The residual strain(ε′) characterizes the permanent set caused by chain slippage, and the recovery strain(ε-ε′) characterizes the deformation caused by changes of bond angle and the orientation of chain segment. 残存应变ε′表征了由链滑移而产生的永久形变,回复应变(ε-ε′)表征了键角变化和链段取向产生的形变。