Simultaneously enhancing the thermal conductivity and dielectric constant of BN/CF hybrid filled polypropylene/polystyrene composites via in situ reactive processing

Abstract

Thermal conductive and electrical insulating polymer composites are exerted a tremendous fascination on the field of thermal management. The effective utilization of fillers is indispensable to construct the thermal conductive pathway to fabricate high thermal conductive polymer composites. Herein, a facile approach involves selective localization of boron nitride (BN) and carbon fiber (CF) through in situ polymerization of styrene through reactive processing as well as double‐percolation structure design. These composites can be easily fabricated by blending the BN, CF with polystyrene during the polymerization of styrene monomer and secondary compounding with polypropylene (PP). The selective localization of BN and CF was observed by scanning electron microscope (SEM) characterization. The cocontinuous structure of PP/PS was also confirmed by SEM observation. The thermal conductivity values was promoted from 0.22 W/mk for PP/PS blends to 0.62 W/mk for the in situ reactive blending composites with 14.5 wt% BN and 18 wt% CF. Moreover, the dielectric properties were also higher than that of the simple melt blending composites. Therefore, the method we proposed provides a potentially feasible plan to design and prepare the thermal conductive and electrical insulating composites for thermal management applications.

Preparing Multifunctional High-Performance Cross-Linked Polybenzoxazole Aerogels from Polybenzoxazine

“…The dielectric constants of cPBO-15 and cPBO-20 were higher than that of cPBO-10 due to their decreased porosity. All cPBO aerogels had a lower dielectric constant than that of other high-performance polymers such as polyimide, , polystyrene, polyaryletherketone, , and polysiloxane . Also, the dielectric losses of cPBO and P­( o AI-a) aerogels­(Figure b) were very small; most of them were less than 0.06.…”

Impact of hybrid nanofillers on the structure and property of polypropylene/polystyrene composites based on elongation flow

“…Furthermore, the result can be concluded from the Table 2 that the T 5% and the T 50% were increased significantly compared with the PP70/PS30 blend, which indicated that the hybrid nanofillers had a nice enhancement on the thermal stability of the PP/PS blend. Jiang et al 35 investigated the stability of the BN/CF hybrid filled PP/PS composites. The result showed that higher thermal stability of BN/CF/PP/PS composites can be achieved, which was consistent with the result in this work.…”

“…The addition of clay degraded the mechanical properties of the blends due to the poor adhesion between the OMC and the PP matrix. Jiang et al 35 prepared the BN/CF hybrid filled PP/PS composites via in‐situ reactive processing and studied the morphology and properties of the composites. The results showed that the BN and CF were selectively localized in PS phase, the thermal conductivity and dielectric constant of the composites improved obviously compared with that of composites prepared by simple melt blending technique.…”

Wear resistant PEEK composites with great mechanical properties and high thermal conductivity synergized with carbon fibers and h‐BN nanosheets

“…Sangamesh et al 35 found that 1.5 wt% BN filled CF/epoxy resin (EP) showed the improvement of tensile modulus by 19.4% whereas the tensile strength improvement by 12.3% in comparison with those of unfilled composites. In addition, Jiang et al 36 showed that the thermal conductivity values was promoted from 0.22 W/(m·K) for polypropylene (PP)/polyethylene (PS) blends to 0.62 W/(m·K) with 14.5 wt% BN and 18 wt% CF. Obviously, the addition of h‐BN and CF will enhance the mechanical properties and thermal conductivity of the polymeric matrices.…”