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Citation:
ZHANG Xinsheng, CHEN Suming, SHI Lianghe. STUDIES ON REGULARITY OF POLY PHENYLSILSESQUIOXANE CHAINS[J]. Chinese Journal of Polymer Science,
;1987, 5(2): 162-168.
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IR and 29Si NMR were used to determine the structures of ladderlike polymer polyphenylsilsesquioxanes (PPS). It was found that PPS with lots of defects had a wide and strong absorption band in 1000—1400 cm-1 with only one sharp peak at 1137 cm-1 while two peaks (1130 and 1045 cm-1 were observed for PPS with perfect ladderlike structure. Branching and crosslinking of PPS lead to the reduction of 1045 cm-1 peak. 29Si NMR spectra, however, showed two peaks (δ=-78 ppm and -87 ppm when δHMDS=0ppm)for defective or branched PPS.The -87 ppm peak is related to the ladderlikely constructed Si atoms and -78 ppm corresponds to defective Si atoms.PPS with defects less than 0.1% chain units was obtained by azeotropic polycondensations.
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