CA
Cellulose Acetate
Glass Transition (Tg)
180–190 °C
Melting Point (Tm)
230–300 °C
Density
1.30 g/cm³
CAS Number
9004-35-7
Recycling Code
♺ 7
Category
Natural
Repeat Unit
–[C₆H₇O₂(OCOCH₃)₃]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
Acetylation breaks the hydrogen-bond network, making cellulose thermoplastic and soluble; needs plasticiser; biodegrades slowly.
Applications
Cigarette filters, eyeglass frames, LCD films, textile fibre.