Factors affecting the performance of carbon fiber reinforced PPS woven composite board

Factors affecting the performance of carbon fiber reinforced 

PPS woven composite board

PPS polyphenylene sulfide material has outstanding performance in heat resistance, flame retardant, dielectric, chemical resistance and dimensional stability, but its brittleness and low impact resistance. Carbon fiber as a reinforcement can effectively improve its mechanical properties and toughness. In order to better meet the application needs of advanced composite materials in the high-end field, Wuxi Zhishang New Materials successfully broke the original technical barriers through the self-developed continuous carbon fiber reinforced PPS woven composite board manufacturing technology, and became the carbon fiber thermoplastic material. The application provides a new solution.

Thermoplastic resins generally exhibit high melt viscosity, which makes it difficult to achieve sufficient infiltration between the resin matrix and the reinforcing fibers. Wuxi Zhishang New Materials uses powder impregnation to prepare CF/PPS woven composites, and then prepares continuous composites by compression molding. Carbon fiber reinforced polyphenylene sulfide composite sheet. In this process, in addition to the type and quality of the selected carbon fiber and polyphenylene sulfide raw materials, the number of layers, hot pressing temperature, hot pressing time, and resin content will also have a significant impact on the mechanical properties of the composite board. .

Factors affecting the performance and quality of woven composite panels:

(1) Laying: When preparing carbon fiber-reinforced PPS woven panels by molding, the corresponding layup thickness should be determined according to the mold size, that is, effective layup within the mold thickness range. In the specific thickness of the mold, as the number of layers increases, the porosity of the sheet becomes smaller, but when the number of layers exceeds a reasonable value, excess pressure will be generated and the resin will be lost, so that the carbon fiber cannot be completely infiltrated, which affects the laminate The overall mechanical performance, how to maintain a reasonable thickness requires accurate calculation and sufficient production experience to judge.

(2) Hot pressing: An increase in the hot pressing temperature will reduce the viscosity of the resin, making it easier for the resin to infiltrate the carbon fiber. However, when the temperature exceeds 330°C, PPS will be cross-linked. Proper cross-linking can improve the mechanical properties of the sheet. Excessive cross-linking will make PPS harder and brittle, thereby reducing the tensile strength of the sheet. On the contrary, excessive viscosity will hinder its full infiltration of carbon fiber.

(3) Resin content: In the production of woven carbon fiber reinforced PPS composite panels, the resin content must be maintained in a more appropriate range, and enough polyphenylene sulfide resin can fully infiltrate the carbon fiber, so that the layers are tightly spaced. Combine. Once the resin content is too much, it will hinder the load transfer and reduce the mechanical properties of the laminate. Therefore, Wuxi Zhishang New Materials has summarized the scientific resin/carbon fiber mass ratio through mass production practices to ensure that the composite sheet exhibits the best tensile strength and bending strength.

Judgment on the performance and quality of woven composite board:

Preliminary performance testing of carbon fiber reinforced PPS woven composite sheet can be carried out through fracture experiment and tensile experiment. Wuxi Zhishang New Material believes that if the fracture test did not cause the carbon fiber to peel off from the resin matrix and create a gap, it is found that the resin completely and evenly coats the carbon fiber, and there is basically no exposed carbon fiber, which indicates that there is a gap between the matrix and the reinforcement. It has good interface bonding; if the surface of the carbon fiber at the section of the sheet is very smooth, there is almost no residual resin adhesion, and there are a large number of gaps at the same time, this indicates that the infiltration failure is found; Some carbon fibers are exposed, which means that the resin's infiltration effect on carbon fibers is not ideal. Both of these conditions will greatly reduce the performance of carbon fiber reinforced PPS woven panels.

After the tensile test, if it can be observed that most of the carbon fiber surface adheres to the resin at the section of the sheet, and there is no resin enrichment phenomenon, the layer is tightly bonded to the layer, and there is no obvious delamination, which indicates that the resin is infiltrating the carbon fiber Better; if it is found that part of the carbon fiber is pulled out, the layers are separated, and most of the carbon fiber surface has very little resin, it means that the impregnation effect is poor. On the contrary, if the carbon fibers are coated with resin, but there is resin enrichment, the fracture will appear uneven, and such an interface will not be able to effectively transfer the load. Similarly, the performance of this composite sheet is also unqualified.