Behavior on Temperature and Pressure

Until now, there has been no explicit discussion of the effect of temperature oi pressure on any of the viscoelastic functions, although it has been mentioned thai below the glass transition temperature the configurations of polymer chain backbones are largely immobilized and the tremendous changes in viscoelastic properties with time or frequency which characterize polymeric systems do not appear (curves V in the figures in Chapter 2). 

It is in the transition zone between glasslike and rubberlike consistency that the dependence of viscoelastic functions on temperature is most spectacular, just as is the dependence on time or frequency. An example is given in Fig. 11-1 for the real part of the complex compliance of poly(/t-octyl methacrylate). Below —5°C, the experimental frequency range appears to correspond to the glassy zone the compliance is quite low, around 10 - cm dyne Pa ), and does not change 

Storage compliance of poly(n-octyl methacrylate) in the transition zone between glasslike and rubberlike consistency, plotted logarithmically against frequency at 24 temperatures as indicated. 

Any attempt to analyze the temperature dependence by seeking an analytical 

It turns out that the effects of static confining pressure on the viscoelastic properties can be described by reduced variables and interpreted on a molecular basis in a similar manner. 

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