By Jean-Baptiste Donnet

"Third version deals the most recent details at the structural, floor, mechanical, digital, thermal, and magnetic homes of carbon fibers in addition to their manufacture and business purposes from some of the world's so much distinct experts within the box. "

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Peng, Jean-Baptiste Donnet, Tong Kuan Wang, and Serge Rebouillat 161 4. Surface Properties of Carbon Fibers Tong Kuan Wang, Jean-Baptiste Donnet, Jimmy C. M. Peng, and Serge Rebouillat 231 5. Mechanical Properties of Carbon Fibers L. H. Peebles, Yuri G. Yanovsky, Anatoly G. Sirota, Valery V. Bogdanov, and P. M. Levit 311 Page vi 6. Electrical and Thermal Transport in Carbon Fibers Jean-Pierre Issi and B. Nysten 371 7. Carbon Fiber Applications Serge Rebouillat, Jimmy C. M. Peng, Jean-Baptiste Donnet, and Seung-Kou Ryu 463 Author Index 543 Subject Index 567 Page vii Contributors O.

4. It results in high carbon yield (5055%) when pyrolyzed to 1000°C and above. Figure 1 Structural formula of polyacrylonitrile (PAN). 1 Background Thermal stability of polyacrylonitrile fibers was recognized [8], soon after its development by DuPont company in the 1940s. At the time, cellulose fibers and PAN (homopolymer) fibers were the only fibrous substances which did not melt below their charring temperatures and were therefore capable of retaining their fiber identity. , research Laboratories, investigated DuPont's early PAN fibers as precursor for carbon fibers near the end of World War II [8].

Physical shrinkage plays an important role in cyclization and the subsequent reactions which occur at 180°C and above. A regular positioning of nitrile groups in the molecular chains is required for these reactions [146,147]. This conformation is adversely affected during heat treatment when the molecular chains relax and physical shrinkage appears. The molecular relaxation can be prevented by applying tension to the fiber during heat treatment. The application of a very high tension during stabilization may cause deterioration of the mechanical properties of the fiber because it may disturb the preferred orientation required for the cyclization reaction causing rupture of bonds [149].

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