Polymer , generally casting process

Several approaches have been developed to fabricate honeycomb porous films [61] (see Fig. 10.3). The most extended approach involves a casting process of polymer solution droplet on a solid support controlling the relative humidity of the chamber (i). In general, at least relative humidity (RH) higher than 50 % is necessary to induce the water condensation and produce highly ordered structures. 

In general, due to the strong immiscibility of macromolecular blends, polymer mixtures demix during the rapid solvent-casting process thus leading to different surface structures [14,15,76,77]. The final surface structure depends on the spin-casting solvent [34], the blend [29,37,48,41,78-83] and polymer chemical composition [80], the polymer-polymer [6,14,30,35,80] and polymer-substrate [34,35,37,82,84,85] interactions in the formation of the domain structures [15,86], the thickness of the film [34,87-90], (e) tanperature [91] and (f) the evolution of the spin-cast structures toward... 

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