ISSN:
1436-2449
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract. The influence of rare earth compounds on the polymerization of cyclosiloxanes has been studied for hexamethylcyclotrisiloxane (D3) and octamethylcyclotetrasiloxane (D4). In both cases, it has been shown that rare earth compounds alone do not lead to well defined polymers: yields are never quantitative and the formation of cyclic side-products is always observed. The influence of these compounds has also been studied in the anionic polymerization of the same cyclosiloxanes initiated by organolithium reagents or fluorides. In the case of D3, it has been shown that back-biting reactions can be slowed down in the presence of rare earth compounds whereas for D4, both polymerization and back-biting reactions get slower.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002890050189
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