Two-dimensional Raman-near infrared heterospectral correlation spectroscopy studies of the specific interactions in partially miscible blends of poly(methyl methacrylate) and poly(4-vinylphenol)

Fourier-transform (FT) Raman and near infrared (NIR) spectra have been measured for poly(methyl methacrylate) (PMMA) and its partially miscible blends with poly(4-vinylphenol) (PVPh) of contents from 1 to 10 wt%. Generalized two-dimensional (2D) correlation spectroscopy has been applied to analyze the composition-dependent FT-Raman and NIR spectral variations of the blends. The Raman-NIR hetero-correlation analysis detects a band at 1706 cm−1 for the hydrogen-bonded C=O of PMMA and a band at 6764 cm−1 for the hydrogen-bonded O–H of PVPh. The two bands are involved in the specific interaction between PMMA and PVPh that is responsible for the partial miscibility of the blends.