The Research Of Effect Of High Thermal Conductive Filling System On Structure And Property Of Resin-Based Composites

PPS has excellent thermal stability, chemical stability, mechanical properties and electrical insulating properties, etc. It can be used as a matrix of high performance thermoplastic composites applied in many fields, such as electronic electric, automobile, chemical industry, precision machinery and aviation, aerospace and other fields.This experiment use PPS as matrix, mesophase pitch-based carbon fiber as reinforcing material. Study the influence with different carbon fiber, carbon fiber content and the early stage of the carbon fiber processing on structure and properties of PPS matrix composites. Analysis the material microstructure by XRD, SEM, TEM, and test the mechanical properties and thermal properties of the composite material. Carbon fiber tilled composites prepared by intermittent process has better performance than of the that of Carbon fiber filled composites prepared by continuous process, however their microstructure is almost the same.Different carbon fiber content has different effect on the properties of the composites. With the increase of carbon fiber content, the mechanical property will decrease, while thermal conductivity will increase. The composite with5%fiber content has the highest tensile strength of45.17Mpa, while the composite with20%fiber content has the lowest tensile strength of30.57Mpa. The composite with5%fiber content has the highest bending strength of82.24Mpa, while the composite with20%fiber content has the lowest bending strength of69.36Mpa. The composite with5%fiber content has the lowest thermal conductivity of0.82W/m·k, while the composite with20%fiber content has the highest of thermal conductivity of1.88W/m·k.Different early processing stage of carbon fibers has different effects on composite material. The CFRP soaked in acetone has an excellent mechanical performance, but the thermal conductivity is low, while the high-temperature treatment has no obviously effect on CFRP. The tensile strength of CFRP soaked in acetone is42.75Mpa, the bending strength is83.34Mpa, and the thermal conductivity is1.13W/m·k. The tensile strength of CFRP with high-temperature treatment is78.36Mpa, the bending strength is83.34Mpa, and the thermal conductivity is1.22W/m·k. Through the microstructure analysis we find that acetone treatment can improve the mechanical properties of carbon fiber by enhance interface binding energy, reducing carbon fiber peeling off and pull away from the collective phenomena. While high-temperature treatment, has no obvious effect on the performance and structure of the composites.