Studies of relaxation phenomena in polymers. IV. Superimposed transition mechanisms in polymethacrylates

摘要

AbstractThe existence of superimposed transition mechanisms in the “Tgregion” of polymethacrylates has been indicated by several authors including Ferry and co‐workers, who also have tried to separate the mechanisms. Using the general properties of the viscoelastic function logJ2=gα{logJ1} and a simple weighting model, the α‐and β‐mechanisms have been separated. The viscoelastic function logJ2=gβ{logJ1} is determined and is found to coincide both where different polymethacrylates are concerned and for the calculated as well as the directly