Keywords polyacrylonitrile-based carbon fiber;FTIR microspectroscopy;dichroism;preoxidized yarn;orientation;mechanical properties;Fourier transform infrared spectrometry;

• 聚丙烯腈基碳纤维;显微红外;二向色性;预氧丝;取向;力学性能;傅里叶变换红外光谱;