Element-Block Polymeric Materials Based on Cage Silsesquioxane Frameworks

  • Kensuke NakaEmail author


This chapter focuses on recent efforts to prepare single-component element-block materials based on cage silsesquioxane frameworks. Polyhedral octasilsesquioxanes (POSSs), denoted as (RSiO1.5)8 or labeled T8 cages, are used here as the cage silsesquioxane frameworks. Thermoplastic optically transparent silsesquioxane materials derived from a single cage compound can be achieved by dumbbell- and star-shaped cage structures, allowing precise design of their structures for tuning properties. Incompletely condensed POSS exhibited lower crystallinity without loss of thermal stability in comparison with a completely condensed POSS. Difunctional POSS monomers, which were prepared by a selective corner-opening reaction and a subsequent corner-capping reaction, significantly reduce their crystallinity in comparison with those of monofunctionalized T8 cages. Several examples for polymerization of the difunctional POSS monomers are described.


Cage silsesquioxane POSS Incompletely condensed POSS Difunctional POSS monomer 


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© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Faculty of Molecular Chemistry and Engineering, Graduate School of Science and TechnologyKyoto Institute of TechnologyKyotoJapan

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