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High molecular weight cyclic polysiloxanes from organocatalytic zwitterionic polymerization of constrained spirocyclosiloxanes

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Abstract

Cyclic polymers are macromolecules which exhibit interesting topological structures and unique properties. Cyclic polysiloxane formation by organic zwitterionic polymerization of cyclic siloxanes offers the advantage of a simple process, no metal residue and adjustable catalyst activity, but is retarded by the low strain energy of cyclosiloxanes. Herein, we demonstrate the design and synthesis of highly strained spiral cyclosiloxane molecules, and realized the first high molecular weight cyclic polysiloxane formation by zwitterionic polymerization. The cyclic morphology of the resulting polymer was unambiguously identified by NMR, AFM and FESEM, with the mechanism proved by DFT calculations. This research opens a new way of generating cyclic polysiloxanes with unique structural features.

Graphical abstract: High molecular weight cyclic polysiloxanes from organocatalytic zwitterionic polymerization of constrained spirocyclosiloxanes

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Publication details

The article was received on 04 Sep 2017, accepted on 05 Nov 2017 and first published on 08 Nov 2017


Article type: Communication
DOI: 10.1039/C7PY01499F
Citation: Polym. Chem., 2017, Advance Article
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    High molecular weight cyclic polysiloxanes from organocatalytic zwitterionic polymerization of constrained spirocyclosiloxanes

    C. Wu, J. Yu, Q. Li and Y. Liu, Polym. Chem., 2017, Advance Article , DOI: 10.1039/C7PY01499F

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