Polymerization of mixed diphenyldimethylcyclosiloxanes

Андрианов, К. А.; Yakushkina, S.Ye.; Guniava, L.N.

doi:10.1016/0032-3950(66)90248-6

Cited by 7 publications

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“…Until very recently, no effective methods for the synthesis of mixed cyclotetrasiloxanes could be observed in the literature. For instance, mixed dimethylcyclotetrasiloxanes containing one silicon atom with different substituents can be synthesized via the cohydrolysis of dichlorodimethylsilane and the corresponding dichlorodiorganosilane, but the yield of the target cyclosiloxane does not exceed 30% [ 33 , 34 , 35 ]. Another approach is the heterofunctional condensation of hexamethyltrisiloxanes with terminal chloro- [ 36 ], hydro- [ 37 , 38 ] and hydroxy-groups [ 39 , 40 ] and the corresponding diorganosilanediols, diorganodialkoxy- or chlorosilanes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers

et al. 2021

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This paper reports a method for the synthesis of 1,1,3,3,5,5-hexamethyl-7,7-diorganocyclotetrasiloxanes by the interaction of 1,5-disodiumoxyhexamethylsiloxane with dichlorodiorganosilanes such as methyl-, methylvinyl-, methylphenyl-, diphenyl- and diethyl dichlorosilanes. Depending on the reaction conditions, the preparative yield of the target cyclotetrasiloxanes is 55–75%. Along with mixed cyclotetrasiloxanes, the proposed method leads to the formation of polymers with regular alternation of diorganosylil and dimethylsylil units. For example, in the case of dichlorodiethylsilane, 70% content of linear poly(diethyl)dimethylsiloxanes with regular alternation of units can be achieved in the reaction product. Using 7,7-diethyl-1,1,3,3,5,5-hexamethylcyclotetrasiloxane as an example, the prospects of the mixed cycle in copolymer preparation in comparison with the copolymerization of octamethyl- and octaethylcyclotetrasiloxanes are shown.

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