shape fixity r f a u2192 b being 83 5 and 74 5 respectively suggesting that the first shape fixity is closely related to the difference between the two deformation temperatures in the corresponding triple shape memory cycle the dynamic shape memory effect of this perfluorosulfonic acid ionomer is also reflected in a quadruple shape memory effect as demonstrated in fig1 starting as a permanent shape a the ionomer can memorize three temporary shapes b c and d in each shape memory cycle subsequent heating at the relevant temperatures led to the recovered shapes c rec b rec and a rec the thermomechanical testing summarized in fig1 was conducted as follows t d1 t r3 140 u00b0 c t d2 t r 2 90 u00b0 c t d3 t r1 53 u00b0 c the following fixity and recovery values were experienced in the ribbon r f a u2192 b 58 7 r f b u2192 c 57 1 r f c u2192 d 96 1 shape recovery r r d u2192 c 100 0 r r c u2192 b 99 6 r r b u2192 a 93 0 while the r r values at all three recovery stages were above 93 the first and second r f values were only about 60 theoretically multi shape memory effects beyond quadruple u2014 are feasible as indicated in the multi stage recovery shown in fig7 it appears however that r f would be further compromised as the fixation of more temporary shapes demands shape fixation at a temperature too close to the corresponding deformation temperature overall this perfluorosulfonic acid ionomer exhibits unprecedented versatility as a shape memory polymer reflecting the.