Self-Assembly of Carbon Nanotubes and Boron Nitride via Electrostatic Interaction for Epoxy Composites of High Thermal Conductivity and Electrical Resistivity

Lightweight Porous Polystyrene with High Thermal Conductivity by Constructing 3D Interconnected Network of Boron Nitride Nanosheets

“…At a temperature near T g , the dipoles begin to have enough mobility to contribute to the loss and ε. 44 Figure 7c,d shows the effective relative ε and loss versus temperature of the 20 wt % BNNSs/c-PS composites with various VEs. With the increase of VE, all the composites exhibit an obvious decrease in ε and loss.…”

“…Phonon propagations are significantly hindered and suppressed because of phonon scattering at the interfacial boundary between the filler and the matrix, thereby leading to low TC. 1,[43][44][45][46][47] For the foamed polymer composites, apparently, due to the biaxial flow of materials during the foaming process, the BNNSs probably either turn their face fixed face orientation, or are aligned along the flow direction of materials, i.e., along the cell…”

“…8,12,[36][37][38][39][40][41][42] Other strategies include electric or magnetic field induced filler alignment, ultra-drawing, frozen-drying, and ultra-sonication, etc. [43][44][45][46][47][48][49] Up to now, extensive investigations on the preparation of heat conductive composites have been carried out on solid polymer matrix. 1,5,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] The porous polymers with low densities and reduced weights, although they are promising for applications that are sensitive to weights such as aeronautics and astronautics, have received much less attention due to their extremely low TC as a result of introduced air (i.e.…”

“…When the TC ratio of the filler to the polymer exceeds 1000, further increasing the TC of the filler has negligible effect on the effective TC of the composites . Therefore, the inclusion of a carbon nanotube (CNT) or graphene flake with extremely high TC in polymers failed to remarkably increase the TC of the polymers owing to the large thermal interfacial resistance resulting from the significant phonon scattering at the interfaces − due to the unpaired phonon frequency. ,,,,− In order to circumvent this challenge and decrease the thermal interfacial resistance, a three-dimensional (3D) network of fillers in the matrix has recently been developed. ,,− Other strategies include electric or magnetic field induced filler alignment, ultradrawing, freeze-drying, ultrasonication, etc. − …”

Effect of aspect ratio of vertically aligned copper nanowires in the presence of cellulose nanofibers on the thermal conductivity of epoxy composites

“…[6][7][8] In general, the thermally conductive composites are prepared by a random dispersion of the fillers in polymer matrix and the composites require a high filler loading to reach a high thermal conductivity. [9][10][11] However, the high filler loading leads to a deterioration of mechanical properties, the difficulty of processing, and heavyweight. [12][13][14] In addition, the randomly dispersed fillers may not form an efficient heat transfer pathways and lead to low thermal conductivity.…”