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To verify the successful copolymerization of KL with AA and MMA, the chemical structure of KL-AA and KL-AA-MMA samples was determined by 1 H-NMR and 31 P-NMR. As seen in Figure 2 a, a new resonance at 3.5–4 ppm emerged for all KL-AA-MMA copolymers, which was assigned to the methoxy group (-OCH 3 ) of MMA [ 28 ].