“…This condition is necessary because the molecules have to respond dramatically to applied stress by changing their conformations. In addition, high flexibility is also essential, i.e., the internal mobility with free rotations about skeletal bonds that enable the necessary molecular rearrangement not to be hampered by constraints due to inherent molecular rigidity (Gotlib, Torchinskii, Toshchevikov, & Shevelev, 2006). A coherent, multiconnected stable structure resists mechanical perturbation (Rehage & Hoffmann, 2006).…”