Air Mercury International

Figure 1 Chemical structures of (A) polystyrene and (B) poly(methyl methacrylate) with the sidechain groups identified that are thought to be involved in glassy-state dynamical transitions (see Table 1).

Figure 1 Chemical structures of (A) polystyrene and (B) poly(methyl methacrylate) with the sidechain groups identified that are thought to be involved in glassy-state dynamical transitions (see Table 1).

and ester groups (Tp = 243-263 K) as well as a localized cooperative relaxation of the main chain (Ta = 318-348 K). It is a general characteristic of solid-state polymer transitions that they are often difficult to detect and may only be observable in certain physical measurements (may be detectable by mechanical but not spectroscopic or thermal methods, for example).

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