PDPhSM at room temperature

Fig. 13. " Si CP/MAS (a) and - Si DD/MAS NMR (b) spectra of PDPhSM at room temperature. The signal corresponding to the non-crystalline region is indicated by an asterisk.

Fig. 16. CP+DDph NMR spectra in the phenyl region of PMPhSM (a) at room temperature and PDPhSM at room temperature, (b) at 113°C, and (c) at 226 C.

CP/MAS NMR spectrum of PDPhSM, shown in Fig. 14, is very complicated and contains some peaks which arise because the molecular motion of the phenyl rings of PDPhSM is restricted at room temperature. There are two signals at 0.0 and —3.1 ppm which are assigned to the main chain methylene group in a similar manner to the Si NMR result. Thus, there exists two conformational isomers in the crystalline region of PDPhSM. 

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