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Issue 18, 2015
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Surface morphology control of cross-linked polymer particles via dispersion polymerization

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Abstract

Cross-linked polymer colloids (poly(methyl methacrylate) and polystyrene) with diverse shapes were prepared in polar solvents (ethanol, methanol and water) via dispersion polymerization, in which a linear addition of the cross-linker was used during reaction. Apart from spherical particles we found dented spheres or particles covered with nodules, or a combination of both. A comprehensive investigation was carried out, mainly concentrating on the effect of the experimental conditions (e.g., the addition start time and total addition time, cross-linker density and the solvency of the solvents) on particle morphologies. Consequently, we suggest a number of effective ways for the synthesis of regular (spherical) colloidal particles through maintaining a relatively low concentration of the cross-linker during the entire reaction, or forcing the co-polymerization (of monomer and cross-linker) locus to the continuous medium, or using a high quality or quantity of the stabilizer. Moreover, the size of the particles was also precisely manipulated by varying the polarity of the solvents, the concentration of the cross-linker, and the amount and average molecular weight of the stabilizer. In addition, the formation of the heavily dented particles with a very rough surface prepared under a pure or oxygen-‘contaminated’ nitrogen environment was monitored over time. The results accumulated in this article are of use for a better understanding of the mechanism of the polymerization and control over the structure and property of polymer particles.

Graphical abstract: Surface morphology control of cross-linked polymer particles via dispersion polymerization

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Article information


Submitted
13 Mar 2015
Accepted
16 Mar 2015
First published
16 Mar 2015

Soft Matter, 2015,11, 3589-3598
Article type
Paper

Surface morphology control of cross-linked polymer particles via dispersion polymerization

B. Peng and A. Imhof, Soft Matter, 2015, 11, 3589
DOI: 10.1039/C5SM00606F

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