Journal
PROCESSES
Volume 9, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/pr9101820
Keywords
silica nanoparticles; Pickering emulsion polymerization; microspheres; hybrid monoliths
Categories
Funding
- CONACyT [CB-2014-240160]
- UNAM, DGAPA [PAPIIT IN112221]
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Polymerizations of styrene were performed in Pickering emulsions using DVB and VBS, resulting in polydisperse spheroid copolymer nanoparticles and microspheres with core-shell structures; adjusting the pH and DVB content in the emulsions could control the final morphology of the products; this work presents a new strategy for preparing hybrid percolated scaffolds with bi-continuous porosity using Pickering emulsion polymerization.
In this work, polymerizations of styrene (St) in the presence of divinylbenzene (DVB) as a crosslinking agent and sodium 4-vinylbenzenesulfonate (VBS) have been performed in Pickering emulsions, using silica nanoparticles (SNps) as stabilizing agents and ammonium persulfate as a hydrophilic initiator. In oil-in-water Pickering emulsions with alkaline continuous phase (pH = 9) at 1, 2, and 3 wt% DVB (relative to St), polydisperse spheroid copolymer submicronic nanoparticles were obtained. Comparatively, polymerizations performed in Pickering emulsions with acidic continuous phase (pH = 5) allowed preparing St-co-DVB microspheres with core-shell structures at 1 wt% DVB and St-co-DVB hybrid monoliths with bi-continuous morphologies at 2 and 3 wt% DVB. It is noteworthy that this work reports Pickering emulsion polymerization as a new strategy for preparing hybrid percolated scaffolds with bi-continuous porosity. The proposed mechanisms originated by pH, DVB, and VBS and the drastic impact caused on the final morphology obtained, either hybrid particles or monoliths, are discussed herein.
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