Recrystallizations, guest-induced

Guest-Induced Recrystallizations The co-crystal formation by absorption of suitable guest molecules in the helical y phase as well as in the trans-planar a phase was described in early papers on SPS [42,89,91]. It has also been found that the denser trans-planar p phase presents a higher stability and it is not transformed into any co-crystalline phase by guest absorption [89,91]. 

Guest-induced recrystallizations of unoriented y form films generally lead to unoriented co-crystalline hlms, which in turn lead to essentially unoriented 5 form hlms by guest removal [74,75,112], By chloroform treatment of unoriented y form hlms, a co-crystalline phase is obtained with orientation of chain axes prevailingly perpendicular to the him plane [74,75], Moreover, the nano-porous e form hlms obtained by chloroform removal [53-56], also present a preferential perpendicular orientation of chain axes. 

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