The infrared spectra of PET undrawn yarn(UDY),pre-oriented yarn(POY)and fully-drawn yarn(FDY)were re- corded with a Fourier transform infrared spectrometer and an infrared microscope.

• 利用傅里叶变换红外光谱仪和红外显微镜测定了涤纶(PET)的未完全拉伸丝(UDY)、预取向丝(POY)、完全拉伸丝(FDY)的红外光谱,测定了3种纤维的取向度、结晶度。