Abstract
Dynamic mechanical and thermal properties of compatible binary polymer blends were investigated by using a Rheovibron and a DSC. Injection molded specimens of polymer blends of styrene-acrylonitrile (SAN) and poly (methyl methacrylate) (PMMA) were used. The α-peak and some small peaks of dynamic loss modulus (E'') and tan δ of the blend specimens were overlapped. Heat-treatment of specimens was conducted at temperatures of 85° and 120°C. No phase separation between SAN and PMMA was found for the blend specimens that were heat-treated at 120°C, a temperature which was higher than the glass transition temperature (Tg) of the polymers. Dynamic storage modulus (E'') of the heat-treated blend specimens decreased below room temperature and increased above it. Tg measured by E'' for the blend specimens increased with increasing content of SAN and with increasing heat-treating temperature.
