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Polymers 2018, 10(4), 458;

Synthesis of Polystyrene Particles with Precisely Controlled Degree of Concaveness

Centre for Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, Suzhou 215006, China
State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
Author to whom correspondence should be addressed.
Received: 7 March 2018 / Revised: 16 April 2018 / Accepted: 17 April 2018 / Published: 21 April 2018
(This article belongs to the Special Issue Precision Polymer Synthesis)
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Shape is an essential property of polymeric particles. Herein, we propose a simple method to synthesize polymeric particles with a well-controlled concave shape. Our method takes advantage of the powerful seeded emulsion polymerization strategy with the well-known principle of “like dissolves like” in solvent chemistry. We first prepared polystyrene (PS) particles with a single dimple by seeded emulsion polymerization. Then the dimpled PS particles were dispersed in a dimethylformamide (DMF) and water mixture. Consequently, the non-crosslinked polymer chains inside the particle were dissolved by DMF, a good solvent for PS, and the PS chains migrated out of the particle, causing buckling of the dimple and enlargement of the concave. By systematic change of the fraction of DMF in the solvent mixture, we changed the amount of the dissolved PS chains, and achieved polymeric particles with precisely tuned degree of concaveness. These concave particles were found to readily self-assemble, driven by polymer-induced depletion interaction. The concave PS particles reported here provide potential building blocks for self-assembled polymeric materials, and new model systems for condensed matter research. View Full-Text
Keywords: concave particle; seeded emulsion polymerization; good solvent; buckling; self-assembly; depletion interaction concave particle; seeded emulsion polymerization; good solvent; buckling; self-assembly; depletion interaction

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Jing, W.; Du, S.; Zhang, Z. Synthesis of Polystyrene Particles with Precisely Controlled Degree of Concaveness. Polymers 2018, 10, 458.

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