High-strength fibers

The conditions of carbonization have impact on properties of carbon fibers and their price. The least expensive carbon fibers manufactured Ifom PAN are produced by rapid heating under tension from the initial orientation temperature of 300°C to 1000°C. This process produces low modulus fibers. High strength fibers... 

Data only for certarn fibers High strength High modulus... 

Boron nitride Silica, fused Zirconium oxide fiber, high strength Boron nitride... 

HSLA steel Polymer fibers High strength, low alloy steel 0.80 207 7.86 0.10 26... 

Most commodity fibers have crystallinity values between 20% and 60%, and crystallinity and molecular orientation together determine the physical properties of the fibers. High strength and high modulus fibers tend to have high crystallinity values, in the range of 90%. 

Fibers High strength unidirectional carbon fiber fabrics provide structural integrity. Glass fiber fabrics are utilized in direct contact with any metallic substrate to serve as a dielectric barrier between any carbon fiber layers and the metallic substrate. 

Bisphenol A. One mole of acetone condenses with two moles of phenol to form bisphenol A [80-05-07] which is used mainly in the production of polycarbonate and epoxy resins. Polycarbonates (qv) are high strength plastics used widely in automotive appHcations and appHances, multilayer containers, and housing appHcations. Epoxy resins (qv) are used in fiber-reinforced larninates, for encapsulating electronic components, and in advanced composites for aircraft—aerospace and automotive appHcations. Bisphenol A is also used for the production of corrosion- and chemical-resistant polyester resins, polysulfone resins, polyetherimide resins, and polyarylate resins. 

Table 6. Properties of Commercial High Strength Fibers ...

After the washing, the fiber is dried, and then is heat-drawn in the same manner as in the case of dehydration—coagulation with salt but to a much higher draw ratio. As a result the finished fiber has high strength and modulus and is, without acetalization, sufficientiy resistant to boiling water. Figure 3 shows schematic fiber stmctures (17). 

Boric acid/alkaU spinning has been commercialized in Kuraray Co. and Unitika Co. in Japan, and is reportedly under research and development also in the People s RepubHc of China as a process for producing high strength PVA fiber to be used for replacing asbestos (9). 

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