STUDIES ON REGULARITY OF POLY PHENYLSILSESQUIOXANE CHAINS

ZHANG Xinsheng; CHEN Suming; SHI Lianghe

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STUDIES ON REGULARITY OF POLY PHENYLSILSESQUIOXANE CHAINS

Papers | Updated：2021-06-21

- STUDIES ON REGULARITY OF POLY PHENYLSILSESQUIOXANE CHAINS
- Vol. 5, Issue 2, Pages: 162-168(1987)
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- Published：20 June 1987
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ZHANG Xinsheng, CHEN Suming, SHI Lianghe. STUDIES ON REGULARITY OF POLY PHENYLSILSESQUIOXANE CHAINS[J]. 1987, 5(2): 162-168.
DOI：

ZHANG Xinsheng, CHEN Suming, SHI Lianghe. STUDIES ON REGULARITY OF POLY PHENYLSILSESQUIOXANE CHAINS[J]. 1987, 5(2): 162-168. DOI：

摘要

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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