Abstract
Two cationic polymers with similar composition were prepared by two different polymerization methods. By monitoring the evolution of the molar mass and chemical composition during the reactions together with charge density measurements and calculations, it was concluded that the cationic polymer synthesized by emulsion polymerization had a less uniform compositional distribution than the cationic polymer prepared by solution polymerization. Contributing to the heterogeneity was the hydrolysis of one monomer (dimethylamino ethylmethacrylate (DMAEMA)) during the synthesis. As a result, the polymer prepared by emulsion polymerization had a more blocky structure and was more surface active as supported by static and dynamic surface tensions data. Fluorescence experiments showed that both polymers formed aggregates at very low concentrations of approximately 0.01 wt%. The aggregates of the polymer prepared by emulsion polymerization were compact, whereas the solution polymerization-based polymer aggregates exhibited a rather expanded geometry.
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Acknowledgments
The authors would like to thank Pascal van den Thillart for the synthesis, Paul Cools and Ton Brooijmans for the GPC and GPEC measurements, Li Feng for the SLS measurements and interpretation, and finally Remco Tuinier and Mark Boerakker for the valuable discussions and carefully reading the manuscript. The authors would also like to thank DSM for the permission to publish this work.
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Figures S1
Left: typical drop shape of pendant drop of water in cyclohexane. Right: drop shape of pendant drop 1.7 wt% aqueous solution of polymer A in cyclohexane (DOCX 286 kb)
Figure S2
The fluorescence response (arbitrary units) of aqueous dilutions of polymer A and polymer S, using fluorescent probe molecule Nile Red. Extinction was set at 520 nm and the emission responsible at 583 nm is plotted (DOCX 52 kb)
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Scheerder, J., Langermans, H. The synthesis, interfacial, and colloidal properties of waterborne cationic methacrylic co-polymers. Colloid Polym Sci 292, 991–1001 (2014). https://doi.org/10.1007/s00396-014-3176-1
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DOI: https://doi.org/10.1007/s00396-014-3176-1