Mechanical, dielectric, and thermal properties of polyarylene ether nitrile and boron nitride nanosheets composites

Abstract

The thermal conductivity of polyarylene ether nitrile (PEN) is effectively improved by the incorporation of boron nitride nanosheet (BNNS). BNNS is obtained via sonication exfoliation of commercial available hexagonal boron nitride (h‐BN) microplatelets in N‐methylpyrrolidone solvent. The BNNS, which is in 1–3 layers, is characterized by Atomic Force Microscopy measurement, Transmission electron microscopy observation and Ultraviolet–visible (UV–Vis) spectrum. The BNNS is incorporated into the PEN matrix to fabricate BNNS/PEN nanocomposites by using the solution‐casting method. The micromorphologies, thermal, mechanical, dielectric, and thermal conductivity properties of the obtained BNNS/PEN nanocomposites are investigated in detail. Scanning electron microscopy observation shows that the BNNS is homogeneously dispersed in the PEN matrix. The obtained BNNS/PEN nanocomposites show good thermal stability as the glass transition temperatures and initial decomposition temperatures of them are higher than 200 and 490°C. The coefficients of thermal expansion decreases with the increasing of BNNS, and is as low as 0.33 µm/°C when 5.0 wt% of BNNS is incorporated. The thermal conductivity increases with 64% at 5.0 wt% content of BNNS. The incorporation of the BNNS makes these BNNS/PEN composites as potential candidates to be used at high temperature with small thermal deformation. POLYM. COMPOS., 39:E1598–E1605, 2018. © 2017 Society of Plastics Engineers

Mechanical and tribological properties of nanocomposites incorporated with two-dimensional materials

“…The strength and modulus of composites both increase with the increase in the 2D nanomaterial content [63]. At a higher volume content, 2D nanomaterials are prone to self-aggregation, resulting in the deterioration of the mechanical properties of the composite [41].…”

In situ preparation and properties of phthalonitrile resin/hexagonal boron nitride composites

“…The thermal conductivities of the composites reached 0.79 W (m·K) −1 with the loading of 50 wt% nano- h -BN, which was 3.6-fold as much as that of the neat phthalonitrile resin. Xiao et al 20 improved the thermal conductivity of polyarylene ether nitrile (PEN) by incorporating BN nanosheets (BNNSs). The thermal conductivity of BNNS/PEN nanocomposites reached 0.47 W (m·K) −1 at a 5.0 wt% content of BNNSs, with a 64% improvement compared to 0.29 W (m·K) −1 for pure PEN.…”

Fabrication and Enhanced Thermal Conductivity of Boron Nitride and Polyarylene Ether Nitrile Hybrids

“…Polyarylene ether nitrile (PEN), as a special kind of polymer engineering material, is widely used in the aerospace, automobile manufacturing, and electronic industry fields due to its excellent thermal stability, corrosion resistance, and mechanical properties [7,8,9]. In addition, since the PEN backbone contains a large number of cyano groups (-CN), it shows the following advantages: (1) the -CN exhibits a strong polarity which can promote the adsorption of the polymer on various placodes and enhance the dielectric constant of PEN; (2) the -CN at the molecular chain of PEN self-crosslinks at elevated temperature, thereby increasing the application temperature of PEN; (3) the -CN of PEN can react with other functional fillers, improving the interfacial compatibility between the matrix and the incorporated fillers [10,11,12,13]. However, like most polymer resins, the relatively poor heat dissipation and low thermal conductivity of PEN restrict its further application in areas like electronic packaging and heat exchange engineering, etc.…”

“…However, like most polymer resins, the relatively poor heat dissipation and low thermal conductivity of PEN restrict its further application in areas like electronic packaging and heat exchange engineering, etc. [12].…”

“…To further improve the thermal conductivity of PEN, chemical and/or physical modification of h-BN is essential [27,28,29]. Xiao et al [12] obtained about two atomic layers of BN nanosheets (BNNS) by ultrasonic peeling and then introduced them into PEN to obtain a composite with thermal conductivity of 0.45 W/(m·k). On the one hand, the high thermal conductivity is derived from the nanosheet BNNS, which is easier to vibrate (it has been reported that the thermal conductivity of BNNS can be as high as 700 W/(m·k) [30,31]); on the other hand, at the same mass of BN, the volume of BNNS is much larger than that of unstripped h-BN, so it is easier to form heat conduction channels in the composite.…”