Abstract
Inverse gas chromatography and small-amplitude oscillatory shear measurements were used to follow phase transition in poly (styrene-co-acrilonitrile)/poly-methylmethacryle (SAN/PMMA) blend with lower critical solution temperature (LCST). During phase segregation, the blend exhibited a shoulder in G' and in linear relaxation modulus G(t) in the low frequency/long time region. Phase transition was confirmed by both optical microscopy and inverse gas chromatography (IGC) analyses. The critical temperature of phase segregation and the Flory-interaction parameter at different temperatures were extracted from rheological data using the Palierne model, Bousmina model and Fredrickson-Larson model. The results were compared to those obtained from IGC measurements using n-alkane probes.
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