Spin fiber

Polyacrylonitrile is soluble in TV, V-dimethylformamide (DMF) => the solution can be used to spin fibers. 

The first spinning experiments were performed with dissolved raw silk of the silkworm Bombyx mori [31] and the golden orb-weaver Nephila clavipes [32]. For this purpose a minimized wet-spinning apparatus was constructed [31]. The apparatus was capable of spinning fibers from solutions containing 10 mg of soluble protein. 

PVA in, 25 615-617 MPDI fibers in, 19 733-734 Textile spinning, fiber orientation in, 17 470... 

Alkali treatment is used to solubilize and isolate proteins, to improve foaming and emulsifying properties, and to obtain protein solutions suitable for spinning fibers (17) ... 

Derive eqn. (6.89), which describes the velocity distribution along a spinning fiber using a shear thinning power law viscosity model. 

A variation on this approach used multifilament coextrusion, so-called microfabrication by coextrusion (MFCX) . A limitation of the single-filament process is the size of the filament. The rheological properties of the polymer/ ceramic blends make spinning fibers smaller than 250 pm very difficult. Additionally, spooling fine-diameter fibers is quite challenging. The MFCX is shown schematically in Fig. 1.3. The setup is the same as that used to spin fibers except that the spinneret is replaced with an extrusion die with a diameter between 1 mm and 6 mm. Two separate extrusion steps are used. In the first step, coarse primary filaments are extruded from the feedrod (Fig. 

Melt spinning Fiber increased melt-pressing increased ... 

Spinning Fibers increased composite increased by from... 

Generally, synthetic polymers are made into fibers by a process known as fiber spinning. Fiber spinning is the process of extruding a liquid through small holes... 

Spinning fibers from a melt is perhaps the most common technique used to make fibers from polymeric and silica-based glasses. Such a technique, however, is not very suitable for metallic fibers because molten metals have very low viscosity. 

When hydrogen bonds are established along a preferred direction, it is possible to extrude reasonably strong fibers from the melt [54-56] or from a concentrated solution [57-59]. For example, utilizing the CTC backbone (Sect. 2.1.3) substituted by branched alkylsilyl sidechains, Araki et al. succeeded in spinning fibers with tensile strengths in the 1 MPa range [56]. 

LCP block copolymer of the type -trod] -tcoil] - with PET, PBT, PA for spinning fibers with high mechanical properties and low shrinkage Dashevsky etal., 1993, 1994... 

MAJOR USES Solvent in the manufacture of pharmaceuticals used for spinning fibers, casting and molding plastic materials used in lithium batteries used in the extraction of fatty acids from animal and vegetable oils used in chemical laboratories for the detection of materials such as pesticide residues. 

Acetonitrile is used as a solvent for polymers, spinning fibers, casting and molding plastics, and HPLC analyses for extraction of butadiene and other olefins from hydrocarbon streams in dyeing and coating textiles and as a stabilizer for chlorinated solvents. It occurs in coal tar and forms as a by-product when acrylonitrile is made. 

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