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Article

The Micellization of Well-Defined Single Graft Copolymers in Block Copolymer/Homopolymer Blends

1
Institute of Electronic Structure and Laser, Foundation for Research and Technology—Hellas, P.O. Box 1527, 71110 Heraklion Crete, Greece
2
Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave., 11635 Athens, Greece
3
Department of Chemistry, University of Athens, 15771 Athens, Greece
4
Polymer Synthesis Laboratory, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
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Department of Chemistry, University of Crete, 71003 Heraklion Crete, Greece
*
Authors to whom correspondence should be addressed.
Academic Editor: Oleg V. Borisov
Polymers 2021, 13(5), 833; https://doi.org/10.3390/polym13050833
Received: 9 February 2021 / Revised: 25 February 2021 / Accepted: 5 March 2021 / Published: 9 March 2021
(This article belongs to the Special Issue Self-Assembly of Block Copolymers: Experiment and Modelling)
A series of well-defined (polyisoprene)2(polystyrene), I2S, single graft copolymers with similar total molecular weights but different compositions, fPS, were blended with a low molecular weight polyisoprene homopolymer matrix at a constant concentration 2 wt%, and the micellar characteristics were studied by small-angle x-ray scattering. To investigate the effect of macromolecular architecture on the formation and characteristics of micelles, the results on the single graft copolymers were compared with those of the corresponding linear polystyrene-b-polyisoprene diblock copolymers, SI. The comparison reveals that the polystyrene core chains are more stretched in the case of graft copolymer micelles. Stretching turned out to be purely a result of the architecture due to the second polyisoprene block in the corona. The micellization of a (polystyrene)2(polyisoprene), S2I, graft copolymer was also studied, and the comparison with the results of the corresponding I2S and SI copolymers emphasizes the need for a critical core volume rather than a critical length of the core-forming block, in order to have stable micelles. Finally, the absence of micellization in the case of the I2S copolymer with the highest polystyrene volume fraction is discussed. For this sample, macrophase separation occurs, with polyisoprene cylinders formed in the copolymer-rich domains of the phase-separated blends. View Full-Text
Keywords: block copolymers; micellization; single graft copolymers; small angle X-ray scattering; self-assembly block copolymers; micellization; single graft copolymers; small angle X-ray scattering; self-assembly
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MDPI and ACS Style

Pavlopoulou, E.; Chrissopoulou, K.; Pispas, S.; Hadjichristidis, N.; Anastasiadis, S.H. The Micellization of Well-Defined Single Graft Copolymers in Block Copolymer/Homopolymer Blends. Polymers 2021, 13, 833. https://doi.org/10.3390/polym13050833

AMA Style

Pavlopoulou E, Chrissopoulou K, Pispas S, Hadjichristidis N, Anastasiadis SH. The Micellization of Well-Defined Single Graft Copolymers in Block Copolymer/Homopolymer Blends. Polymers. 2021; 13(5):833. https://doi.org/10.3390/polym13050833

Chicago/Turabian Style

Pavlopoulou, Eleni, Kiriaki Chrissopoulou, Stergios Pispas, Nikos Hadjichristidis, and Spiros H. Anastasiadis 2021. "The Micellization of Well-Defined Single Graft Copolymers in Block Copolymer/Homopolymer Blends" Polymers 13, no. 5: 833. https://doi.org/10.3390/polym13050833

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