Fabrication of Carbon Fiber Reinforced Aromatic Polyamide Composites and Their Thermal Conductivities with a h-BN Filler

Abstract

In this study, a carbon fiber-reinforced thermoplastic composite was fabricated using a new aromatic polyamide (APA) as a matrix. Non-isothermal crystallization behaviors in the cooling process of APA resin (a semi-crystalline polymer) and composite were analyzed by using a differential scanning calorimeter (DSC). To determine the optimum molding conditions, processing parameters such as the molding temperature and time were varied during compression molding of the Carbon/APA composite. The tensile and flexural properties and morphologies of the fabricated composites were analyzed. Molding at 270 °C and 50 MPa for 5 min. showed relatively good mechanical properties and morphologies; thus, this condition was selected as the optimal molding condition. In addition, to enhance the thermal conductivity of the Carbon/APA composite, a study was conducted to add hexagonal boron nitride (h-BN) as a filler. The surface of h-BN was oxidized to increase its miscibility in the resin, which resulted in better dispersity in the APA matrix. In conclusion, a Carbon/APA (h-BN) composite manufactured under optimal molding conditions with an APA resin containing surface-treated h-BN showed a thermal conductivity more than twice that of the case without h-BN.

Non-Isothermal Crystallization Kinetics of Montmorillonite/Polyamide 610 Nanocomposites

“…(3) The heated 220-240 • C, and the pressure was maintained at 1.9-2.5 Mpa for 2.5-3 h. (4) The reactor temperature was increased to 240-255 • C while the reactor pressure was gradually released to atmosphere pressure for 1-1.5 h. (5) The temperature of the reactor was further increased to 260-270 • C for 20-30 min at atmospheric pressure. (6) Once the temperature of the reactor reached 270-280 • C, the stirred reactor was evacuated to produce a pressure of 0.008-0.01 Mpa for 10-30 min. Stirring was stopped once the torque of the stirring paddle reached 2.5-3 Nm, and the resultant composites were obtained.…”

“…After the inclusion of this correction, the Avrami equation can be represented as Equation (6), which enables the apparent Avrami index n and crystallization rate parameters Z and Z c to be calculated.…”

Impact of Thermal Properties on Crystalline Structure, Polymorphism and Morphology of Polymer Matrices in Composites

“…Indeed, heat exchange between two components is controlled by contact resistances, which increase with increasing the amount of air trapped at the interface. For instance, Lee et al obtained a highly thermal conductive composite by stacking a carbon fiber/aromatic polyamide unidirectional prepreg [ 87 ]. The authors investigated the thermal behavior of the long fiber composite by DSC and, since the adhesion between the components was only relatively good, the composite showed a delayed crystallization peak by continuous cooling from melt, notwithstanding the high conductivity of the prepreg.…”

Data‐Driven Design of Electrically Conductive Nanocomposite Materials: A Case Study of Acrylonitrile–Butadiene–Styrene/Carbon Nanotube Binary Composites

“…[1][2][3][4] Conventional polymers or plastics are electrically insulated. The most feasible way of achieving electrical conductivity in polymer matrices is to introduce conducting fillers into the insulating polymer, [5][6][7][8][9][10] such as metal powders, amorphous carbon materials, conjugated conducting polymers, carbon fibers, and carbon nanotubes (CNTs). Among these, CNTs are of great interest owing to their unique physical and chemical properties, particularly superior electrical conductivity compared with other conducting fillers.…”