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Re-assembly behaviors of block copolymer micelles on substrates: effects of block length and interaction force

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Abstract

The re-assembly behaviors of amphiphilic polystyrene-b-poly(acrylic acid) (PS-b-PAA) diblock copolymer micelles were investigated using dynamic light scattering, transmission electron microscopy, and atom force microscopy. PS-b-PAA diblock copolymer self-assembled into spherical micelles with PS as shell and PAA as core in toluene. The micelle size increased with the PS block length in polymers containing a constant length of PAA block. With the PS block length increased, spherical micelles re-assembled various distinguished morphologies such as clusters, large compound micelles (LCMs), rings, and ribbon-like aggregations. In addition, the interaction forces between PS and different substrates were directly measured in toluene to further investigate the mechanism. The results indicated that the re-assembly occurred easily when the interaction force was weak. Systematic studies suggested that the micellar re-assembly behaviors on a flat surface were strongly dependent on the block length and interaction between micelles and substrates. Delineation of these rules provides a novel pathway to the design of hierarchical materials.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 20634050, 20804053, 20174015, 21274007, 51021064), the Tribology Science Fund of State Key Laboratory of Tribology (SKLTKF12A10), and the Science and Technology Development Project of Beijing Municipal Commission of Education (Grant No. SQKM201610011001).

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Authors and Affiliations

  1. Department of Material Science and Engineering, Beijing Technology and Business University, Beijing, 100048, China

    Yang Zhang & Bianying Wen

  2. College of Chemistry, Beijing Normal University, Beijing, 100875, China

    Jianjun Zhou

  3. School of Environment, Beijing Normal University, Beijing, 100875, China

    Ying Yu

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  1. Yang Zhang
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  2. Jianjun Zhou
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  3. Ying Yu
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  4. Bianying Wen
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Correspondence to Yang Zhang.

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Zhang, Y., Zhou, J., Yu, Y. et al. Re-assembly behaviors of block copolymer micelles on substrates: effects of block length and interaction force. Colloid Polym Sci 294, 181–187 (2016). https://doi.org/10.1007/s00396-015-3761-y

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  • DOI: https://doi.org/10.1007/s00396-015-3761-y

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