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The solute dynamics in a symmetrical poly (ethylene oxide)-poly (propylene oxide)-poly (ethylene oxide) (PEO-PPO-PEO) triblock copolymer, P-123 were studied in aqueous and saline solutions as a function of additives, temperature using spectroscopic techniques. We have chosen a hydrophobic solute Coumarin-6 (C-6) as probe to study the photophysics and rotational dynamics in the above systems. We found that the rotational dynamics of C-6 is hindered in saline solution compared to that in aqueous solution of P-123. Therefore, in the saline solution of P-123, C-6 faced more restricted environment compared to the aqueous solution of P-123. In the absence of saline, at a temperature higher than cmt, we observed that addition of 0.02 M n-hexanol decreases the rotational relaxation time compared to that in P-123. Whereas, addition of 0.02 M n-hexylamine the rotational relaxation remains almost same compared to that in P-123. Therefore, n-hexanol affect more on the solute dynamics compared to n-hexylamine because of its preferential partitioning in the micellar phase owing to its greater hydrophobic ranking compared to n-hexylamine. In the saline solution we observed that addition of 0.02 M n-hexanol on P-123 solution affect more on the rotational dynamics of C-6 compared to the addition of 0.02 M n-hexylamine.

Solute dynamics in a block copolymer: effect of additives and temperature