Ionomer peak intensity

A similar analysis was conducted by Fujimura et al. on cesium-neutralized Nafion with orientations up to Ab = 1.5 (where Ab is the ratio of the final extended length to the initial undrawn length). Over a range of orientations, the ionomer peak was observed to shift to lower angles and decrease in intensity in the meridional (draw) direction, while a shift to higher angles and an increase in intensity... 

Scattering data over the extended range of q-space were also collected from Nafion samples containing a wide range of water contents = 0.05—0.84). While systematic shifts in the intensities and positions of the structure maxima (i.e., the crystalline and ionomer peaks) were observed and consistent with those found by others, the general shapes of the scattering profiles for all samples were quite similar. This observation supported the assumption that the swelling process simply involves a dilution of the... 

Tn the case of nonpolar diluents, very few studies have appeared in the literature. The Zn sulfonated polystyrene plasticized by 3.4 wt. % dodecane shows no change in either position, intensity or shape of the ionomer peak compared to that of the bulk polymer (27) this was taken to indicate that the ionic microphase is unaffected by this diluent. The Mn sulfonated polystyrene plasticized b,v up to 10 wt % DOP (Figure 11) shows a decrease in intensity of the peak, but no change in its shape or position (28). This was explained as a dilution effect of the ionic phase due to swelling of the matrix by the plasticizer. 

Fig. 11.15 Left-. A schematic representation of the fully hydrated morphology of a PFSA ionomer (e.g., Nafion) under the assumptions of a cubic lattice model which fitted data from small angle X-ray scattering (SAXS) experiments. Right. SAXS spectra of hydrated Nafion and a hydrated sulfonated polyetherketone. The characteristic hydrophobic/hydrophilic separation lengths are obtained from the position of the ionomer peaks while the internal hydrophobic/hydrophilic interfaces are obtained from the intensities in the Porod regime. First reported in Ref. [66]...

Amorphous PC exhibits short-range order, which is evident from a WANS peak at q, = 1.27 A. In two-phase blends of PC with eithw polystyrene or sulfonated polystyrene ionomers, the short-range order is retained by the PC. However, in the one-phase region, the PC order is diminished, as evident from a reduction in the WANS peak intensity and increase in the peak broadness. The reduction of the PC short-range order in the miscible blends is believed to result from the intimate mixing of the two polymers, which disrupts the parallel packing of PC chain segments with trans-trans conformations. 

The micro-SAXS experiments were conducted on membranes at different levels of hydration. On the contrary to the expected behavior, the ionomer peak does not shift as the water content increases when observed along the membrane thickness [158]. Two main effects are observed in the spectra upon swelling. First, the level of intensity increases at very large angles due to the filhng of the nanoporosity without any change in the local structure. This... 

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