Polyhedral oligomeric silsesquioxanes compounds

Controlled hydrolysis of RSiX3 compounds gives so-called silsesquioxanes or POSS compounds (Polyhedral Oligomeric SilSesquioxane), which can be used as models for silica surfaces or supports for catalysts [4] (Figure 18.2, schematic structure on the right). 

It has been known for some time that SiO cage compounds, polyhedral oligomeric silsesquioxanes (POSS), are important three-dimensional materials for both lubricants and coatings (56). Very recently, there has been increasing interest in the titanium analogs of the POSS, both fully and partially substituted POSS. Important issues include the structure of the Ti cage compounds, their... 

Polysilsesquioxanes are a class of compounds having the emperical formula [RSi(0)3/2] , in which three oxygen atoms and one alkyl or aryl group are attached to the silicon atom. These compounds are formed under various reaction conditions and can take various three-dimensional structures. They can be random, ladder, or even cage. Polyhedral oligomeric silsesquioxane (POSS) is usually abbreviated as T , in which n indicates the number of silicon atoms in the frame structure. 

When an allylated novolac/BMI resin was compounded with polyhedral oligomeric silsesquioxane (BOSS), in the presence of octamaleimidophenyl polyhedral silsesquioxane (OMPS) as a co-curing reagent, materials with POSS cages uniformly distributed in the network resulted (Li et al. 2007). Their enhanced thermal stability is the result of the higher cross-Unk density and the inorganic nature of POSS. 

Polyhedral oligomeric silsesquioxanes (POSSs) could be used as building blocks for multifunctional composite solids and for hierarchical inorganic/organic hybrid architectures. These compounds may include inert hydrocarbon moieties, reactive groups, and... 

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