Glassy region state

If one needs an estimate of the polymer volume in a polymer-solvent solution below the glass transition temperature it may be better to extrapolate using the liquid volume constants. No extensive testing of this hypothesis has been done, however. For the pure polymer in the glassy region, Tait constants for the glassy state should be used. (Zoller, 1989.)... 

It should be noted that polycarbonate has a strong beta transition near -100 C. The polymers least mobile state is, therefore, below the beta transition. Further experimentation, not included here, indicates that below the beta transition the magnitude of E" and tan 8 are far less frequency dependent than above the transition. The poor fit seen in the "glassy" region of Figure 6 appears to be due to the presence of the beta transition. The difference in activation energies for the a and P transitions result in tan 8 having a more complex frequency dependence in the... 

Pace and Datyner ( 5, 5) have also proposed a model for the absorption (solution) of small molecules in polymers applicable at temperatures above and below Tg, which incorporates the dual-mode sorption model for the glassy region. The presence of microvoids is assumed for rubbery polymers as well as for polymer glasses. "Hole filling" is suggested as an important sorption mode above as well as below Tg, with one crucial difference between the sorption mechanism in the rubbery and glassy regions hole saturation does not occur in the rubbery state because new microvoids are formed to replace those filled with penetrant molecules. 

Fig. 4 Stability diagram of polyelectrolyte complexes as a function of the ionic strength for systems where (a) t rj Texp and (b) t > texp- On the horizontal axis is the composition of the mixture given. On the vertical axis is the salt concentration (Csan). The L region indicates a liquid state, and the G region the glassy (quenched) state S indicates soluble polyelectrolyte complexes. In the N region, no complexation occurs [1]. (a) is a slight modification of the diagram proposed by Kovacevic et al. [31]...

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