Fig. 3.
Structural changes occurring during the bidirectional actuation of a programmed cPEVA20d20 ribbon. (A and B) Changes of the scattering pattern determined by 2D WAXS (A) and 2D SAXS (B) recorded for shapes A and B as well as for shapes A′ and B′ after (re)programming and in subsequent reversible actuation cycles. (Tsep = 75 °C, Tlow = 25 °C, upper series εssp = 150%, and lower series εssp = 100%). Numbers indicate steps during experiment. (C) Changes of long periods schematically shown for cPEVA during bidirectional actuation.