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Polyhedral Oligomeric Silsesquioxanes (POSS)

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Encyclopedia of Polymeric Nanomaterials

Synonyms

Cages; Oligosilsesquioxanes; Polysilsesquioxanes; Silicone resins: Silsesquioxanes

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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Author information

Authors and Affiliations

  1. Dow Corning, Resins, Coatings, and Adhesives Product Development, 299-0108, Ichihara, Chiba, Japan

    Maki Itoh

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  1. Maki Itoh
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Correspondence to Maki Itoh .

Editor information

Editors and Affiliations

  1. Kyoto Institute of Technology R & D Center for Bio-Based Materials, Kyoto, Japan

    Shiro Kobayashi

  2. Max-Planck-Institut für Polymerforschung, Mainz, Germany

    Klaus Müllen

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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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  • Online ISBN: 978-3-642-36199-9

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