Fortisan fiber

The structure of the cellulose has a marked influence on the subsequent decomposition [73-77] and less crystalline materials decompose more readily and in terms of thermal decomposition can be rated viscose cord rayon > viscose continuous filament > viscose rayon fiber > Fortisan fiber > Cotton > hydrocellulose. However, hydrocellulose does not follow this rule. 

Figure 5. Smoothed equatorial trace for Fortisan (Cellulose II) fibers with resolved 101, lot, and 002 profiles, and best-fit background...

Table V. Comparison between Cellulose Fibers Spun from Nematic Phase with Fortisan...

The fibers spun from nematic phase systems and solvent composition 25.0/75.0 exhibited twice the tenacity and modulus of those extruded from the system of the solvent composition 29.3/70.7. The two fiber types showed significant differences in birefringence, and in the appearance of their external surfaces and fracture surfaces. The comparable moduli of the fiber spun from a nematic solution with those of Fortisan may result from high uniaxial orientation of cellulose molecules in the former fiber. 

Fig, 1.—Set of F our Diagrams from Ramie and Rayon Fibers, Corresponding to the Four Principal Polymorphs of Cellulose. ((A) Cellulose I (native) from purified ramie fibers, (B) Cellulose II (mercerized or regenerated) from Fortisan fibers, (C) Cellulose III (ammonia) from ramie fibers treated with ethylamine, and (D) Cellulose IV (high temperature) from fibers of ramie cellulose III treated with gIy< rol at 280 .]... 

Figure 6.9 Weight loss and shrinkage vs temperature of Fortisan 36 fiber when heated at 40°C/h in air.

Isotropic viscose model fibers, without stretching Isotropic viscose model fibers, after intense stretching Cuprammonium rayon Fortisan... 

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