, Technical Paper NumbCT 076188 Minneapolis, MN, 17—20 June 2007... 

Sharma D (2004) India automotive components industry, Swiss Business Hub India, pp 1-20 Sink SE (2005) Specials reported cars made of plants, http //www.edmunds.com Bolton J (1997) Plant fibers in composite materials a review of technical challenges and opportunities. The Burgess-Lane Memorial Lectureship in Forestry, March 5 138. 3 X, Xu CG, Qing LF (2007) Friction properties of sisal fiber reinforced resin brake composites. Wear 262 736-741... 

In Older to compare the friction properties of the PCL flocked surfaces, experiments were conducted on some aluntinum surfaces flocked with some conventional flock fibers. These were 2 denier PET (0.69 nun length), 25 denier... 

Wang, X.Y., Gong, R.H., Dong, Z., Porat, I., 2006. Frictional properties of thermally bonded 3D nonwoven fabrics prepared from polypropylene/polyester bi-component staple fiber. Polym. Eng. Sci. 46 (7), 853-863. 

COMPARISON WITH COMPETITIVE MATERIALS Frictional properties of thermoplastics differ from those of metals. Wear of metals depends on adhesive, abrasive, fatigue, and pressure wear. In the case of plastics wear depends on adhesion and deformation of softer plastic material. Frictional forces are proportional to velocity rather than load as is the case of metals. It is always advantageous to combine two different plastics to work together (as opposite to one plastics material for two working together parts). Reinforcement by glass, carbon, and aramid fibers enhances wear resistance by increasing thermal conductivity and creep resistance. 

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