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Necklace-Shaped Dimethylsiloxane Polymers Bearing Polyhedral Oligomeric Silsesquioxane Cages as a New Type of Organic–Inorganic Hybrid

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New Polymeric Materials Based on Element-Blocks

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Abstract

A series of necklace-shaped alternating siloxane copolymers that consisted of a bifunctional polyhedral oligomeric silsesquioxane (POSS) cage and flexible linear dimethyloligosiloxane (DMS) chain segment have been synthesized from bifunctional POSS molecules by two different synthetic methodologies, polycon-densation and ring-opening polymerization. Necklace-shaped POSS-DMS polymers with three different chain arrangements, “constant chain,” “random chain,” and “alternating modulated chain,” have been synthesized. The necklace-shaped POSS-DMS polymers gave transparent thermoplastic and thermosetting plastics with high heat resistance upon cross-linking at the end of the polymers. The controllable structural diversity of these polymers allows control of their physical properties such as flexibility and glass transition temperature. These necklace-shaped polymers consisting of bulky functional inorganic units and alternately connected short soft chains will pave the way to inorganic soft materials, which are novel inorganic materials that can be handled like an organic polymer possessing solubility, plasticity, or entropic elasticity.

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Acknowledgments

I am deeply grateful to the students who engaged in this research and JNC Corporation and JNC Petrochemical Corporation for continued collaboration. This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas “New Polymeric Materials Based on Element-Blocks” (24102006) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.

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  1. Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto, Japan

    Masashi Kunitake

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  1. Masashi Kunitake
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Correspondence to Masashi Kunitake .

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  1. Department of Polymer Chemistry, Kyoto University, Kyoto, Japan

    Yoshiki Chujo

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Kunitake, M. (2019). Necklace-Shaped Dimethylsiloxane Polymers Bearing Polyhedral Oligomeric Silsesquioxane Cages as a New Type of Organic–Inorganic Hybrid. In: Chujo, Y. (eds) New Polymeric Materials Based on Element-Blocks. Springer, Singapore. https://doi.org/10.1007/978-981-13-2889-3_8

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