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Synthesis and thermal studies of heterocyclic siloxanes containing boron
Author(s) -
Behbehani Haider S. J.,
Brisdon Brian J.,
McEnaney Brian
Publication year - 1994
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1994.220051004
Subject(s) - materials science , boron , thermal decomposition , pyrolysis , microcrystalline , ring (chemistry) , boron carbide , silicon carbide , boron oxide , inert , chemical engineering , inert gas , benzene , organic chemistry , oxide , composite material , metallurgy , crystallography , chemistry , engineering
Eight‐ and six‐membered cycloborasiloxanes containing two and one boron atoms respectively are strained ring compounds which undergo ring opening polymerization and ring–ring transformation reactions on thermolysis. Prolonged heating at 200°C results in volatilization of the cyclic boroxine (PhBO) 3 , whereas rapid heating of either compound to 1500°C in an inert atmosphere does not result in loss of boron, but affords instead an amorphous residue containing silicon carbide, boron oxide and carbon. Upon further pyrolysis at 1700°C the final product consists of microcrystalline silicon carbide in which are embedded large crystals of boron carbide.