Miscibility Studies in Blends of Poly(methyl methacrylate) with Poly(styrene-co-methacrylonitrile) Using Solid-State NMR and Fluorescence Spectroscopy

Abstract

The miscibility in blends of poly(methyl methacrylate) (PMMA) with poly(styrene-co-methacrylonitrile) (SMAN) was examined by solid-state NMR and fluorescence spectroscopy. The value of the excimer/monomer fluorescence intensity (IB/IM) in the blends provides a sensitive measure of phase separation. A miscibility window in the blends of PMMA and SMAN containing about 30-65 mol % methacrylonitrile (MAN) monomer has been observed by fluorescence experiments. Measurements of T1pH by solid-state NMR have shown that blends containing 50:50 wt % PMMA blended with each of polystyrene, poly (methacrylonitrile), SMAN (MAN: 18.9 mol %), and SMAN (MAN: 87.6 mol %) are phase-separated. There is an interm..