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Synthesis and characterization of ladder-like phenylene-bridged polysiloxanes

✍ Scribed by Xinyu Cao; Letian Wang; Bo Li; Rongben Zhang

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
302 KB
Volume
8
Category
Article
ISSN
1042-7147

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✦ Synopsis

Soluble ladder-like phenylene-bridged polymethylsiloxane and polyvinylsiloxane were synthesized by precoupling, hydrolysis and polycondensation consecutively. They were characterized by infrared, 1 H-NMR (nuclear magnetic resonance), 13 C-NMR, 29 Si-NMR, differential scanning calorimetry, X-ray diffraction, elementary analysis, viscosity and gel permeation chromatography measurement, etc., and proved to possess a ladder-like molecule structure.

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## Abstract As a continuation of our previous studies on thermostable materials, heptacyclic laddersiloxanes and ladder polysilsesquioxane were synthesized. The first heptacyclic laddersiloxanes were obtained by chlorination of pentacyclic laddersiloxanes prepared using our stereocontrolled synthes