Abstract
Asymmetric diblock copolymers of styrene (St) and sulfonated isoprene (SI) with a short St block and a much longer SI block were synthesized by sulfonation of diblock copolymers of St and isoprene, and their micellization in aqueous solution was investigated. Three block copolymers having different degrees of polymerization of St block (DPSt) and SI block (DPSI) were employed, which include polymers with DPSt = 40 and DPSI = 240 (St−SI-20), DPSt = 60 and DPSI = 210 (St−SI-30), and DPSt = 130 and DPSI = 820 (St−SI-207). Dry samples of these St−SI block copolymers could be directly dissolved in water, undergoing intermolecular self-association to form core−corona type micelles. The micellar mass, hydrodynamic size and its distribution, critical micelle concentration (cmc), and aggregation number were estimated by light scattering and fluorescence techniques. It was suggested that the micelles and unimers coexist at equilibrium with a well-defined cmc on the order of 10-2 g/L, with St−SI-207 (with the longes...
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