Abstract
Compatibilization of an immiscible polymer pair, polystyrene and poly(ethyl methacrylate), is achieved by introducing along the polymer chains cinnamic acid and 2-dimethylaminoethyl methacrylate groups, respectively. The miscibility behavior of a series of poly[styrene-co-(cinnamic acid)] (PSCA) copolymers containing 5, 8, and 23 mol-% of acidic units, with poly[(ethyl methacrylate)-co-(2-dimethylaminoethyl methacrylate)] (PEMADAE) was investigated by DSC and FTIR. Based on the single composition-dependent glass transition criterion, each PSCA copolymer is miscible with PEMADAE over the three blend compositions studied. The glass transition temperatures are higher than predicted according to the additivity principle. This indicates the occurrence of strong intermolecular interactions between the polymeric chains of the two components. The T g -composition curves of the investigated systems are interpreted according to the Kwei and the Schneider approaches. The results of the FTIR study reveal that the changes detected in the carbonyl stretching frequency region are the consequence of hydrogen bonding between the carboxylic acid groups in PSCA and the carbonyl groups in PEMADAE.
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