The empirical principle of time-temperature superposition has been found to fail for a miscible blend of 20 weight% poly(ethylene oxide) in poly(methyl methacrylate). Oscillatory shear rheometry data is reported for this blend at four temperatures well above the glass transition temperature of the blend. The longest relaxation time of each component in the blend is obtained from the frequency dependence of the loss modulus. The temperature dependence of the longest relaxation time of each component in the blend is found to obey the empirical WLF equation of the pure component referenced to the glass transition temperature of the blend.
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry