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(a) Force–deformation curves of poly(St-co-DVB-co-PUDA) with gradient composition G3 upon impact loading in three directions: stiff and flexible layers exposed to the load as well as the side perpendicular to the gradient. (b) Force–deformation curves of poly(St-co-DVB-co-PUDA) with homogeneous (S8 and S9) and gradient composition (G3) upon impact on the stiff layer.
