The traditional single-network hydrogel has poor mechanical properties,and it is difficult to use as a dural repair material with high requirements for mechanical strength and comprehensive properties.Improving the mechanical properties of hydrogels is of great significance for the application of hydrogels.In this paper,polyvinyl alcohol/montmorillonite(PVA/MMT)hydrogel films with excellent mechanical properties and fatigue resistance were prepared by evaporation-induced assembly method.The thickness of the prepared PVA/MMT hydrogel film is between 200 and 300 μm,the breaking stress is 9.5±0.2 MPa,the modulus is 9.0±0.9 MPa,and the fatigue strength is 1154.02 J·m-2,these parameters are better than the existing biopolymer hydrogels.After the addition of montmorillonite(MMT),the mechanical properties of PVA/MMT hydrogel films were improved.This is due to the formation of an ordered layered structure in the PVA/MMT hydrogel film by MMT.After the PVA70/MMT30 hydrogel film that is crosslinked with glutaraldehyde,a C—O—C covalent bond is formed between PVA and MMT,which further improves the mechanical properties of the films.
Polyvinyl alcoholMontmorilloniteNanosheetHydrogelThin film materials
NETL
NSTL
万方数据
