Abstract
The viscous flow transition of triblock copolymer styrene-isoprene-styrene (SIS5562) was studied by rheological methods. A broad loss factor (tan $$\delta$$ ) peak at 152.5 ℃ appeared on the dynamic viscoelastic spectrum under experimental conditions. Some similar peaks had been attributed to order-order transition (OOT) or order-disorder transition (ODT) in some research. In this system, the SAXS, time-temperature superposition (TTS) and Han plots proved that the microstructure of the SIS5562 did not undergo OOT or ODT transition in the temperature range. It may be the viscous flow transition as we supposed previously. The rheology study by capillary and rotation rheometer verified that the viscous flow transition temperature (Tf) was around 150 ℃.
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