Polystyrene glass transition temperature, molar

Figure 1.1. Calculation of glass transition temperature Tg and density p at room temperature of polystyrene as an example of the application of group contribution techniques, (a) The structure of a polystyrene repeat unit, (b) Fonnal breakdown of this structure into two "groups", (c) Each group makes a contribution to the molecular weight M of the repeat unit, to the "molar glass transition function" Yg, and to the amorphous molar volume V [3a], M, Yg and V arc sums of these contributions ...

A rather specialized solid-state carbonation procedure can be used to carbonate PSLi and other living polymers with backbones which have glass transition temperatures significantly above room temperature. Thus, freeze-drying of benzene solutions of PSLi generates a porous solid which can be carbonated in the solid state to give minimal amounts of dimeric ketone products (1-2%). In addition, essentially quantitative yields of carboxylated polystyrene were obtained from freeze-dried solutions of PSLi that were complexed with 1-2 molar equivalents of TMEDA. No dimer was detected by SEC or TLC analyses. A freeze-dried sample of poly... 

Figure 13.11 Glass transition temperature of atactic polystyrene as a function of the reciprocal of the molar mass.

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