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SEM images of surface morphology with magnification of 250× by increasing weathering exposure days for HDPE (A,B,C,D at T0, T1, T2, and T3, respectively), LDPE (E,F,G,H at T0, T1, T2, and T3, respectively), PC (I,J,K,L at T0, T1, T2, and T3, respectively), PP (M,N,O,P at T0, T1, T2, and T3, respectively), and PS (Q,R,S,T at T0, T1, T2, and T3, respectively).
