One‐step synthesis of hydrophilic graphene‐Fe₃O₄‐PVA composite film: Micromorphology and performance

Abstract

Multifunctional polymers have wide applications in smart materials. In this study, the multifunctional polymer (hydrophilic graphene‐Fe3O4‐PVA, GFP composite films) were synthesized by mixing with hydrophilic graphene (HG), ferrous ammonium sulfate, and ferric chloride in PVA solution through one‐pot coprecipitation method. GFP composite films were characterized by XRD, FT‐IR. Their morphology and particle size of Fe3O4 in GFP composite film were observed by TEM, SEM, and AFM. The results indicated that the morphology of Fe3O4 in GFP could be modulated from sphere shape to rod structure by the loading quantity of HG. Besides, many properties of GFP composite films were investigated. Firstly, GFP composite films demonstrated the fast magnetic response and high thermal stability. Secondly, the introduction of HG not only simultaneously enhanced the stiffness and ductility of GFP composite films, but also improved their flame retarding performance. Finally, HG regulating effect for the morphology of Fe3O4 in GFP and improvement mechanism of HG for mechanical performance of GFP composite films were illustrated. Both of them might be contributed to the hydrogen bonds effect among Fe3O4, PVA, and HG. Thus, these multifunctional GFP composite films can be applicable as the basis of fabricating smart materials in different fields. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48174.

Fabrication of New Fe3O4/PVA/(C6H7O6Na)n Nanohybrid Ferrogels for Antibacterial Applications

“…The amorphous phase, with a broad diffraction peak detected at 2θ of approximately 19.5°, was attributed to PVA. This is consistent with the results of the previous work 14 . Meanwhile, the XRD patterns of the crystalline phase showed diffraction peaks at 2θ of 30.1°, 35.6°, 43.3°, 57.3°, and 63.0°, which represent the (200), (311), (400), (422), (511), and (440) planes of Fe 3 O 4 , respectively 15 .…”

Hydrogen‐bonding assembly of heteropolyacid and poly(vinyl alcohol) for strong, flexible, and transparent UV‐protective films

“…This phenomenon indicates the possible existence of interaction between the SiMoA and PVA matrix. The optical bandgap of neat PVA and PVA composite films is determined by the below given Tauc's relation: α h ν = B (h ν − E g ), where α , h, ν , B , and E g are absorption coefficient, Plank constant, light frequency, a constant, and optical bandgap energy, respectively. The variation of ( α h ν ) 1/2 versus h ν is plotted in Figure (b), from which the E g of the samples can be obtained.…”

“…Among those environmental friendly materials, poly(vinyl alcohol) (PVA) is one of the important and widely studied biodegradable polymer. As a commercially available biodegradable polymer, PVA possesses low cost, excellent optical transparency, film formation, gas barrier, and mechanical properties and is extensively applied in the fields of package, biomedicine, filters, and so on. However, high ultraviolet (UV) radiation transmittance associated with PVA is not conducive to its application such as in the UV‐protective field.…”