SCF-reinforced composites

Deformation of SCF-reinforced composites 4.2.1. Carbon fiber-polymer matrix interface 

These tensile properties improve with increasing fiber loading. The tensile properties of SCF/PVDF composites are listed in Table 4.1. At 5 wt% SCF, the Young s modulus of pristine and fluorinated SCF reinforced composites is 1.88 to 3.0 GPa respectively. Thus plasma treated fibers improves the stiffness. At 15 wt% fiber loading, the improvement 

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Figure 4.5. SEM micrographs of APF-treated SCF reinforced composites with (a) 10 wt% and (b) 15 wt% fiber loading [20]...

The SCF composites also find application as load-bearing materials in orthopedics [7]. Comparing with unidirectionally aligned CF composites, less information is available in literature concerning the mechanical and fracture properties of SCF reinforced polymers. 

El-Tayeb, N. S. M. (2008b). Abrasive wear performance of untreated SCF reinforced polymer composite. Journal of Materials Processing Technology IfS f- ,), 305-314. 

N.S.M El-Tayeb, Abrasive Wear Performance of Untreated SCF Reinforced Polymer Composite, Journal of Material Processing Technology, 206,305-314 (2008). 

Figure 4.4. Tensile stress-strain curves of pure PVDF and its composites reinforced with 5,10 and 15 wt% pristine and air plasma fluorinated (APF) SCFs [20]...

For instance, Soykeabkaew et al. (2004) prepared cellulose liber-reinforced starch-based composite foams (SCFs) by baking process. SCFs were prepared successfully by baking starch-based batters incorporating either jute or flax fibers inside a hot mold. Starch is an alternative material for making foams. Batters of starch and water can readily be baked in a closed, heated mold where the starch granules gelatinize and the evaporation of water causes the starch to foam out and take up the shape of the mold. Foams made from pure starch have major drawbacks on their brittleness and sensitivity to moisture and water. Since both the fibers and the starch matrix were naturally polar and hydrophilic, strong interaction between them was expected. 

Figure 4. Wear process of short carbon fiber-reinforced epoxy composite (5 vol.% graphite, 5 vol.% PTFE, 15 vol.% SCF) (a) fiber thinning, (b) fiber breakage, and (c) fiber pulverization and Interfacial removal. Wear conditions normal pressure = 1 MPa, sliding velocity = 1 m/s, duration = 20 h, pin-on-disk apparatus.

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