PAN
Polyacrylonitrile
Glass Transition (Tg)
85–105 °C
Melting Point (Tm)
— (decomposes before melting)
Density
1.18 g/cm³
CAS Number
25014-41-9
Recycling Code
♺ 7
Category
Functional & Smart
Repeat Unit
–[CH₂–CH(CN)]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
Strong dipole interactions between nitrile groups prevent melting; the precursor for over 90 % of the world's carbon fibre via stabilisation and carbonisation.
Applications
Carbon-fibre precursor, acrylic fibre, ultrafiltration membranes.