Synthesis of polydimethylsiloxanes in the main chain containing cyclotrisilazane
Fan, ZD; Xie, ZM
AbstractAlthough the catalytic activity of hexaphenylcyclo-trisilazane trilithium salt is much lower than that of hexamethylcylotrisilazane trilithium salt due to the inductive and steric effect of phenyl group, the thermal and hydrolytic stability of hexaphenylcyclotrisilazane is much higher than that of hexamethylcyclotrisilazane. By using a polar solvent, such as 1,4-dioxane, etc., hexaphenylcyclo-trisilazane trilithium salt is prepared through the reaction of hexaphenylcycoltrisilazane and n-BuLi at low temperature. Ring-opening polymerization of cyclosiloxane using hexaphenylcyclotrisilazane trilithium salt as a catalyst and THF, Diglyme of DMSO as a promoter is carried out. The polymer is characterized by H-1-NMR, Si-29-NMr, GpC limiting viscosity number measurement. Nitrogen content of the polymer is determined by means of coulometric titration. It is confirmed hat the polymer contains hexaphenylclotrisilazane. The relation between the weight-average molecular weight and the limiting viscosity number of the polymer has been studied.
KeywordHexaphenylcyclotrisilazane Trilithium Salt Anionic Polymerization Polysiloxane
Indexed BySCI
WOS IDWOS:000084643000010
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorFan, ZD
AffiliationChinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Fan, ZD,Xie, ZM. Synthesis of polydimethylsiloxanes in the main chain containing cyclotrisilazane[J]. ACTA POLYMERICA SINICA,1999(6):704-708.
APA Fan, ZD,&Xie, ZM.(1999).Synthesis of polydimethylsiloxanes in the main chain containing cyclotrisilazane.ACTA POLYMERICA SINICA(6),704-708.
MLA Fan, ZD,et al."Synthesis of polydimethylsiloxanes in the main chain containing cyclotrisilazane".ACTA POLYMERICA SINICA .6(1999):704-708.
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