Preparation and Characterization of Cation-π Cross-linked Indolyl High-strength and Tough Polyvinyl Alcohol Films
In this study,we address the issue of insufficient mechanical properties in traditional polyvinyl alcohol materials.To overcome this limitation,we propose using cation-π interactions to construct a dynamic cross-linking network between molecular chains.Specifically,we employ 3-isocyanato-2-phenylindole as indole-based carrier to prepare an indolyl polyvinyl alcohol linear polymer(PVAI).Subsequently,we introduce an appropriate amount of MgCl2 to create a cationic-π cross-linked indole-based polyvinyl alcohol film(PVAI-Mg).The film's structure and performance were characterized using various techniques,including thermo-gravimetric analysis,differential scanning calorimetry,electronic universal testing machine,and infrared spectroscopy.Our findings reveal that when the Mg2+doping amount is 7.5％of the molar amount of indole units,the tensile strength of the crosslinked film is 50.97 MPa(the tensile strength of the PVA film is 19.47 MPa),and the elongation at break of the crosslinked film is 402.3％(the elongation at break of the PVA film is 368.8％).These results indicate that the interaction of Mg2+and cation-π in indole significantly enhances the mechanical properties of the film.
万方数据
维普
