Abstract
Polyfunctional, thermal condensation of 2,2-dichlorotetraphenylcyclotrisiloxane and its derivatives results in formation of organospirocyclosiloxanes, the structure of which has been confirmed by infrared, PMR and mass spectroscopy. Diastereomers of methylphenylspirobicyclosiloxanes have been isolated in the pure state. The anionic polymerization of spirobicyclosiloxanes containing methyl and phenyl side groups in various combinations has been investigated. It is shown that the process is complex and results in simultaneous formation of crosslinked and soluble polycyclic polymeric structures. The effect on the polymerization process of the structure of the original spiro-ring compounds, of temperature and of initiator concentration, has been studied. It is shown that it is possible to convert the crosslinked structures to spirocyclic structures and also to synthesize linear polymers with cyclic fragments in the chain. The physicomechanical properties of the polymerization products have been investigated.
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