Abstract
AbstractBlends of poly(methyl methacrylate) (PMMA) and polystyrene (PS) have been investigated by differential scanning calorimetry and scanning electron microscopy. Blends were made of a low molecular weight PS with three PMMAs having number‐average molecular weights of (1) 18,300, (2) 37,000, and (3) 211,000, The blend was found to be partially miscible. The composition‐dependent values of the polymer‐polymer interaction parameter (g12) were determined and found to be from 0.015 to 0.029 for solution casting at 25°C. The interaction parameter (g12) increases with increasing PMMA molecular weights in the PMMA/PS blend systems. This result is consistent with the behavior of the glass transition temperatures and with the microscopy study which indicate that compatibility is greater in the PMMA‐1/PS blends having the low molecular weight of PMMA than in the PMMA‐3/PS blends having the higher molecular weights of PMMA.
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