PEKK
Polyether Ketone Ketone
Glass Transition (Tg)
~160 °C
Melting Point (Tm)
305–360 °C
Density
1.28–1.30 g/cm³
CAS Number
74970-25-5
Recycling Code
♺ 7
Category
High-Performance
Repeat Unit
–[O–C₆H₄–CO–C₆H₄–CO]ₙ–
The repeating unit is the smallest structural fragment whose repetition builds the whole chain. Subscripts show the relative share of each unit in copolymers.
Key Properties
Crystallisation rate and Tm tunable via isomer ratio (T/I), which makes it far more amenable to 3D printing and composite processing than PEEK.
Applications
Aerospace composite matrix, additive manufacturing, cranial implants.