A microwave heating method was used for oxidative stabilization of polyacrylonitrile (PAN) fibers. The bulk density, chemical structure (FTIR), crystalline structure (WAXD), and skin-core structure were studied. The results show that the intermolecular cyclization happened above 220 °C. From X-ray diffractograms of heat treated fibers, the pre-graphitic structure of stabilized fibers was developed to turbostratic structure. A gradual densification of the fibers occurring was observed after stabilization at a maximum temperature of 240 °C. Microwave heating effectively shortened the thermal stabilization process and the thermal stabilization time by 35 min compared with the conventional thermal stabilization process. The skin-core structure of the stabilized fibers was prohibited by microwave heating.

微波加热方法用于聚丙烯腈（PAN）纤维的氧化稳定化。研究了堆积密度，化学结构（FTIR），晶体结构（WAXD）和皮芯结构。结果表明，分子间环化发生在220°C以上。从热处理纤维的X射线衍射图可以看出，稳定纤维的前石墨结构发展为涡轮层状结构。在最高温度240°C稳定后，观察到纤维逐渐致密化。与传统的热稳定过程相比，微波加热有效地将热稳定过程和热稳定时间缩短了35分钟。微波加热禁止了稳定纤维的皮芯结构。