Glass transition phenomena

It was found that Afi Tg and Aa Tg are not constant and therefore the SB equation has limited applicability. Hie results indicate an increase in Aa Te with increasing Tg. Therefore it is inadmissible to use the product A a Tg as a universal value in any theoretical discussion of the glass-transition phenomenon. At the same time, this conclusion in no way excludes the free-volume theory and the role of free-volume in the transition from the glassy to the liquid or rubberlike state. 

From a more fundamental point of view, the glass transition phenomenon has been explained using different types of physical models, as shown... 

The glass transition phenomenon has been presented in Chapter 4. Here, only structure-property relationships will be briefly examined. 

As a general comment about the dynamic mechanical relaxational behavior of this polymer, the results are consistent with dielectric data [210] and with the fact that no glass transition phenomenon is observed, at least in the range of temperature studied. This is striking in an amorphous polymer. It is likely that the residual part of the molecule mechanically active above the temperature of the ft relaxation is only a small one, and this is the reason for the low loss observed in the a zone. 

A comparative study of the kinetic and thermodynamic approaches to the glass transition phenomenon was made by Vijayakumar and Kothandaraman (1987). 

III. Some Comments on Theoretical Approaches to the Glass Transition Phenomenon... 

III. SOME COMMENTS ON THEORETICAL APPROACHES TO THE GLASS TRANSITION PHENOMENON... 

The glass transition phenomenon is an unsolved problem of condensed matter physics. Most approaches agree that the glass transition temperature Tg—though... 

Before we go into some details of MCT, we briefly mention that there exists another microscopic theory of the glass transition phenomenon, the replica theory [120,121], which is inspired by spin glass theory [122] and which lends some... 

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