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Similarly, in the packaging industry, the research on nano-packaging materials has also received great attention. Countries such as Europe, America and Japan have invested a lot of human and material resources in research and development, and have achieved remarkable results. As we all know, the negative barrier property of packaging materials has always been an important performance in both hard and soft packaging, because the shelf life (shelf life) of packaging products is directly related to this performance. In order to improve the negative barrier properties of packaging materials (mainly polymers), many modified studies, composite studies, and processing processes have been performed on polymers of this polymer structure for many years, and remarkable results have been achieved. It is on the basis of a large amount of research that there are now hundreds of kinds of plastic packaging barriers developed in the world and have achieved a wide range of applications. However, there is still a considerable distance to make the barrier of this material to the level of a glass container or metal film. At present, the results of nanotechnology theory and applied research have opened up a new way to further improve the negative barrier properties of packaging. This article will introduce a class of polymer-based nanocomposites under development. The goal of the research is to enable packaging materials to achieve a new level of barrier properties while improving overall performance through nanotechnology.
Second, the basic principle According to the basic theory of nanotechnology we can see, the nano-scale particles into the polymer lattice array, you can improve the material's strength, stiffness and barrier properties. At the same time, compared with other conventional filled polymers, nanomaterials have very little particulate loading. Nanometer-sized particles, such as montmorillonite clay, can significantly reduce the permeability of the base material. The main reason for this is based on the fact that the filling of the plate-like silicic acid layer in the material hinders the ability to disperse molecules in the material diffusion channel, thereby increasing the barrier property of the material. In this polymer-clay nanocomposite, clay has good mechanical properties and thermal stability, while organic compounds have good processability.
Silica gel layer groups belonging to the natural state are smectic clays, which are commonly known as "swelling clays" because their structure has the ability to absorb ions and other polar ions. Colloidal clay material is composed of two A tetrahedral silicon layer is fused to an edge-connected octahedron to form a layer that is fused to an edge-connected octahedron-shaped aluminum layer, which is composed of overlapping layers of weakly dipolar and plastic. The force is separated and an intermediate layer or long channel is formed.In the Jiaoling soil, the octahedral side is mainly filled with aluminum ions, but some sides are filled with magnesium ions or other elements.Because there is magnesium ion on the octahedron side, The entire negative charge needs to be equilibrated with sodium ions or calcium ions to a small amount of intermediate layer cations, and these intermediate layer cations fill the space of the entire intermediate layer. This is the structural state of the nanoparticles formed by the Jiaoling clay material.
The lack of affinity between hydrophilic silicates and generally non-hydrophilic polymers makes it difficult to obtain uniform mixing. Natural rubber clay is a hydrophilic material that is incompatible with most organic polymer materials. By using organic cations instead of interlayer molecules on the gelled ridges. This cross-reaction of ions with phosphorus ions can form an organophilic surface. Ammonium ethanolate also provides a functional substrate that reacts with the polymer and improves the bonding of the interface between the polymer and the clay material.
The structure of nanocomposite polymeric materials may be divided into two types: sandwich type and lamellar type. In the former, a composite material of a multi-layered phase sandwich structure with a uniform arrangement can be obtained by inserting a single stretched polymer chain in the middle of each silicate layer. In lamellar or layered composites, the lamination between the layers is separable, and in a single silicic acid material, lamination between the layers is separable, and a single silicic acid layer is polymerized There are two synthetic methods in the matrix. One method is through in-situ polymerization, which involves the addition of a single polymer immediately after the polymerization; one method is to add the polymer through the solution. The addition of the polymer can also be achieved by using a method which can also be achieved by adding above the polymer, that is, by slowly cooling the mixture of the polymer and the nanoparticle at a temperature above the glassy temperature of the polymer. After forming a polymer molecular chain, it diffuses in the molten state of its material and integrates into the channel between the silicate layers. Polymer-silicate nanocomposites can be made from a variety of polymer materials such as polystyrene, polypropylene, polyamide (nylon), epoxy, and plexiglass. (To be continued)
I. Introduction As we all know, nanotechnology is a high technology developed internationally in the last 10 years. It has received great attention in many fields of science and technology, and its application prospects are very promising. In particular, the application of nanotechnology in the field of materials engineering is even more successful. The so-called nanomaterial is a material composed of a crystal grain size of 1 to 100 nanometers (negative 9 square meters of 1 nanometer=10). Since the crystal grain size is much finer than that of a conventional material, it is in the grain boundary thereof. The number of atoms above the number of atoms inside the crystal grains gives the nanomaterials many exceptional properties. Compared with conventional materials, in addition to excellent mechanical properties, nanomaterials also exhibit better physicochemical properties, including optoelectronic, electromagnetic and thermal properties. Therefore, the industry has given extensive attention and attention to this.