✍ Scribed by Sugio Ōtani
No coin nor oath required. For personal study only.
A new carbon fiber was prepared from the molten pyrolysis products such as polyvinylchloride pitch (PVC pitch) which are prepared by heating at 400°C under nitrogen. The PVC pitch gradually soften over 150°C and turns into viscous liquid over 200°C. When the viscous molten PVC pitch is rapidly drawn out, fme filaments can be formed. The pitch filament was oxidized with Ozone and air below 260°C to prevent from melting at a higher temperature and then carbonized under nitrogen at the range of temperature from 500°C to 135OC. The typical properties of the carbon fiber prepared at 1000°C are summarised as follows: Tenacity 8 * 18 x 106 g/m? Initial modulus 2 N 5 x 10s g/cm* Electric resistivity 9.2 x 1P Ckm. Breaking extension 2 N 3 y0 Specific gravity 1.68 g/cm* Original PVC pitch consisted of the polynuclear aromatic compounds such as C*r Hss possessing three or four aromatic nuclei composed of three or four rings in a molecule. A large number of linkages between the aromatic plane fragments caused by the preoxidation treatment prevents not only melting but also the crystal growth on the advanced carbonization process. Consequently, X-ray d&action analvsis of the carbon fiber showed no fiber structure and a very broad difTraction pattern such as typi& hard carbon. C 31
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