Secondary crystallization from SAXS

Fig. 25 Annealing time evolution of the difference SAXS intensity in the induction period (a) and the crystallization period (b) for the melt crystallization of PET at 244 °C [18]. This system corresponds to crystallization from the metastable state where a nucle-ation and growth type of primary phase separation first occurs followed by the spinodal decomposition type secondary phase separation...

Detailed insight into the nature of such secondary crystallization processes comes from small angle X-ray scattering experiments. In Fig. 5.14 a series of SAXS curves was presented for a sample of linear polyethylene at the end... 

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