Refractive indices for various co-polymer mixtures of styrene, acrylonitrile, and methyl methacrylate

We have previously reported on the IR spectra of styrene, acrylonitrile, and methyl methacrylate (known as the SAN co-polymer), as well as the glass transitions. Not too much work on the refractive indices has been performed, and the refractive indices for a variety of these mixtures and some selected TEM pictures will be presented in this note.