In this study, styrene-maleic anhydride (SMA) copolymer was modified by monoesterification method with 9-(hydroxyrnethyl)anthracene fluorophore to prepare a fluorescent anthracene labeled SMA (SMA-An) material. The latter was then characterized by attenuated total reflection (ATR) and thermogravimetric analysis (TGA) techniques. In the second step of this work, SMA-An was added to SMA/[Styrene-Acrylonitrile Copolymer (SAN)] and SMA/[Poly(methyl methacrylate) (PMMA)] blends to investigate the miscibility of these blends at the molecular level. The miscibility of SMA/PMMA blends was characterized using fluorescence quenching of anthracene by the succinic anhydride and succinic acid functions on SMA macromolecule itself. (C) 2007 Wiley Periodicals, Inc.