Macroporous microspheres and microspheroidal particles from polyhydromethylsiloxane
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Polysiloxane macroporous microspheres and macroporous spheroidal particles were generated from a linear siloxane polymer using a simple emulsion procedure. Osmotic pressure produced by nano-dispersed ionic salt solution in polysiloxane droplets formed in aqueous emulsion is proposed as a mechanism of macropore formation. The competition between cross-linking of the polymer and osmotic swelling of the microspheres governs the shape and porosity of the particles which were characterized by SEM, 29Si MAS NMR, mercury intrusion porosimetry, and X-ray computed tomography.
KeywordsMacroporous microspheres Polysiloxane microspheres Spheroidal particles Polyhydromethylsiloxane Macroporous particles
The financial support from the National Science Centre (NCN), grant 2013/11/B/ST5/01615, is highly appreciated. Micro-CT scans were performed in the NanoFun laboratory co-financed by the European Regional Development Fund within the Innovation Economy Operational Program POIG.02.02.00-00-025/09 (help of K. Janiszewska is greatly appreciated).
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Conflict of interest
The authors declare that they have no conflict of interest.