Abstract: The rheological behavior of poly(methyl methacrylate)/styrene maleic anhydride copolymer(PMMA/SMA) was investigated, where the effects of content of maleic anhydride(MA) on the timetemperature superposition (TTS) and the temperature dependency in PMMA/SMA were discussed. It indicated that for PMMA/SMA12 with 12 % MA in SMA, TTS was valid and there were positive deviations in the loglinear relation between relaxation time and composition at lower temperature, while the positive deviation became weaker with the rising of temperature and negative deviation occurred in some compositions. For PMMA/SMA28, TTS failed due to the dynamic asymmetry, where the relaxation time and the composition followed a loglinear relation at lower temperature while positive deviation occurred at higher temperature.

Key words: relaxation time, poly(methyl methacrylate), styrene maleic anhydride copolymer, rheological behavior, timetemperature superposition