从图4（a）中可以看出共聚物在结合能288.48eV和284.33eV

It can be seen from Figure 4(a) that the copolymer has two new peaks at the binding energy of 288.48eV and 284.33eV, corresponding to O=CO in BA and C=C in ST in turn, at the binding energy of 287.67eV The disappearance of the peak may be caused by graft copolymerization to a certain degree of damage to the starch backbone.

From Figure 4 (a), it can be seen that the copolymer in the combination of energy 288.48eV and 284.33eV new two peaks, in turn, the corresponding is the BA in the O-C-O and ST in the C-C, in combination of 287.67eV peak disappeared, may be the copolymer caused a certain degree of damage to the skeleton.

It can be seen from Fig. 4 (a) that there are two new peaks at the binding energy of 288.48ev and 284.33ev, which correspond to o = C-O in Ba and C = C in St. the peak disappears at 287.67ev, which may be due to the damage of starch skeleton caused by graft copolymerization.