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[Industry Focus]：Melamine "gorgeous transformation", new materials may bring significant changes to the fields of automobile, aerospace, bulletproof, etc.

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Do you still remember melamine? It is the notorious "milk powder additive", unexpectedly, it may be "gorgeous transformation".

On February 2, the authoritative international scientific journal Nature published a research paper claiming that melamine can be made into a material harder than steel and lighter than plastic, which is very surprising. The paper was published by a team led by Michael Strano, a professor in the Department of Chemical Engineering at the Massachusetts Institute of Technology and a famous materials scientist. The first author is postdoctoral Zeng Yuwei.

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, it is reported that they will use melamine invented material named 2DPA-1, this two-dimensional polymer can self-assembly into a sheet, forming a low density but extremely strong high-quality material, has applied for two patents.

Melamine is commonly known as melamine. Under normal conditions, it is a white monoclinic crystal. It looks similar to milk powder. It is slightly soluble in water and has a viscosity like milk after flushing. Therefore, it was once called protein essence, but in fact, there is no protein substance needed by human body, and it cannot be drunk as milk. Its essence is a triazine nitrogen-containing heterocyclic organic compound, which is normally used as a chemical raw material.

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melamine is tasteless and soluble in methanol, formaldehyde, acetic acid, glycerin, pyridine, etc. in addition to being slightly soluble in water, but insoluble in acetone and ethers. It is harmful to human body. China and the World Health Organization have clearly stipulated that melamine should not be used in food processing or food additives. However, in fact, melamine as chemical raw materials and construction raw materials is still very important, especially in coatings, paints, plates, adhesives and other products have a large number of applications.

the molecular formula of melamine is C3H6N6, and the molecular weight is 126.12. Through its chemical formula, it can be known that melamine contains three elements of carbon, hydrogen, and nitrogen, and contains the structure of carbon and nitrogen rings. Scientists at the Massachusetts Institute of Technology In the experiment, it was found that these melamine molecular monomers can grow in two dimensions under appropriate conditions, and the hydrogen bonds in the molecules will be fixed together, it makes it form a disc shape in continuous stacking, just like the hexagonal structure formed by two-dimensional graphene, and this structure is very stable and strong, so melamine is transformed into a high-quality two-dimensional sheet called polyamide in the hands of scientists.

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Strano said that the manufacture of this material is not complicated, it can be spontaneously produced in solution, and then 2DPA-1 film can be taken out of it, which provides a simple method for mass production of this extremely tough and thin material.

researchers have found that the modulus of elasticity of new materials, that is, the force required to measure deformation, is four to six times that of bulletproof glass. They also found that although the density of the polymer is only 1/6 that of steel, its yield strength or the force required to destroy the material is twice that of steel.

Another key characteristic of this material

is its air tightness. While other polymers consist of twisted chains with gaps for gas leakage, the new material consists of monomers stuck together like Lego blocks, and molecules cannot enter between them.

scientists said: "This allows us to create ultra-thin coatings that fully prevent water or gas penetration. This type of barrier coating can be used to protect automobiles and other vehicles or steel structures from metal."

now researchers are studying how this special polymer can form two-dimensional sheets in more detail, and are trying to change its molecular composition to create other types of new materials.

, it is obvious that this material is very ideal, if mass production can be achieved, it will bring major changes to automotive, aerospace, bulletproof and other fields. Especially in the field of new energy vehicles, although many countries plan to phase out fuel vehicles after 2035, the battery life of new energy vehicles is still a problem. If this new material can be used in the automotive field, it means that the weight of new energy vehicles will be greatly reduced, and at the same time, it can also reduce power loss, which will indirectly increase the cruising range of new energy vehicles.

Source: Science and Technology Business View, Popular Science World, etc

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