Hydrolytic and thermal degradation study of some model and polymeric siloxane compounds

Electronic spectra of polysilanes

“…bp 96 °C (3 mmHg)). 39 Poly(4-methoxyphenylmethylsilane). A 40 wt % sodium dispersion (2.69 g, 46.9 mmol) was added dropwise to a refluxing solution of 4.71 g (21.3 mmol) of (4-methoxyphenyl)methyldichlorosilane in 100 mL of dry toluene contained in a foil-covered reaction vessel.…”

Chemical Recycling of High-Molecular-Weight Organosilicon Compounds in Supercritical Fluids

“…At temperatures above 300 °C, the terminal silanol groups are the Achilles’ heel of siloxane macromolecules responsible for the heterolytic decomposition of the siloxane bond by the “biting off” mechanism of the chain fragments cyclizing. Indeed, the replacement of terminal silanol groups with trimethylsiloxy groups makes it possible to increase temperature stability of PDMS up to 500 °C [ 13 , 14 , 15 ].…”

“…Usually, a very high equilibrium content of low-molecular-weight cyclic products in linear polysiloxanes is noted, which make up significant fractions even at low temperatures [ 13 , 14 , 15 ]. This implies their further growth with increasing temperature.…”