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1. PBO Fibres (Zylon)
PBO fibres were first developed in the 1980’s by TOYOBA Corp. Ltd., JAPAN and is the world’s
strongest man-made fibre.
4,6-diamino-1,3-benzene
doldihydrochloride (DABCO)
Terephthallic acid (TA)
Poly(p-phenylene-2,6-benzobisoxazole)
Manufacturing of PBO
PBO is synthesized by condensation polymerization of 4,6 diamino 1,3 benzene
doldihydrochloride ( DABCO ) with terephthalic acid (TA) at 60-80 °C.
The polymerization is carried out in poly (phosphoric) acid (PPA) solvent and molecular weights of
about 50000-100000 g/mol corresponding to about 200-400 repeat units per chain are obtained.
Introduction
2. Properties of PBO Fibres
• Excellent thermal stability
• Excellent strength & modulus
• Good flame resistance
• Excellent creep resistance
• Good chemical resistance
• PBO is a rigid-rod isotropic crystal polymer that is spun by a dry-jet wet spinning process
Various fibre forms of PBO
3. Manufacturing of PBO Fibres
PBO is a rigid rod isotropic polymer crystal polymer spun by dry-jet-wet-spinning process
Schematic illustration of PBO fibres spinning process
5. Applications of PBO Fibres
End User: Army, Navy, Air force, Paramilitary and other Defence Services
Body Armour
High Altitude Balloon Science
