S1 Supporting Information for Borazine-based inorganic–organic hybrid cyclomatrix microspheres by silicon/boron exchange precipitation polycondensation Nicolas A. Riensch, a Ayse Deniz, b Sebastian Kühl, b Lars Müller, a Alina Adams, c Andrij Pich* b and Holger Helten* a a. Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany Email: holger.helten@ac.rwth-aachen.de b. DWI – Leibniz Institute for Interactive Materials, Forckenbeckstraße 50, 52056 Aachen, Germany Email: pich@dwi.rwth-aachen.de c. Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52056 Aachen, Germany Content Experimental Section General procedures Syntheses FESEM Images of 3a, 3b and 3c IR of 3a, 3b and 3c DLS of 3c TGA of 3b and 3c NMR spectra References Electronic Supplementary Material (ESI) for Polymer Chemistry. This journal is © The Royal Society of Chemistry 2017