Photophysical evaluation of synergism from critical micelle temperature of mixed triblock polymer micelles

The critical micelle temperatures (cmt) of binary mixtures of triblock polymer (TBP) of poly(ethylene oxide) block poly(propylene oxide) block poly(ethylene oxide) (L64, P103, P84, P104) with different PPO/PEO ratios were determined employing the fluorescence measurements. The photophysical properties of pyrene due to its quenching as well as excimer formation in the interior of the mixed TBP micelles were studied and explained on the basis of stability of the mixed micelles. It was observed that the mixed micelle formation between the unlike components of P103 + L64 and P103 + P84 mixtures formed due to the attractive interactions and which raised from the mutual compatible arrangement among the unlike TBP monomers in the mixed state so as to minimize the steric hindrances. The results were fully supported by the viscosity measurements.