Synthesis of room-temperature self-healing network polymers based on multiple metal–ligand coordination interactions
摘要
A series of novel network polymers P1-P6 and Pn-Znx:y based on metal–ligand coordination bonds with different strength were prepared by one pot method. The structures of the polymers were confirmed by NMR and FT-IR spectra. The amorphous structure of polymers was determined by X-ray diffraction analysis with only broad scattering peaks detected. The TGA and DSC showed that the increase of pyridyl group can dramatically improve the thermal stability of polymers, and Tg gradually decreases with the increase of pyridyl and pyridine groups. When the amount of Zn(II) increases, the thermal stability and the Tg gradually decreases. Optical microscope images indicated that the cross-linked network polymers Pn-Zn1:2 all had obvious self-healing properties at room temperature, and the 50% cross-linked network P3-Zn1:2 and P4-Zn1:2 with less pyridine content have better self-healing performance. Further exploration of the self-healing properties of P3-Znx:y by adjusting the molar ratio of dianhydride to Zn(II), P3-Zn1:4 has the best self-healing performance.