

FOLLOWUS
a.Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
b.Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
c.University of Chinese Academy of Sciences, Beijing 100049, China
Zhi-da Wang (王志达), E-mail:wangzd@ms.giec.ac.cn
Received:13 September 2016,
Revised:2016-10-10,
Accepted:11 October 2016,
Published:2017-05
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Zhi-da Wang, Chang-feng Yan, Ying Huang, et al. Dependence of Size and Morphology on Shear Flow for PS-based Amphiphilic Block Copolymer Micelles in Aqueous Solution[J]. Chinese Journal of Polymer Science, 2017, 35(5): 641-648.
Zhi-da Wang, Chang-feng Yan, Ying Huang, et al. Dependence of Size and Morphology on Shear Flow for PS-based Amphiphilic Block Copolymer Micelles in Aqueous Solution[J]. Chinese Journal of Polymer Science, 2017, 35(5): 641-648. DOI: 10.1007/s10118-017-1927-4.
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-upaggregation 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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