草榴短视频

During the scientific and technological program "Grand Challenges" in "Sirius" participants of the direction "New Materials" under the guidance of scientists of the Department of Nanostructured, Fibrous and Composite Materials named after A.I. Meos of 草榴短视频 Natalia Lukicheva, Olga Gladunova and Vadim Martsenyuk studied how to increase the characteristics of composite materials by adding nanoparticles with useful properties. The schoolchildren conducted an experiment on modifying the material consisting of carbon fiber and epoxy resin with graphene nanoparticles. This composite has high strength, hardness and lightness, making it suitable for many applications, especially in shipbuilding and space.

Existing artificial and synthetic materials do not always meet the needs of modern industry. That is why the scientists of SPbSUPTD have a goal to create new and modify existing ones, comprehensively improving their properties. This task can be solved by introducing modifying additives into the composition of the composite.

One of the program teams together with mentors from St. Petersburg State University of Industrial Technologies and Design (草榴短视频) worked on samples of carbon fiber-reinforced plastic, which consists of carbon fibers and epoxy resin modified with graphene. It was obtained by scientists only in 2004. The tests revealed its phenomenal strength, which predetermined the increased interest in this material on the part of researchers in the last two decades.

The project participants hypothesized that if continuously reinforced carbon composite is modified with graphene nanoparticles, it is possible to obtain a material with higher strength. The improved properties will allow reducing the number of reinforcing layers in the composite during the manufacturing of the product and reducing the weight of the future structure without losing quality.

Composite materials consist of several components with different physical and chemical properties. Depending on their combinations we can get different characteristics we need in the material. As part of this project, we offered schoolchildren to experiment with the addition of graphene nanoparticles. The basis of our material is carbon fiber, which is strong in itself. The resin binds the components of the composite, forming its matrix. But as an independent unit, it is quite fragile. Its properties can be improved if it is pre-modified with strong and lightweight graphene. This will give us the ability to create strong materials without weighing down the entire structure."

Natalia Lukicheva, Senior Lecturer of the A.I. Meos Department of NVCM, 草榴短视频 The work on the project consisted of several stages

First, the guys investigated options of chemical and physical preparation of graphenes for their subsequent introduction into the binder - polymer resin. They selected modes and technologies of introduction, studied changes in the properties of the polymer matrix after nanomodification. After selection of the optimal variant, several samples were made by hand laying. Some of them were subjected to tests to determine the tensile strength. And a part was investigated for chemo- and water resistance, also adhesion of the modified polymer binder to carbon fibers was studied, including with the help of electron microscope. The experiments showed that the modified resin shows better adhesion, and the addition of graphenes in the amount of only 1.0-1.5% increases the tensile strength and hardness of the polymer matrix by about 20%.

During the work on the project we have studied two most common technologies of composite products production - hand molding and casting technology. We learned how to determine the chemoresistance of the matrix to solvents. We realized that the addition of graphenes does not change the hydro- and lyophobicity. We learned how to determine the adhesion and viscosity of the material. Within this project we worked with various equipment, familiarized ourselves with numerous laboratory and analytical methods of analysis. This is a very big research and at the same time practice-oriented work".

Nikita Nesterov, a schoolboy from Rostov-on-Don, one of the project participants

At the festival, the project participants presented manufactured samples of nanomodified composite materials, and also told the guests about potential areas of their application. Besides, the schoolchildren prepared the technical and economic evaluation of the project and formalized the results of the research of physical, mechanical and chemical properties of the manufactured carbon composites.