Abstract
This contribution focuses on the impact of shear flow on size and nanostructure of PS-based amphiphilic block copolymer (BC) micelles by varying the stirring rate and copolymer composition. The results show that the vesicles formed from diblock copolymer (di-BC) of PS-b-PAA remain with vesicular morphology, although the average size decreases, with the increase of stirring rate. However, the multi-compartment micelles (MCMs) formed from tri-block copolymer (tri-BC) of PS-b-P2VP-b-PEO are quite intricate, in which the copolymer first self-assembles into spheres, then to clusters, to large compound micelles (LCMs), and finally back to spheres, as stirring rate increases from 100 r/min to 2200 r/min. Formation mechanism studies manifest that vesicles form simultaneously as water is added to the di-BC solution, termed as directassembly, and remain with vesicular structure in the flowing process. While for the PS-b-P2VP-b-PEO copolymer, spherical micelles at initial stage can further assemble into clusters and LCMs, termed as second-assembly, due to the speeding-up-aggregation of the favorable stirring. As a result, an invert V-relationship between tri-BC micelle dimension and stirring rate is observed in contrast to the non-linear decreasing curve of di-BC vesicles. It is by investigating these various amphiphilic BCs that the understanding of shear dependence of size and morphology of micelles is improved from self-assembly to second-assembly process.
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This work was financially supported by the Key Laboratory of Renewable Energy Foundation of Chinese Academy of Sciences (No. Y609JK1001), the National Natural Science Foundation of China (No. 51576201), Natural Science Foundation of Guangdong province (Nos. 2015A030312007 and 2015A030313716), Guangdong Science and Technology Project (No. 2013B050800007), and Guangzhou Science and Technology Project (No. 2016201604030010).
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Wang, Zd., Yan, Cf., Huang, Y. et al. Dependence of size and morphology on shear flow for PS-based amphiphilic block copolymer micelles in aqueous solution. Chin J Polym Sci 35, 641–648 (2017). https://doi.org/10.1007/s10118-017-1927-4
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DOI: https://doi.org/10.1007/s10118-017-1927-4