A STUDY ON THE ORIENTATION OF MOLECULAR CHAINS OF HARD ELASTIC PP FILM IN THE CRYSTAL LINE AND AMORPHOUS PHASE
硬弹性聚丙烯晶相和非晶相分子链取向的研究

The orientation behaviour of molecular chains of hard elastic polypropylene(HEPP) film was investigated on the uniaxial stretching by polarized IR Vibration-Mechanical Spectrosco-py. It was found that there are three components in the IR spectrum between 1130 cm-1 and 1190 cm-1. The orientation behaviour was measured using second derivative, deconvolution, curve-fitting programs and IR differencial spectra technology by computer. The bands at 1167 cm-1 and 1152 cm-1 may be related to the crytal conformation of HEPP long and short spiral chains respectively. The dichroism change of 1167 cm-1 band to different draw ratio is in agreement with 998 cm-1 crystal band on polarized IR spectra. A new band at 1159 cm-1 can be assigned to the amorphous band.