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Glass Fiber Pure Graphite Get A Compact Structure, Good Mechanical Properties
- Jul 04, 2017 -

Glass Fiber Pure Graphite is developed in 2011, a natural graphite as the initial raw material of the new carbon fiber, from graphene or functionalized graphene nanosheets liquid crystal liquid by wet spinning one-dimensional orderly assembly. Glass Fiber Pure Graphite has good mechanical properties, electrical properties and thermal conductivity, can be used for conductive fabrics, heat, energy storage and other fields. The invention relates to a graphene composite fiber which can be obtained by introducing other substances into the Glass Fiber Pure Graphite, and adding the polymer to the Glass Fiber Pure Graphite to obtain a graphene shellfish fiber with excellent structure and good mechanical properties; adding the magnetic nanoparticles to the magnetic graphite And the addition of Ag nanowires to obtain highly conductive graphene composite fibers. The excellent flexibility of the Glass Fiber Pure Graphite makes it suitable for applications such as flexible devices such as flexible supercapacitors. The preparation and application of Glass Fiber Pure Graphite and graphene composite fiber are expounded in detail, and the development direction of Glass Fiber Pure Graphite is prospected.

Carbon is the material basis for the formation of life, but also in the human material life has an irreplaceable position. Whether it is cotton fiber or chemical fiber in clothes, sugar in food, protein and fat, or people living in the house, travel a variety of means of transport, carbon elements are essential. Carbon elements can not only form a soft graphite, but also crystal to form the most hard material --- diamond. In addition, the carbon element also has a low density, light and so on. With the increasing demand for new lightweight high-strength materials, carbon-based fibers have become a new material developed under the high-tech drive. Carbon fiber is a high-performance fiber with carbon content of more than 90%, which can be divided into polyacrylonitrile-based carbon fiber, asphalt-based carbon fiber and viscose (cellulose) carbon fiber according to raw materials. In 1959, Fujitsu was the first to produce PAN-based carbon fiber. In 1962, Toray Company of Japan began to produce and actively developed for the production of carbon fiber dedicated high-quality silk, and in 1967 successfully produced T300PAN-based carbon fiber. Because of its comprehensive mechanical properties and relatively low cost, as the mainstream of industrial production products, Glass Fiber Pure Graphiteaccounting for about 90% of the global total carbon fiber. Its production process mainly includes the manufacture of PAN precursor, pre-oxidation, low temperature carbonation, high temperature carbonation 4 steps. In addition, in order to improve the adhesion between the carbon fiber and the resin, the carbon fiber is subjected to surface treatment such as dipping. Among the many PAN-based carbon fiber products, Toray produced by Japan's carbon fiber is the internationally recognized representative products, the main models are T300, T700, T800, T1000, T1100 and so on. Which T1100 tensile strength of the highest, up to 6.6GPa, tensile modulus up to 324GPa. In addition, T series products can also be through the follow-up high-temperature graphitization process to obtain higher modulus of graphite fiber, China from the late 1960s began to develop carbon fiber, compared with foreign countries there is still a big gap.

Carbon nanotube fibers are another important member of carbon-based fibers, and their preparation methods are mainly solution spinning, carbon tube array spinning and floating chemical vapor deposition (cvd) spinning. Solution spinning method is to use CNTs with strong The proton solvent is dispersed or added to the surfactant to form a liquid crystal, using a wet spinning technique. In 2000, the Poulin team dispersed the single-walled carbon nanotubes in 10% sodium dodecyl sulfate solution and injected the polyvinyl alcohol solution at a given injection rate to prepare the fibers for the first time. The mechanical properties of CNTs prepared by solution spinning are not ideal, and the tensile strength is only 18gpa, which needs to be improved. In addition, the strong sub-solvent used in the dispersion of CNTs is corrosive and the additives added will also affect the purity of the obtained CNTs fibers. CNTs array spinning method is the key to the preparation of continuous spinning of CNTs array, this method of CNTs fiber tensile strength of up to 33GPa, but the preparation of CNT array of high cost, it is difficult to scale production. Floating CVD spinning refers to the direct spinning of airgels in CVD vertical growth furnaces. The process is relatively simple, but there are residual catalyst impurities in the fibers.

The preparation of traditional carbon fiber and CNTs fibers requires high temperature cracking process: carbon fiber is pyrolyzed with polymer precursors;Glass Fiber Pure Graphite CNTs fibers need to catalyze the cracking of hydrocarbon molecules to produce carbon tube elements. This high-temperature pyrolysis process energy consumption, will produce harmful gases and dust pollution. Therefore, there is an urgent need to explore carbon fiber low temperature, green preparation of new principles and new methods. Based on this, the author of the group put forward the concept of Glass Fiber Pure Graphite.