Definition
Among the M [R3SiO1/2], D [R2SiO2/2], T [RSiO3/2], and Q [SiO4/2] siloxane units, silicone resins mainly consist of T and Q units. The term “silsesquioxane” refers to silicone resins which consist only of T units (sesqui means 1.5 because in the T structure having three siloxane bonds, one oxygen atom is shared by the adjacent silicon atoms). Polyhedral oligomeric silsesquioxanes (POSS) are cage-like oligomer molecules of defined structures mainly consisting of cyclotri-, cyclotetra-, and cyclopenta-siloxane rings based on RT3 [RSiO3/2] unit for completely condensed cages in combination with RT2 [RSi(OH)O2/2] for incompletely condensed cages. Such cage structures are not just specific to silsesquioxanes, but general silicone resins have more or less such structures.
Introduction
Polysiloxanes or silicones based on Si–O–Si bonding are classified into oils or elastomers that mainly...
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Itoh, M. (2014). Polyhedral Oligomeric Silsesquioxanes (POSS). In: Kobayashi, S., Müllen, K. (eds) Encyclopedia of Polymeric Nanomaterials. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36199-9_220-1
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DOI: https://doi.org/10.1007/978-3-642-36199-9_220-1
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