Abstract
The layered hydrated sodium salt-magadiite (MAG), which has special interpenetrating petals structure, was used as a functional filler to slowly self-assemble with sodium carboxy-methylcellulose (CMC), in order to prepare nacre-like nanocomposite film by solvent evaporation method. The structure of prepared nacre-like nanocomposite film was characterized by Scanning Electron Microscope (SEM) and X-ray diffraction (XRD) analysis; whereas, it was indicated that CMC macromolecules were inserted between the layers of MAG to increase the layer spacing of MAG by forming an interpenetrating petals structure; in the meantime, the addition of MAG improved the thermal stability of CMC. The tensile strength of CMC/MAG was significantly improved compared with pure CMC. The tensile strength of CMC/MAG reached the maximum value at 1.71 MPa when the MAG content was 20%, to maintaining high transparency. Due to the high content of inorganic filler, the flame retarding performance and the thermal stability were also brilliant; hence, the great biocompatibility and excellent mechanical properties of the bionic nanocomposite films with the unique interpenetrating petals structure provided a great probability for these original composites to be widely applied in material research, such as tissue engineering in biomedical research.
Highlights
Researchers reported that many naturally-occurring materials, such as the wings of insects or the beaks of woodpeckers, have unique structures, which endow them with specific properties [1].Their structures often provide inspirations for researchers to design materials that meet particular functions [2,3]
The results indicated that the mechanical behavior of the nacre-like nanocomposite film was effectively improved, especially tensile strength
2a,b show the Scanning electron microscope (SEM) images of carboxy-methyl cellulose (CMC)/MAG–20 and CMC/MAG–40, respectively. It can be seen from the figures that most of the MAG rose petal-like microspheres in CMC/MAG–20 were peeled off; the layer spacing was stretched up to varying degrees, and a part of the MAG exists in a monolayer structure, indicating that the part of the MAG has been completely peeled by the CMC macromolecule
Summary
Researchers reported that many naturally-occurring materials, such as the wings of insects or the beaks of woodpeckers, have unique structures, which endow them with specific properties [1]. The Mollusca had evolved efficient strategies to synthesize order layer-shaped “brick-motar” (a “motar” being a fabricator of brick) characteristic microstructures, which is similar to modern architecture, to prepare a tough model structure of nacre [10,11] It is the complex multi-stage structure that makes the nacre both high in strength and toughness. In comparison to other common layered silicate, apart from this, MAG has layers that had certain radian, forming interpenetrating petals structure when they aggregate [45]; and this goes for the sodium carboxymethylcellulose (CMC), which has great biocompatibility to be used as the “motar”, to fabricate a novel nacre-like nanocomposite film by the casting "solvent evaporation" method. Based upon the thermal gravimetric (TG) analysis and combustion tests, the thermal stability and flame resistance of CMC/MAG composite films were enhanced considerably, as well as maintaining a certain degree of transparency; there has remained some suspense for further explore all of the other outstanding properties which have not yet been investigated deeply in other researches
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