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Introduction OF Carbon Fiber Reinforced Polycarbonate
Release time:2024-03-26 | Source:Dongguan Ciry INCHR New Material Co., Ltd | Hits:1Introduction OF Carbon Fiber Reinforced Polycarbonate
As a new product with advanced technical features, carbon fiber reinforced polycarbonate(PC) is gradually used in industry and daily life. Compared with traditional glass fiber reinforced polycarbonate, it has significant advantages such as high strength and high conductivity.
Effect of carbon fiber on mechanical properties
After carbon fiber reinforcement, the tensile and bending strength are greatly improved. As the amount of carbon fiber increases, the tensile strength, flexural strength and flexural modulus all increase significantly. Compared with pure PC (tensile strength is about 63MPa, flexural modulus is about 2300MPa), when 2% carbon fiber is added, the tensile strength and flexural modulus increase by 12% and 60% respectively. Because in the fiber-reinforced thermoplastic composite system, the high strength of the fiber is used to withstand the main stress of the composite material, and the plastic flow of the matrix resin and the adhesion with the fiber interface are used to transmit the stress. Therefore, as the carbon fiber content increases, more carbon fibers are carried on any cross-section of PC. To extract or break these carbon fibers, a greater load needs to be applied, thus improving the bending performance and tensile strength of carbon fiber reinforced polycarbonate(PC). At the same time, due to the increase in carbon fiber content, that is, the resin layer between carbon fiber and carbon fiber becomes thinner, the stress acting on the carbon fiber reinforced polycarbonate(PC) is easily transmitted through the resin layer to the carbon fiber, and the deformation of the resin is also constrained by the carbon fiber, so the bending elastic modulus The amount also increases with the increase in carbon fiber content.
The notched impact strength changes significantly after carbon fiber reinforcement. The notched impact strength first increases and then decreases with the increase of carbon fiber. When the carbon fiber content is 6%, the impact strength reaches the maximum, when the content is greater than 6%, it decreases rapidly, and when it reaches 8%, the decrease rate slows down. As can be seen from the figure, even if only 2% of carbon fiber is added, the elongation at break has dropped significantly compared to PC resin (the elongation at break of PC resin is as high as 100%). carbon fiber reinforced polycarbonate(PC) absorbs impact energy in three ways: resin deformation and crack expansion to fracture, fiber extraction, and fiber breakage. Due to the difference in the deformation ability of PC under impact load, the larger deformation of the PC matrix results in gaps along the fiber bending direction. Therefore, on the one hand, the energy absorbed when the fiber is extracted is smaller, and on the other hand, the possibility of fiber breakage is reduced. property, which is equivalent to increasing the critical breaking length of the fiber. When the carbon fiber content is less than 6%, it can be considered that the contribution of resin deformation to the notched impact strength of the composite material dominates; while when the carbon fiber mass fraction is higher than 6%, the resin content is reduced, making it easier to extract the fiber from the resin. In addition, the end of carbon fiber is the trigger point for crack growth. When the carbon fiber content reaches a certain level, continuing to increase will reduce the impact strength and elongation of the material.
Increase electrical properties
Pure PC is a non-conductive polymer. As can be seen from the figure, when the carbon fiber content is 10%, the surface resistivity has reached 9.0 %, the conductive properties ofcarbon fiber reinforced polycarbonate(PC) have been significantly improved. When the carbon fiber content is less than 8%, the composite material shows a higher resistivity. This is because the resistivity of the PC resin is very high. A small amount of short carbon fibers are separated by the PC resin, and there is only discontinuous conduction between the fibers. Potential barrier, carriers can only jump from one conductor to another conductor through the tunnel effect, so the composite material shows a higher resistivity; when the carbon fiber content exceeds 8%, carbon fibers gradually form in the composite material The conductive network is in contact with each other and tends to be perfect. At this time, there are two paths for charge carrier conduction: first, the carriers are transferred through the tunnel effect between the carbon fiber and the polymer interlayer; second, the carriers are directly transferred to each other through the fibers. Network transfers formed by contacts. Therefore, the electrical properties of carbon fiber reinforced polycarbonate(PC) are greatly improved, showing low resistivity.
Carbon fiber reinforced PC series products
INCHR can currently provide 6%, 10%, 15% and 25% long carbon fiber reinforced polycarbonate(PC) series products, which respectively meet the application needs of high impact resistance, anti-static grade, conductive grade, high strength and high thermal conductivity.
Regarding the thermal conductivity of carbon fiber reinforced polycarbonate(PC), due to the ultra-high thermal conductivity of carbon fiber in one dimension (exceeding metal), highly filled PC can be used as an excellent thermal conductive plastic with a thermal conductivity as high as 20-40W/mK.
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