Secondary relaxation temperature

In addition to Tg (amorphous phases) and the melting temperature Tm (crystalline phases), polymers also manifest secondary relaxations at temperatures below those of major relaxations (Tg or Tm, which will collectively be referred to as T. The main secondary relaxation temperature wil be designated generically as Tp, although it may be labeled differently in the literature on specific polymers. For example, it is commonly labeled as Ty for bisphenol-A polycarbonate where Ty is for a relaxation of higher intensity than Tp, and occurring at a lower temperature, which is the main secondary relaxation of this particular polymer. 

Glass-transition and secondary-relaxation temperatures and associated activation energy values of (Torlon)( 5 >... 

TABLE 13.1. Glass-transition and secondary-relaxation temperatures ofpoly(alkyl acrylates) andpoly(alkyl methacrylates). 

TABLE 13.5. Glass-transitlon and secondary-relaxation temperatures of polystyrenes. 

Secondary-relaxation temperatures of poly(pyromellitimide-l,4-diphenyl ether)... 

Table 4.6 Secondary relaxation temperatures ( C) of the blends and homopolymers of PEI and nylon 66 [the numerals in the sample column indicate the PEI content (%))...

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