Polydopamine‐bridged synthesis of h‐BN@PDA@PbWO4 as multifunctional enhancers for γ‐shielding performance and thermal conductivity of neoprene composites

Abstract

AbstractIn order to solve the problem of poor thermal conductivity of polymer‐based radiation shielding composite materials, h‐BN@PDA@PbWO4 hybrid powders were prepared by combining h‐BN with high thermal conductivity and PbWO4 with γ shielding. With the assistance of polydopamine, PbWO4 particles were synthesized in situ on the h‐BN surface. The effects of h‐BN@PDA@PbWO4 on thermal conductivity, γ‐ray shielding, and mechanical properties of chloroprene rubber were studied. The results showed that the hybrid particles had better dispersibility than the pure mixing of h‐BN and PbWO4 in chloroprene rubber and significantly improved the thermal conductivity gamma‐ray shielding performance and mechanical properties of CR composites. When the filler content of the hybrid powder reaches 40 wt%, the thermal conductivity of the composite is about 3.16 times that of the pure CR. The γ shielding rates at 86.5 KeV and 105.3 KeV photon energies increase by 14.14% and 17.61% compared with the pure CR. Compared with pure CR, the tensile strength of the composites increased by 4.79 MPa, and the elongation at break decreased slightly. These were because h‐BN@PDA@PbWO4 shows had an excellent synergistic effect in CR substrate. The new kind of CR/h‐BN@PDA@PbWO4 composite can be used for thermal management and gamma shielding.