As shown in Fig nbsp a

As shown in Fig. 2(a), two strong GDC0941 bands with frequencies at 1737 and 1448 cm−1 are displayed in the FT-IR spectrum of the magnetic PGMA, and they can be assigned to the CO stretching of the carbonyl groups of GMA and the CC stretching of the benzene ring of DVB, respectively, revealing that copolymerization of GMA and DVB is successful. After interpenetration of PDVB in the pores of the magnetic PGMA, these two bands are found in the FT-IR spectrum of the obtained PGMA/PDVB IPNs. In particular, the absorption band at 1644 cm−1 related to the CC symmetry stretching also appears for PGMA/PDVB IPNs, implying that interpenetration of PDVB in the pores of PGMA is successful and the obtained PGMA/PDVB IPNs is a typical IPNs. After the amination reaction, a broad vibration appears between 3335 and 3500 cm−1, and this vibration is concerned with the N–H stretching of the –NH2/–NH– groups [41] and [42]. The absorption at 3600 cm−1 may be related to the O–H stretching [43], [44] and [45]. Meanwhile, a vibrational band related to the N–H deformation is observed at 1512 cm−1, another vibration associated with the C–N stretching appears at 1058 cm−1. Additionally, the weak basic exchange capacity of the magnetic PMADETA/PDVB IPNs is measured to be 3.2 mmol/g, whereas those of PGMA and PGMA/PDVB IPNs are determined to be 0, implying that the PGMA networks in the IPNs are transformed to PMADETA networks successfully and the magnetic PMADETA/PDVB IPNs was synthesized accordingly.