Thermally conductive and mechanically strengthened bio‐epoxy/boron nitride nanocomposites: The effects of particle size, shape, and combination

Abstract

Bio-epoxy composites containing boron nitride (BN) particles with different size and shape (0D spherical micro-and nanoparticles, 1D nanotubes (T), and 2D nanosheets (S)) are prepared and revealed appropriate thermal conductivity, thermal stability, and mechanical properties. Systems containing one or two BN nanoparticles showed evenly dispersed structures because of applying high-shear, ultrasonic, or combination of these methods. Microscopic analysis proved that high-shear assisted ultrasonic technique ended up in an homogeneously dispersed BN nanoparticles in the epoxy matrix. The combination of platelet-like and tubular nanoparticles synergistically enhanced both the thermal stability and thermal conductivity of epoxy. Differential scanning calorimetry (DSC) thermographs appeared a sharp peak demonstrating excessive thermal energy released because of network formation of BN conductive fillers. The bi-oepoxy containing equal weight fractions of T and S (1:1 w/w ratio) showed the highest thermal conductivity and tensile strength values of 2.21 W/m.K and 80 MPa, respectively. In conclusion, properties of epoxy nanocomposites are affected by the filler network formation, such that conductive incorporation of 3 wt.% of BN platelet-like and nanotubes increased thermal conductivity up to 1400% and mechanical properties up to 50% with respect to the neat epoxy.

From two‐dimensional materials to polymer nanocomposites with emerging multifunctional applications: A critical review

“…One of the significant material classes with several uses is h‐BN/polymer composites, [ 66–74 ] encompassing fields like health care and medicine, [ 75,76 ] energy storage, [ 77,78 ] electronic engineering, [ 79 ] and the mobility sector (automotive [ 80 ] and aerospace). [ 81 ] While graphene/polymer nanocomposites have received a lot of attention, less focus has been placed on h‐BN/polymer composites.…”

“…In spite of that, its layers are stacked by weaker van der Wall's forces and Lip-Lip bonds, with boron and nitrogen atoms positioned above and below one another in neighboring layers. [63][64][65] One of the significant material classes with several uses is h-BN/polymer composites, [66][67][68][69][70][71][72][73][74] encompassing fields like health care and medicine, [75,76] energy storage, [77,78] electronic engineering, [79] and the mobility sector (automotive [80] and aerospace). [81] While graphene/polymer nanocomposites have received a lot of attention, less focus has been placed on h-BN/polymer composites.…”

Boron Nitride Microspheres via Pyrolysis of Polymerized Precursors

“… 2 , 3 The BN spheres can easily achieve a well-uniform and highly dense filling within polymeric composites, thereby greatly enhancing the composite’s mechanical and thermal properties. 4 − 6 Thus, it is of great significance to develop reliable large-scale preparation of spherical BN for ameliorating the performance of h-BN-based ceramics and BN-filled polymer composites.…”

“…A spherical boron nitride (BN) has better fluidity than its natural sheetlike morphology . The use of spherical BN can improve the forming density of hexagonal boron nitride (h-BN) ceramics and enhance the mass transfer efficiency in a sintering process. , The BN spheres can easily achieve a well-uniform and highly dense filling within polymeric composites, thereby greatly enhancing the composite’s mechanical and thermal properties. − Thus, it is of great significance to develop reliable large-scale preparation of spherical BN for ameliorating the performance of h-BN-based ceramics and BN-filled polymer composites.…”

Modeling effective elastic and thermal conductivity of composite materials reinforced with plastic waste: Analytical and numerical approaches

“…[5] These properties are enhanced by the dispersion method of the filler within the matrix, the bonding type between the filler and matrix, as well as the size and shape of the filler particles. [6,7] The high homogeneity and strong interfaces between the filler and matrix lead to better load transfer and resistance to crack propagation, resulting in improved mechanical properties. [8][9][10][11][12] The thermal conductivity and stability of nanocomposites are influenced by the type of filler and its size and distribution.…”