Mesophase forming samples characterization

Vittoria et al. [31,73] studied the permeability to dichloromethane vapors of hlms of SPS thermally crystallized from the amorphous phase in a form. Results showed that, for each degree of crystallinity, the fraction of impermeable phase is higher than the crystalline phase, at low vapor activity. Therefore, Vittoria and colleagues suggested that this was due to the presence of a mesomorphic phase, in addition to the crystalline and the amorphous. This mesophase, characterized by conformational order not sufficient to give rise to discrete X-ray reflections, is less permeable than the amorphous sample to the vapors at low activity and became permeable at higher activity (a > 0.6). 

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