Abstract
The association of a monodisperse poly(ethylene oxide) 53 ethylene oxide units long and labeled at one end with pyrene (Py-PEO) was monitored as a function of Py-PEO concentration by steady-state and time-resolved fluorescence, surface tension, static (SLS), and dynamic (DLS) light scattering. The excimer fluorescence decays exhibit no rise time for any polymer concentration investigated in this study (>0.5 g/L), indicating that pyrene aggregates are present in solution and confirming the existence of Py-PEO micelles. No excimer emission could be detected for Py-PEO concentration smaller than 0.1 g/L. The first critical aggregation concentration (CAC1) for the formation of Py-PEO micelles was estimated to equal 0.003 g/L by SLS. The Py-PEO micelles are surface active above a Py-PEO concentration larger than 0.001 g/L (0.4 μM) where a clear drop in surface tension is observed at concentrations slightly lower than CAC1. At a Py-PEO concentration of 10 g/L, the surface tension plateaus due to the aggregation...
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