Abstract
Polystyrene–polybutadiene (PS–SB) and polystyrene–polyisoprene (PS–PI) diblock copolymers form spherical micelles with PS cores and PB/PI corona in a PB/PI-selective solvent, n-tetradecae (C14). At high concentrations, the micelles are further arranged on bcc lattices. Structural factors governing the equilibrium modulus Ge of these PS–PB and PS–PI micellar lattices are discussed in this study. It turned out that Ge is primarily determined by the number density of the corona blocks νcorona and proportional to νcorona while the number density of the bcc lattice cell, D−3 with D being the lattice spacing (determined from SAXS), has only secondary effects on Ge. The proportionality between Ge and νcorona reflects the thermodynamic origin of the lattice elasticity, the entropic elasticity of the corona PB/PI blocks having osmotically correlated conformations. These results suggest a necessity of re-examination of a previous hypothesis that the cell number density primarily determines Ge of bulk copolymer systems forming cubic phases [Kossuth et al., J. Rheol., 43, 167 (1999)]. Furthermore, the Ge/νcorona ratio was found to be moderately different for the PS–PB/C14 and PS–PI/C14 micellar lattices. This difference can be related to a difference in the magnitude of the osmotic correlation for the PB and PI corona blocks due to a slight difference of their solubilities in C14.
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Tan, H., Watanabe, H. Further Investigation of Equilibrium Modulus of Diblock Copolymer Micellar Lattice. Polym J 36, 430–434 (2004). https://doi.org/10.1295/polymj.36.430
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DOI: https://doi.org/10.1295/polymj.36.430