In-situ steady-state fluorescence (SSF) measurements were performed for studying diffusion processes of pyrene end-capped polystyrene (Py-PSt) in gels formed by free radical cross- linking copolymerization (FCC) of styrene (St) and ethylene glycol dimethacrylate (EGDM) in toluene solutions. The pyrene end-capped polystyrene was prepared by atom transfer radical polymerization (ATRP). The process involves the synthesis of 1-pyrenylmethyl 2- ...