KYNOLTM ACTIVATED CARBON FIBERS
KynolTM novoloid fibers and textiles are transformed into activated carbon by a one-step process combining both carbonization and activation. As in the case of carbonization, activation can be carried out using either novoloid tow or finished products such as felts and fabrics. Surface area of the activated material can approach 3000 m2/g. The accompanying table shows typical properties of KynolTM activated carbon fibers; data for PAN- and rayon-based activated carbon fibers and for granulated activated carbon are presented for comparison. The pliability and strength of KynolTM activated carbon fibers are distinct advantages.

The pores of KynolTM activated carbon fibers are generally uniform in size and straight, rather than branched as in granules. Pore radius and volume increase with increasing activation (surface area), and thus may be controlled for selective adsorption of polypeptides and similar large molecules. The pore configuration and high surface-to-volume ratio of the fibers, compared to granular activated carbon, permit extremely rapid and efficient adsorption and desorption.
Typical Properties of Activated Carbon Fibers
Property Precursor
Novoloid Novoloid PANa Rayona Granules
yield, wt% 33 22 15 7  
diameter, m 9.2 8.5 ca 5 ca 10  
pH 7.3 7.5 8.0   6.3
pore density specific surface areab, m2/g 1500 2000 870, max 1450, max 910, typical
pore volumec, cm3/g 0.63 0.75 0.28 0.53 0.42
mechanical properties tensile strength, kg/mm2 40 35 30 7  
elongation, % 2.8 2.7 too low to measure
modulus, kg/mm2 1400 1200 8000     
gas adsorption capacity at 20 Cd, wt % benzene 53 67 34 46 33
toluene 57 80 32 47 35
trichloroethylene 83 104 53   61
moisture regain(20 C, 65% RH), wt% 37 20 30   27
methylene blue adsorption capacitye, ml/g 200 300 40   100

a) Owing to their partially crystalline structure, these examples represent the practical limits of activation for these fibers. PAN=polyacrylonitrile

b) BET method.
c) Steam adsorption method.
d) JIS K-1474 Japan industry standard.
e) JIS K-1470 Japan industry standard.
 
 
Typical Applications 
  • Bandages for malodorous wounds
  • Dialysis filters
  • Air purification filters
  • Liquid purification filters
  • Radiation-proof filters
  • Ozone eliminators for electrostatic copiers
  • Masks for odor and noxious gases
  • Chemical protective apparel
  • Cigarette filters
  • Sanitary napkins
  • Electrical and electronic products