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

Abstract

Phthalonitrile resin/exfoliated hexagonal boron nitride ( h-BN) composites with high thermal conductivity were fabricated using a novel approach. The route included two steps, micro- h-BN was coated and dispersed by phthalonitrile monomers via the function of heterogeneous nucleation, and then micro- h-BN was exfoliated by heat release during the phthalonitrile curing process. The composites achieved a high thermal conductivity of 0.736W (m·K)−1 containing 20 wt% micro- h-BN, which is 3.17 times higher than that of pure phthalonitrile resin at 0.232W (m·K)−1. Compared to traditional routes, the novel preparation approach requires less BN fillers when improving the same thermal conductivity. Importantly, other thermosetting polymers can also encapsulate BN through this strategy, which paves a new way for preparing thermally conductive thermosetting polymer–matrix composites.

Water-soluble polyvinyl alcohol composite films with nanodiamond particles modified with polyethyleneimine

“…The addition of NDs and other nano-fillers can improve the mechanical properties of the polymer matrix, but if the nano-fillers are overfilled, the mechanical properties of the film will also be damaged. 27,54 Considering their practical application, it is necessary to study the mechanical properties of PVA composite films under different packing loads.…”

Preparation and characterization of a high heat resistant phthalonitrile resin modified by polyborosilazane ceramic precursor

“…The more commonly employed inorganic elements are boron (B), silicon (Si), phosphorus (P) and sulfur (S), etc. 13,14 For example, a novel silicon-containing phthalonitrile monomer (SiBPPN) was successfully designed and synthesized. The results showed that the char yield (C y ) of SiBPPN is 81.5% (at 800 C) and 5% weight loss temperatures (T d5% ) is 546 C under the nitrogen atmosphere.…”

“…Researchers worked for quite a few years on improving the heat‐resistance performance of phthalonitrile under high temperatures, and lots of effective methods are proposed. Organic–inorganic hybridization is considered a method to enhance the heat‐resistance of polymeric materials and make them withstand more extreme temperatures 10–12 . One approach is to combine organic structure with inorganic elements forming an organic–inorganic hybrid structure.…”

“…Moreover, the number of chemical groups is limited, so the content of inorganic elements introduced is restricted. Another approach is that inorganic particles (BN, SiO 2 , Al 2 O 3 ) within a high melting point are introduced into the polymer‐based matrix to improve the heat‐resistance of the polymer‐based material 12,20,21 . The thermal performance of the resin is improved by isolating or reducing the direct contact of high‐temperature gases with the polymer‐based matrix.…”

Effect of highly thermally conductive Ag@BN on the thermal and mechanical properties of phthalonitrile resins

“…Among these materials, hexagonal boron nitride (BN) is an ideal thermally conductive filler because of its low weight, excellent electrical insulation, high chemical stability, and high thermal conductivity. [14][15][16] However, BN is not highly compatible with the polymer and disperses unevenly in the matrix, thereby deteriorating the thermal conductivity of the composites. 17 To enhance the dispersibility and compatibility of BN in polymers and achieve a higher filling amount, it is necessary to modify the surface of BN.…”