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Carbon fiber is produced by HEAT TREATMENT (pyrolysis) of which precursor?
A{'text': 'Cellulose', 'label': 'C'}
B{'text': 'Polyester', 'label': 'D'}
C{'text': 'POLYACRYLONITRILE (PAN) — the dominant precursor; pitch is an alternative for ultra-high-modulus fibers', 'label': 'B'}
D{'text': 'Polyethylene', 'label': 'A'}
Answer & Solution
Correct answer: C. {'text': 'POLYACRYLONITRILE (PAN) — the dominant precursor; pitch is an alternative for ultra-high-modulus fibers', 'label': 'B'}
Two main precursors: PAN (polyacrylonitrile, ~90% of market) and pitch (petroleum-derived). PAN gives high strength/balanced properties; pitch enables ultra-high modulus (>500 GPa) but lower strength. Pyrolysis 1000-3000°C in inert atmosphere drives off non-carbon atoms.
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