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A review of heat treatment on polyacrylonitrile fiber

机译：聚丙烯腈纤维的热处理研究进展

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Developing carbon fiber from polyacrylonitrile (PAN) based fiber is generally subjected to three processes namely stabilization, carbonization, and graphitization under controlled conditions. The PAN fiber is first stretched and simultaneously oxidized in a temperature range of 200-300℃. This treatment converts thermoplastic PAN to a non-plastic cyclic or a ladder compound. After oxidation, the fibers are carbonized at about 1000℃ in inert atmosphere which is usually nitrogen. Then, in order to improve the ordering and orientation of the crystallites in the direction of the fiber axis, the fiber must be heated at about 1500-3000℃ until the polymer contains 92-100%. High temperature process generally leads to higher modulus fibers which expel impurities in the chain as volatile by-products. During heating treatment, the fiber shrinks in diameter, builds the structure into a large structure and upgrades the strength by removing the initial nitrogen content of PAN precursor and the timing of nitrogen. With better-controlled condition, the strength of the fiber can achieve up to 400 GPa after this pyrolysis process.
机译：由聚丙烯腈（PAN）基纤维开发碳纤维通常在受控条件下经历三个过程，即稳定化，碳化和石墨化。 PAN纤维先在200-300℃的温度范围内拉伸并同时氧化。此处理将热塑性PAN转换为非塑料环状或梯形化合物。氧化后，纤维在惰性气体（通常为氮气）中于约1000℃碳化。然后，为了改善微晶在纤维轴方向上的有序排列和取向，必须将纤维加热到约1500-3000℃，直到聚合物含量为92-100％。高温过程通常会导致模量更高的纤维，这些纤维以挥发性副产物的形式排出链中的杂质。在热处理过程中，纤维直径缩小，将结构构建为大型结构，并通过去除PAN前体的初始氮含量和氮的添加时间来提高强度。在更好的控制条件下，经过这种热解过程，纤维的强度可以达到400 GPa。

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