The Micellization of Well-Defined Single Graft Copolymers in Block Copolymer/Homopolymer Blends
Anastasiadis, Spiros H.
KAUST DepartmentChemical Science Program
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Biological and Environmental Sciences and Engineering (BESE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/668038
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AbstractA 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.
CitationPavlopoulou, E., Chrissopoulou, K., Pispas, S., Hadjichristidis, N., & Anastasiadis, S. H. (2021). The Micellization of Well-Defined Single Graft Copolymers in Block Copolymer/Homopolymer Blends. Polymers, 13(5), 833. doi:10.3390/polym13050833
SponsorsThe authors acknowledge J. W. Mays and K. Hong for the synthesis and the kind donation of the linear diblock copolymers and the polyisoprene homopolymer. The Netherlands Organisation for Scientific Research (NWO) and ESRF are acknowledged for allocating beam time at the Dutch—Belgian beamline (DUBBLE) for the SAXS experiments. All DUBBLE members and in particular Giuseppe Portale and Wim Bras are warmly acknowledged for their support.
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