The EP resin (the purity of> 95 wt%) were purchased from Nantong Xingchen Synthetic Material Co. Ltd. The isophorone diamine (analytical pure) was purchased from Shanghai McLean Biochemical Technology Co., Ltd. The raw materials to prepare S-MoS2 are sodium molybdate and ammonium thiourea (the purity was > 98%, purchased from Jingzhou fine chemical co., Ltd). The TiO2 powder was purchased laboratory-made via bydrothermal method. The other reagents and solvents used in the experiments including: sodium dodecyl sulfate, hydrazine hydrate, chlorhydric acid, ethanol, and acetic acid, which were supplied by Tianjin Fuchen Chemical Reagents Factory without further purification.
2.2 Preparation of the S-MoS2/HNS
The S-MoS2 was prepared by hydrothermal method. 0.484 g sodium molybdenate, and 0.364 g thiourea were added into the autoclave with polytetrafluoroethylene substrates, while 20 mL sodium dodecyl sulfate solution (which concentration is 0.016 mol/L) and 1g TiO2 are also added into the autoclave. The autoclave was put into a high-pressure steam, 220℃ for 24 h. The autoclave was then cool to room temperature, and the mixture was purred out. The mixture was cleaned by deionized water and anhydrous ethanol for 5 times, and the then dried at 50 ℃ for 12 h in a vacuum. The products S-MoS2 were finally obtained after calcined at 500 ℃.
2.3 Preparation of the S-MoS2/EP composites
The S-MoS2/EP composites were prepared via a casting method, and the preparation process is shown in figure 1. The EP were stirred in a glass beaker with isophorone diamine at 40 °C, and S-MoS2 (the mass ratio is 0.0 wt%, 1.0 wt%, 2.0 wt%, 3.0 wt%, 4.0 wt%, and 5.0 wt%) were added into the EP, respectively. These mixtures were ultrasonic dispersed for 15 mins to obtain the well-dispersed matrix. The matrixes were then stirring under 40 ℃ until the pre-polymer completely dissolved, and the pre-polymer was poured into a pre-heated mould with a release agent and degassed at 50 °C for about 30 mins in a vacuum drying oven. Finally, the mould with pre-polymer was put into a blast drying oven, and the cured process is 80 °C/1 h + 100 °C/1 h + 120 °C/2 h.
The X-ray diffraction (XRD)
The X-ray diffraction (Bruker D8, Germany) was chosen to research the crystal structure of S-MoS2 at room temperature.
Scanning electron microscopy (SEM)
The S-3400NⅡ scanning electron microscope (HITACHI, Japan) was chosen to observe the morphology of S-MoS2, and the surface morphology of the fractured surface of the EP and S-MoS2/EP samples at room temperature.
The dielectric properties of EP and S-MoS2/EP samples were measured by dielectric constant dielectric loss tester (ZJD-A type, China Aviation Times Company).
The thermal conductivity were measured by transient fast hot wire method of thermal conductivity tester (KDRX-Ⅱ, Xiangtan Xiangyi Instrument Co., Ltd, China).
Thermal resistant properties
The thermogravimetric analysis (TGA) was determined by a TGAQ50 in a nitrogen atmosphere, the heating rate is 20 °C min-1.
The differential Scanning Calorimeter (DSC) was determined by a DSC-2910 in a nitrogen atmosphere, the heating rate is 15 °C min-1.