Silsesquioxane-based polymer synthesis

Silsesquioxane-Based Polymers Synthesis of Phenylsilsesquioxanes with Double-Decker Structure and Their Polymers... 

Synthesis of Silsesquioxane Based Polymers and Property of Their Polymers... 

Monomethacrylate-functionalized POSS reagents are capable of being polymerized into novel linear silsesquioxane-based materials. Efforts to copolymerize these methacrylate-functionalized POSS with other acryhc comonomers have been successful [96,112]. In a typical polymer synthesis, a 0.5 M toluene solution of macromonomer was prepared, to which 2,2 -azobis(iso-butyronitrile) (AIBN) based on macromonomer was added from a stock solution. The clear solution was heated at 60 °C for 24 h and then precipitated into methanol. Further purification was performed by reprecipitation from toluene into methanol to yield white powder. 

The synthesis and properties of star polymers and dendrimers functionalized with ferrocene units has attracted a great deal of attention. The synthesis of high-generation dendrimers functionalized with chiral ferrocenyl units in their structures has been reported. The chiroptical properties of this class of dendrimer was dependent on the number of ferrocenyl groups and their chemical environment, but not on their position within the dendrimer. Deschenaux has reported the synthesis of hquid crystalline ferrocene-based polymers prossessing an enantiotropic smectic A phase. Ferrocene-functionahzed cyclic siloxane (29) and silsesquioxane branched polymers have also been reported. A hyperbranched polymer with a cubic silsesquioxane core was used to mediate the electrocatalytic oxidation of ascorbic acid. 

Chapter 5 is a review of polyhedral oligomeric silsesquioxanes (POSS), hybrid POSS-organic copolymers, and POSS resin nanocomposites. Although silsesquioxanes have been known since tiie 1960s, only recently, through controlled synthesis and purification, have their structure and unique properties been determined and their useful applications been explored. This chapter is complemented by a discussion of the synthesis and properties of silica- and silsesquioxanes-containing polymer nanohybrids in Chapter 6. Chapter 7 involves a review of the preparation and characterization of siloxane-based polyviologens, polyurethanes, and divinylben-zene elastomers. 

Kessler D, Theato P (2008) Synthesis of functional inorganic-organic hybrid polymers based on poly(silsesquioxanes) and their thin film properties. Macromolecules 41 5237-5244... 

Pan, G. Mark, J. E. Schaefer, D. W., Synthesis and Characterization of Fillers of Controlled Structure Based on Polyhedral Oligomeric Silsesquioxane Cages, and Their Use in Reinforcing Siloxane Elastomers. J. Polym. Sei., Polym. Phys. Ed. 2003,41,3314-3323. 

In the first half of this article, the features of the formation of cage oligomeric silsesquioxanes, including several new functional cages, were described and a possible reaction mechanism was proposed. Synthesis of selectively functionalized phenyl POSS at the 4-position was reported, based on the new synthetic procedures. In the second half of the article, the formation and utilization of incompletely condensed POSS to construct new polymer structures or higher order structures was described. 

Pan G, Mark JE, Schaefer DW (2003) Synthesis and characterization of fillers of controlled structure based on polyhedral oligomeric silsesquioxane cages and their use in reinforcing siloxane elastomers. J Polym Sci B Polym Phys 41(24) 3314—3323... 

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