A NEW PEAK （T4） IN THE 13C-NMR SPECTRUM OF POLYBUTADIENE

摘要

＜正＞ A new peak at 39.0 ppm in the 13C-NMR spectrum of polybutadiene （PBD） was discovered. This peak is assigned to the fourth peak （T4） of trans-1,4-sequence marked with an asterisk as shown in Fig. 3 in the text.The occurrence of T4 carbon nuclei is strongly affected by their neighboring 1,2-units. So long as both contents of trans-1,4- and 1,2-units attain their proper amounts the peak （T4） with appear in the 13C-NMR spectrum of PBD.