Morphological evolution of aggregates induced by the hydrophobic effect and hydrogen bonding interaction |
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Authors: | Zhongli Lei Liang Zhang |
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Institution: | Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an 710062, China |
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Abstract: | The aggregation behavior of poly(ethylene oxide)-block-poly(methylmethacrylate) (PEO-b-PMMA) in toluene without and with the addition of polar small-molecules has been characterized using transmission electron microscopy (TEM). The preparation method involved copolymer dissolution in toluene which is a selective solvent for polymethylmethacrylate at room temperature, followed by the addition of polar small-molecules. By increasing polarity of the small-molecules at the same copolymer concentrations, these aggregates were found to undergo morphological transformations from spherical aggregates to multiple morphologies, including bean-pod liked structures (the morphologies are biomimetic), spheres and vesicles. A possible mechanism for the formation of this aggregate is proposed. |
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