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• Li, J
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• Rehahn, M
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Polymers 2013, 5(1), 284-302; doi:10.3390/polym5010284

Article

Immobilization of Poly(1,1-dimethysilacyclobutane) by Means of Anionic Ring-Opening Polymerization on Organic Nanoparticles and Reinvestigation of Crystallization

Markus Gallei ^1,* , Junyu Li ² , Johannes Elbert ¹ , Markus Mazurowski ¹ , Astrid Schönberger ¹ , Christian Schmidt ¹ , Bernd Stühn ^2,*  and Matthias Rehahn ¹

¹ Ernst-Berl Institute for Chemical Engineering and Macromolecular Science, Darmstadt University of Technology, Petersenstraße 22, D-64287 Darmstadt, Germany ² Institute of Condensed Matter Physics, Darmstadt University of Technology, Hochschulstraße 8, D-64289 Darmstadt, Germany

* Authors to whom correspondence should be addressed.

Received: 30 January 2013; in revised form: 28 February 2013 / Accepted: 5 March 2013 / Published: 15 March 2013

(This article belongs to the Special Issue Ring-Opening Polymerization)

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Abstract: In the present study, the synthesis of poly(1,1-dimethylsilacyclobutane) (PDMSB) by anionic ring opening polymerization (ROP) is reinvestigated, leading to narrowly distributed molar masses (polydispersities 1.04–1.15) in the range of 2.3 to 60 kg mol⁻¹. Investigations of thermal behavior for low molar mass PDMSB revealed an untypical multiple peaks melting phenomenon, which at first glance, seems to be of the same origin as low molar mass poly(ethylene oxide)s. Small angle X-ray scattering (SAXS) and X-ray diffraction (XRD) measurements are done, proving the fast crystallization and subsequent recrystallization for investigated low molar mass samples. Synthetic attempts are expanded to the surface-initiated anionic ROP of 1,1-dimethylsilacyclobutane (DMSB) monomer from the surface of cross-linked polystyrene (PS) nanoparticles. Novel polycarbosilanes (PCS)/organic core/shell particles are obtained, which are investigated by using transmission electron microscopy (TEM) and dynamic light scattering (DLS) experiments. First insights into the crystallization behavior of surface-attached PDMSB chains reveal that crystallization seems to be hindered.

Keywords: polycarbosilanes; anionic polymerizations; crystallization; nanoparticles; surface-attached polymers

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