Preparation method of a kind of imitation abalone shell montmorillonite-polydimethylsiloxane nanocomposite material

Abstract

The invention relates to a method for preparing abalone-like montmorillonite-polydimethylsiloxane nanocomposite materials. By using ice template technology, natural montmorillonite and polyvinyl alcohol are assembled into a layered porous framework, and infiltrated into polyvinyl alcohol. Dimethylsiloxane constructs a layered structure imitating abalone shell. Fluorescent functionalization of the layered framework was achieved by introducing aggregation-induced luminescent molecules. The high-toughness nanocomposite with imitation abalone shell structure realizes the strengthening and toughening of polydimethylsiloxane. At the same time, the microstructure and fracture process of the material can be characterized by confocal fluorescence microscopy, and the strengthening and toughening properties can be obtained more intuitively. mechanism. Compared with the traditional electron microscope, the characterization process after fluorescence functionalization can avoid the interference of the surface morphology of the sample, distinguish different components, not be affected by the conductivity of the sample, and obtain the three-dimensional structure information of the sample.

Description

technical field [0001] The invention relates to a preparation method of abalone shell montmorillonite-polydimethylsiloxane nanocomposite material, and belongs to the field of nanocomposite material preparation. Background technique [0002] Polydimethylsiloxane is one of the commonly used soft materials, due to its excellent biocompatibility and stability, high transparency and easy formability, in microfluidics, tissue engineering, flexible devices, wearable devices and It has broad application prospects in many other fields. However, the Young's modulus of polydimethylsiloxane is extremely low, and for many of these applications, the modulus and load-bearing capacity of polydimethylsiloxane are in urgent need of improvement. Changing the crosslink density can effectively increase the Young's modulus from 0.05 MPa to about 2 MPa (Biomaterials, 2017, 145, 23.). However, excessive crosslinking may also lead to impaired tensile properties of polydimethylsiloxane. For exampl...

AI Technical Summary

Problems solved by technology

However, it is difficult to reveal the toughening mechanism of layered nanocomposites imitating abalone shells by conventional characterization methods such as in situ scanning electron microscopy

The disadvantages of traditional SEM include: 1. It is difficult to realize three-dimensional imaging; 2. The surface morphology of the sample interferes with the characterization; 3. It is limited by the conductivity of the sample; 4. It is difficult to distinguish different components

[0005] In recent years, there are few patents on polydimethylsiloxane strengthening and toughening, for example, the method of using nano-material modified PDMS to make a hot molding mold (CN101554758A), a self-healing silicone material preparation method (CN109575291A), a Preparation method of long-chain branched PDMS-g-PE copolymer (CN107746464A), glass fiber reinforced PDMS copolycarbonate resin (CN107849306A), preparation method and application of a high-strength and high-toughness thermosetting resin-based composite material (CN107163204B) etc., but these patents did not involve the concept of bionics for the reinforcement and toughening of polydimethylsiloxane, and did not propose a new characterization method for the characterization of polydimethylsiloxane composite materials

[0006] In summary, the current strong and integrated polydimethylsiloxane-based nanocomposites are still a big challenge, and the characterization methods also need to be further expanded

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