As pyrolytic temperature raised PAN linear type structure is converted to a ladder polymer with large conjugated structure of naphthyridine rings, and crosslinked to form a network lamellar structure with aromatic six-membered rings like graphite. 随着热解温度的提高,PAN线型结构转变成具有萘啶环大共轭结构的梯形高聚物,继而生成相互交联而成的共轭碳的类石墨芳香族六角网状层面结构。